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Critical load position for cavities beneath CRCP slab under vehicle loading 被引量:2
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作者 陈小兵 赵蓉龙 +2 位作者 童金虎 黄晓明 罗瑞林 《Journal of Southeast University(English Edition)》 EI CAS 2016年第1期78-84,共7页
In order to study the critical load position that causes cavities beneath the continuously reinforced concrete pavement( CRCP) slab under vehicle loading, the elliptical load is translated into the square load based... In order to study the critical load position that causes cavities beneath the continuously reinforced concrete pavement( CRCP) slab under vehicle loading, the elliptical load is translated into the square load based on the equivalence principle.The CRCP slab is analyzed to determine the cavity position beneath the slab under vehicle loading. The influences of cavity size on the CRCP slab's stress and vertical displacement are investigated. The study results showthat the formation of the cavity is unavoidable under traffic loading, and the cavity is located at the edge of the longitudinal crack and the slab corner.The cavity size exerts an obvious influence on the largest horizontal tensile stress and vertical displacement. The slab corner is the critical load position of the CRCP slab. The results can be used to assist the design of CRCP in avoiding cavities beneath slabs subject to vehicle loading. 展开更多
关键词 vehicle loading CAVITY continuously reinforced concrete pavement(CRCP) critical load position finite element method(FEM)
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Acid deposition critical loads modeling for the simulation of sulfur exceedance and reduction in Guangdong, China 被引量:3
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作者 QIU Rongliang WANG Shizhong +3 位作者 QIU Hao WANG Xuemei LIAO Jin ZHANG Zhentian 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第8期1108-1117,共10页
The current acid deposition critical loads in Guangdong, China were calculated using the PROFILE model with a 3 km × 3 km resolution. Calculations were carded out for critical loads of potential acidity, actual a... The current acid deposition critical loads in Guangdong, China were calculated using the PROFILE model with a 3 km × 3 km resolution. Calculations were carded out for critical loads of potential acidity, actual acidity, sulfur and nitrogen, with values in extents of 0-3.5, 0-14.0, 0-26.0 and 0-3.5 kmol/(hrnE.year), respectively. These values were comparable to previously reported results and reflected the influences of vegetation and soil characteristics on the soil acid buffering capacity. Simulations of SO2 emission and sulfur deposition in this study showed that sulfur deposition core areas mirrored SO2 emission centers. The prediction of sulfur deposition after 20% and 40% reduction of SO2 emission suggested that the reduction of area sources contributed greatly to the decrease of sulfur deposition. Thus, abatement of area source emissions could be the primary way to mitigate sulfur deposition in Guangdong to meet both the provincial and national regulations of air pollution control. 展开更多
关键词 acid deposition critical loads MODELING SO2 reduction sulfur deposition exceedance and reduction
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A method for predicting critical load evaluating adhesion of coatings in scratch testing 被引量:1
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作者 陈溪芳 严密 +1 位作者 杨德人 HIROSEYukio 《Journal of Zhejiang University Science》 CSCD 2003年第6期709-713,共5页
In this paper based on the experiment principle of evaluating adhesion property by scratch testing, the peeling mechanism of thin films is discussed by applying contact theory and surface physics theory. A mathematica... In this paper based on the experiment principle of evaluating adhesion property by scratch testing, the peeling mechanism of thin films is discussed by applying contact theory and surface physics theory. A mathematical model predicting the critical load is proposed for calculating critical load as determined byscratch testing. The factors for correctly evaluating adhesion of coatings according to the experimental data arediscussed. 展开更多
关键词 COATING ADHESION Scratch testing critical load prediction
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Critical load of sulfur deposition for ecosystemand its application in China 被引量:1
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作者 Zhao Dianwu Zhang Xiaoshan Yang Jianxin(Research Center for Eco-Environrnental Sciences , Chinese Academy of Sceiences, Beijing 100085, China)Mao Jietai(Department of Geophysics, Peking University. Beijing 100871 . China)Xiong Jiling(Guizhou Institute o 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 1995年第3期325-337,共13页
CriticalloadofsulfurdepositionforecosystemanditsapplicationinChinaZhaoDianwu;ZhangXiaoshan;YangJianxin(Resea... CriticalloadofsulfurdepositionforecosystemanditsapplicationinChinaZhaoDianwu;ZhangXiaoshan;YangJianxin(ResearchCenterforEco-E... 展开更多
关键词 sulfur deposition critical load : ecosystem.
