输电塔作为电力系统中重要的基础设施,其抗震性能对电力系统的稳定性和安全性具有至关重要的作用。传统的输电塔抗震分析通常忽略了土–结构相互作用(Soil–Structure Interaction,简称SSI效应),这导致对地震响应的预测较为保守。随着...输电塔作为电力系统中重要的基础设施,其抗震性能对电力系统的稳定性和安全性具有至关重要的作用。传统的输电塔抗震分析通常忽略了土–结构相互作用(Soil–Structure Interaction,简称SSI效应),这导致对地震响应的预测较为保守。随着研究的深入,越来越多的研究开始考虑这个因素,特别是在强震或复杂地质条件下,土体与结构之间的相互作用对结构的振动响应和稳定性有着显著影响。本文综述了考虑土–结构相互作用的输电塔抗震研究,分析了SSI效应对输电塔抗震性能的影响,并详细介绍了目前关于土–结构相互作用的研究方法、成果并展望了未来的研究方向。Transmission towers, as significant infrastructure in the power system, play a vital role in the stability and security