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A New Proximity Indicator for Assessment of Voltage Stability and Critical Loadability Point
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作者 Chandrakant Dondariya D.K.Sakravdia 《Energy Engineering》 EI 2022年第3期947-963,共17页
This paper presents a newly developed proximity indicator for voltage stability assessment which can be used to predict critical real system load and voltages at various load buses at critical loading point.The proxim... This paper presents a newly developed proximity indicator for voltage stability assessment which can be used to predict critical real system load and voltages at various load buses at critical loading point.The proximity indicator varies almost parabolic with total real load demand and reaches orthogonally to real load axis.This relation has been utilized to predict critical loading point.It has been shown that two operating points are needed for estimating critical point and proper selection of operating points and variation of proximity indicator near collapse point highly affect the accuracy of estimation.Simulation is based on load flow equations and system real and reactive loadings have been increased in proportion with base case scenario for IEEE 14 and IEEE 25 bus test systems to demonstrate the behaviour of proposed proximity indicator.CPF has been used as benchmark to check the accuracy of estimation. 展开更多
关键词 Voltage stability voltage collapse proximity indicator critical loading CPF
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DISCUSSION OF CRITICAL LOAD IN NONLINEAR STABILITY ANALYSIS AND SUGGESTION OF VARIATIONAL PRINCIPLE OF SOLVING CRITICAL LOADS
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作者 李龙元 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1990年第3期293-295,共3页
In this paper, a set of variational formulas of solving nonlinear instability critical loads are established from the viewpoint of variational principle. The paper shows that it is very convenient to solve nonlinear i... In this paper, a set of variational formulas of solving nonlinear instability critical loads are established from the viewpoint of variational principle. The paper shows that it is very convenient to solve nonlinear instability critical load by using the variational formulas suggested in this paper. 展开更多
关键词 MODE DISCUSSION OF critical load IN NONLINEAR STABILITY ANALYSIS AND SUGGESTION OF VARIATIONAL PRINCIPLE OF SOLVING critical loadS
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Analysis of Critical Load of the Orthotropic Plate Structures
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作者 Radoljub Tomic Predrag Petrovic Tomlslav Jovanova 《Journal of Mechanics Engineering and Automation》 2012年第1期37-40,共4页
Advanced design based on the concept of orthotropic structure includes better use of materials, less weight compared to the equivalent isotropic construction and controlled effectively reserve resistance in all its se... Advanced design based on the concept of orthotropic structure includes better use of materials, less weight compared to the equivalent isotropic construction and controlled effectively reserve resistance in all its segments. In this case a calculation of critical load is exposed using the FDM (Finite Difference Method) concept of thin plates subjected to complex loads due to forces in the middle-plane. Results of calculation model, discussed in this paper, are given in graphic form. Presented results should serve as an indicator of the expansion of theoretical base of similar models, which can be reasonably use by researchers and engineers in their practices, and by students for educational purposes. 展开更多
关键词 PLATE orthotropic material analysis of critical load finite difference method structure.
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Centralized multi-agent implementation for securing critical loads in PV based microgrid 被引量:10
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作者 A.SUJIL Saurabh Kumar AGARWAL Rajesh KUMAR 《Journal of Modern Power Systems and Clean Energy》 SCIE EI 2014年第1期77-86,共10页
The promotion of recent critical load securing of power system research has been directed towards centralized commands and control functions.This paper presents a multi-agent based critical load securing in a PV based... The promotion of recent critical load securing of power system research has been directed towards centralized commands and control functions.This paper presents a multi-agent based critical load securing in a PV based microgrid.For the trustworthy operation of critical buildings,the reliability,efficiency and security of the power system should be guaranteed.At present,to increase the security and reliability of electricity supply there is a need to design a distributed and autonomous subset of a larger grid or a microgrid.This work also clearly discusses the modelling and simulation of specialized microgrid called an Intelligent Distributed Autonomous Power Systems(IDAPS).The IDAPS microgrid plays a crucial role in constructing power grid that facilitate use of renewable energy technologies.IDAPS microgrid comprising of solar photovoltaic as distributed energy resources,different loads and their control algorithms,has been developed.Several case studies have been simulated to evaluate the operation of the IDAPS microgrid during parallel,islanded mode operation and securing critical loads during emergency. 展开更多
关键词 MICROGRID Multi-agent system(MAS) critical load securing Distributed energy resources
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Mapping Critical Loads of Acid Deposition for Soils in China 被引量:1
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作者 段雷 郝吉明 +3 位作者 Alan Jenkins' Rob Collins Chris Evans 谢绍东 《Tsinghua Science and Technology》 EI CAS 2000年第3期270-278,共9页
A method described is to produce critical load maps of acid deposition for soils in China. Critical loads were assigned to the most sensitive soil in each 0.1°×0.1° grid square of China based on the Sko... A method described is to produce critical load maps of acid deposition for soils in China. Critical loads were assigned to the most sensitive soil in each 0.1°×0.1° grid square of China based on the Skokloster classification [1] and adjusted for temperature and land use. The map shows that soils with small critical load (<0.5keq·ha -1 ·a -1 ) i.e., highly sensitive to acid deposition, dominate in the south and northeast China. As a result of the adjustment, much of the acid sensitive area in the south estimated by the Skokloster method is lost. This reflects the decreased sensitivity as a result of agricultural activities and increased weathering rate in response to high temperature. Based on the 0.1°×0.1° map, a series of percentile critical load maps at 1°×1° scale were compiled for integrated assessments, as well as a critical load map using the minimum critical load for each grid. Comparison of critical loads with sulphur deposition in 1995 led to the critical load exceedance maps for sulphur deposition, which show that high exceedance areas do not correlate well with the low critical load areas, and almost one fourth of the land area, mainly in the southeast, is subject to the risk of acidification. 展开更多
关键词 critical load acid deposition soil sensitivity
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THE INFLUENCE OF IMPERFECTIONS UPON THE CRITICAL LOAD OF STRUCTURES
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作者 朱正佑 丛玉豪 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1999年第10期1108-1115,共8页
By means of the theory of universal unfolding, the influence of multi-imperfections upon the critical load of structure in engineering is analysed in this paper. For the pitchfork problem, a lower bound of increments ... By means of the theory of universal unfolding, the influence of multi-imperfections upon the critical load of structure in engineering is analysed in this paper. For the pitchfork problem, a lower bound of increments of the critical loads caused by imperfections of the structures is given. A simple and available numerical method for computing the lower bound is described. 展开更多
关键词 IMPERFECTIONS critical load pitchfork universal unfolding
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THE SOLUTION TO THE DESTABILIZING CRITICAL LOAD OF CIRCULAR DOUBLE ARTICULATED ARCH UNDER GOING VERTICAL DISTRIBUTIVE LOAD g_0/cos^2θ
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作者 潘岳 戚云松 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1999年第5期73-82,共10页
In this paper, after taking th e effect of axis force on bending into consideration, the general potential ener gy for the circular double articulated arch is established undergoing vertical d istributive load g 0/... In this paper, after taking th e effect of axis force on bending into consideration, the general potential ener gy for the circular double articulated arch is established undergoing vertical d istributive load g 0/ cos 2θ . With sufficient engineering precision, the fourth approximations to the destabilizing critical load of the arch under t his load are obtained by Ritz method. The approximations to the critical load ta ble are listed for various center angles of arch, and are contrasted with the cr itical load circular arch undergoing radial uniform load. Some reference results have been obtained. 展开更多
关键词 circle arch vertical distributi ve load in g 0/ cos destabilizing critical load
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Atmospheric Sulfur and Nitrogen Deposition in Five Nature Reserves of Sichuan Basin to Qinghai-Tibetan Plateau Transect Region,Southwest-ern China
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作者 XU Zhongjun SHU Xi +5 位作者 YANG Han FU Liqiang LIU Tingting XIA Zhonglin QIAO Xue TANG Ya 《Chinese Geographical Science》 SCIE CSCD 2024年第6期1060-1072,共13页
Enhanced sulfur and nitrogen deposition has been observed in many transect regions worldwide,from urban/agricultural areas to mountains.The Sichuan Basin(SCB),with 18 prefectural cities,is the most economically-develo... Enhanced sulfur and nitrogen deposition has been observed in many transect regions worldwide,from urban/agricultural areas to mountains.The Sichuan Basin(SCB),with 18 prefectural cities,is the most economically-developed region in western China,while the rural Qinghai-Tibetan Plateau(QTP)lies west of the SCB.Previous regional and national atmospheric modeling studies have sug-gested that large areas in the SCB-to-QTP transect region experience excessive deposition of sulfur and nitrogen.In this study,we ap-plied a passive monitoring method at 1l sites(one in urban Chengdu and 10 from fivenature reserves)in this transect region from September 2021 to October 2022 to confirm the high sulfur and nitrogen deposition fluxes and to understand the gaps between the mod-eling and observation results for this transect region.These observations suggest that the five reserves are under eutrophication risk,and only two reserves are partially under acidification risk.Owing to the complex topography and landscapes,both sulfur and nitrogen de-position and critical loads exhibit large spatial variations within a reserve,such as Mount Emei.Regional atmospheric modeling may not accurately capture the spatial variations in deposition fluxes within a reserve;however,it can capture general spatial patterns over the entire transect.This study demonstrates that a combination of state-of-the-art atmospheric chemical models and low-cost monitoring methods is helpful for ecological risk assessments at a regional scale. 展开更多
关键词 acid deposition ion exchange resin critical load ACIDIFICATION EUTROPHICATION Sichuan Basin to Qinghai-Tibetan Plateau transect region China
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Dynamical response of hyper-elastic cylindrical shells under periodic load 被引量:2
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作者 任九生 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2008年第10期1319-1327,共9页
Dynamical responses, such as motion and destruction of hyper-elastic cylindrical shells subject to periodic or suddenly applied constant load on the inner surface, are studied within a framework of finite elasto-dynam... Dynamical responses, such as motion and destruction of hyper-elastic cylindrical shells subject to periodic or suddenly applied constant load on the inner surface, are studied within a framework of finite elasto-dynamics. By numerical computation and dynamic qualitative analysis of the nonlinear differential equation, it is shown that there exists a certain critical value for the internal load describing motion of the inner surface of the shell. Motion of the shell is nonlinear periodic or quasi-periodic oscillation when the average load of the periodic load or the constant load is less than its critical value. However, the shell will be destroyed when the load exceeds the critical value. Solution to the static equilibrium problem is a fixed point for the dynamical response of the corresponding system under a suddenly applied constant load. The property of fixed point is related to the property of the dynamical solution and motion of the shell. The effects of thickness and load parameters on the critical value and oscillation of the shell are discussed. 展开更多
关键词 hyper-elastic cylindrical shells nonlinear differential equation periodic oscillation quasi-periodic oscillation critical load
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Analytic Solution of Elasto-Plastic Stress in Infinite Slope under Uniform Load 被引量:1
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作者 Wang, NX Gu, L 《China Ocean Engineering》 SCIE EI 1999年第2期197-208,共12页
According to the Mohr-Coulomb yield criterion, the stress field of the infinite slope is derived under a vertical uniform load q on the top of the slope. It is indicated that elastic and elasto-plastic states would oc... According to the Mohr-Coulomb yield criterion, the stress field of the infinite slope is derived under a vertical uniform load q on the top of the slope. It is indicated that elastic and elasto-plastic states would occur in the slope. When q is smaller than the critical load, q(p), the slope is in the elastic state. If q equals q(p), the slope is in the critical state, and the plastic deformation would occur along the critical angle. With the increase of q, the plastic zone would extend, and the slope is in the elasto-plastic State. If q equals limit load, the slope is in the limit equilibrium state. The slope may be divided into three zones. Some charts of the critical angle, the critical and limit load coefficients are presented in this paper. 展开更多
关键词 elasto-plastic stress critical load limit load infinite slope uniform load
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NONLINEAR VIBRATION OF CIRCULAR SANDWICH PLATES UNDER CIRCUMJACENT LOAD
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作者 杜国君 马建青 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2006年第10期1417-1424,共8页
Based on von Karman plate theory, the issue about nonlinear vibration for circular sandwich plates under circumjacent load with the loosely clamped boundary condition was researched. Nonlinear differential eigenvalue ... Based on von Karman plate theory, the issue about nonlinear vibration for circular sandwich plates under circumjacent load with the loosely clamped boundary condition was researched. Nonlinear differential eigenvalue equations and boundary conditions of the problem were formulated by variational method and then their exact static solution can be got. The solution was derived by modified iteration method, so the analytic relations between amplitude and nonlinear oscillating frequency for circular sandwich plates were obtained. When circumjacent load makes the lowest natural frequency zero, critical load is obtained. 展开更多
关键词 sandwich plate nonlinear vibration critical load BUCKLING amplitude frequency-load characteristic relation
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Finding the buckling load of non-uniform columns using the iteration perturbation method
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作者 Aref Afsharfard Anooshiravan Farshidianfar 《Theoretical & Applied Mechanics Letters》 CAS 2014年第4期59-64,共6页
The aim of this study is to calculate the critical load of variable inertia columns. The example studied in this paper can be used as a paradigm for other non-uniform columns. The wavelength of equivalent vibratory sy... The aim of this study is to calculate the critical load of variable inertia columns. The example studied in this paper can be used as a paradigm for other non-uniform columns. The wavelength of equivalent vibratory system is used to calculate the critical load of the trigonometrically varied inertia column. In doing so, the equilibrium equation of the column is theoretically studied using the perturbation method. Accuracy of the calculated results is evaluated by comparing the solution with numerical results. Effect of improving the initial guess on the solution accuracy is investigated. Effects of varying parameters of the trigonometrically varied inertia and the uniformly tapered columns on their stability behavior are studied. Finally, using the so-called "perfectibility" parameter, two design goals, i.e., being lightweight and being strong, are studied for the discussed columns. 展开更多
关键词 perturbation method critical load non-uniform column perfectibility
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Service Life Prediction of Lining Concrete of Subsea Tunnel under Combined Compressive Load and Carbonation 被引量:2
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作者 陈静茹 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第6期1061-1064,共4页
Qingdao Jiaozhou Bay subsea tunnel is the second self-built tunnel in China with the designed service life over 100 years.The durability of lining concrete are one of an important factors to determinate the service li... Qingdao Jiaozhou Bay subsea tunnel is the second self-built tunnel in China with the designed service life over 100 years.The durability of lining concrete are one of an important factors to determinate the service life of tunnel.Considering the main environmental loads and mechanical loads of subsea tunnel,the durability properties of lining concrete under combined action of compressive load and carbonation has been studied through the critical compressive load test,accelerated carbonation test,natural carbonation test and capillary suction test.The tests results show that critical compressive load apparently accelerates the carbonation and deteriorates the anti-permeability of concrete.Under the combined action of critical compressive load and carbonation,the durability of lining concrete decreases.Based on the carbonization life criteria and research results,for the high-performance concrete with proposed mix ratio,the predicted service life of lining concrete for Jiaozhou bay subsea tunnel is about 80 years which fails to reach the required service life.It is necessary to adopt other measurements simultaneously to improve the durability of lining concrete. 展开更多
关键词 Jiaozhou Bay subsea tunnel service life lining concrete durability carbonation property critical compressive load
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Nonlinear analysis on dynamic buckling of eccentrically stiffened functionally graded material toroidal shell segment surrounded by elastic foundations in thermal environment and under time-dependent torsional loads
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作者 D.V.DUNG P.M.VUONG 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI CSCD 2016年第7期835-860,共26页
The nonlinear analysis with an analytical approach on dynamic torsional buckling of stiffened functionally graded thin toroidal shell segments is investigated. The shell is reinforced by inside stiffeners and surround... The nonlinear analysis with an analytical approach on dynamic torsional buckling of stiffened functionally graded thin toroidal shell segments is investigated. The shell is reinforced by inside stiffeners and surrounded by elastic foundations in a thermal environment and under a time-dependent torsional load. The governing equations are derived based on the Donnell shell theory with the yon Karman geometrical nonlinearity, the Stein and McElman assumption, the smeared stiffeners technique, and the Galerkin method. A deflection function with three terms is chosen. The thermal parameters of the uniform temperature rise and nonlinear temperature conduction law are found in an explicit form. A closed-form expression for determining the static critical torsional load is obtained. A critical dynamic torsional load is found by the fourth-order Runge-Kutta method and the Budiansky-Roth criterion. The effects of stiffeners, foundations, material, and dimensional parameters on dynamic responses of shells are considered. 展开更多
关键词 toroidal shell segment functionally graded material (FGM) stiffened shell critical static and dynamic torsional load thermal environment
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From ultra-low friction to superlubricity state of black phosphorus:Enabled by the critical oxidation and load
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作者 Qiang LI Fenghua SU +1 位作者 Yanjun CHEN Jianfang SUN 《Friction》 SCIE EI CAS CSCD 2023年第10期1829-1844,共16页
Based on the density functional theory(DFT),we investigate the friction properties of inevitable oxidized black phosphorus(o-BP).o-BP with the weaker interlayer adhesion exhibits their great potential as a solid lubri... Based on the density functional theory(DFT),we investigate the friction properties of inevitable oxidized black phosphorus(o-BP).o-BP with the weaker interlayer adhesion exhibits their great potential as a solid lubricant.At the zero load,the friction property of o-BP is adjusted by its oxidation degree.Expressly,ultra-low friction of P4O2(50%oxidation,O:P=2:4=50%)is obtained,which is attributed to the upper O atoms with lower sliding resistance in the O channel formed by lower layer O atoms.More attractive,we observe superlubricity behavior of o-BP at the critical load/distance due to the flattening potential energy surface(PES).The flattening PES is controlled by the electrostatic role for the high-load(P4O3,O:P=3:4=75%),and by the electrostatic and dispersion roles for the low-load(P4O2).Distinctly,the transform from ultra-low friction to superlubricity state of black phosphorus(BP)can be achieved by critical oxidation and load,which shows an important significance in engineering application.In addition,negative friction behavior of o-BP is a general phenomenon(Z>Z_(min),Z_(min)is the interlayer distances between the outermost P atoms of minimum load.),while its surface-surface model is different from the fold mechanism of the tip-surface model(Z_(0)<Z<Z_(min),Z_(0)is the interlayer distances between the outermost P atoms of equilibrium state.).Thus,this phenomenon cannot be captured due to the jump effect with instability of the atomic force microscopy(AFM)(Z>Z_(min)).In summary,o-BP improves the friction performance and reduces the application limitation,comparing to graphene(Gr),MoS2,and their oxides. 展开更多
关键词 oxidized black phosphorus(o-BP) ultra-low friction SUPERLUBRICITY critical load/distance FIRST-PRINCIPLES
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Experimental Study and Fragility Analysis of Effective-Length Factors in Column Buckling
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作者 Brannan Shepherd Tadeh Zirakian 《Journal of Building Material Science》 2023年第1期9-16,共8页
The design of columns relies heavily on the basis of Leonhard Euler’s Theory of Elastic Buckling.However,to increase the accuracy in determining the maximum critical load a column can withstand before buckling,a cons... The design of columns relies heavily on the basis of Leonhard Euler’s Theory of Elastic Buckling.However,to increase the accuracy in determining the maximum critical load a column can withstand before buckling,a constant was introduced.This dimensionless coefficient is K,also known as the effective-length factor.This constant is often found in building design codes and varies in value depending on the type of column support that is applied.This paper presents experimental and analytical studies on the determination of the effective-length factor in the buckling stability of columns with partially-fixed support conditions.To this end,the accurate K value of the columns tested by the Instron Testing Machine(ITM)at California State University,Northridge’s(CSUN’s)Mechanics Laboratory is determined.The ITM is used in studying the buckling of columns where the supports are neither pinned nor fixed,and the material cross-section rather rests upon the machine while loading is applied axially.Several column specimens were tested and the experimental data were analyzed in order to estimation of the accurate effective-length factor.The calculations from the tested results as well as the conducted probabilistic analysis shed light on how a fragility curve may aid in predicting the effective-length value of future tests. 展开更多
关键词 Column buckling Fragility curve critical loading Effective length factor Fixity
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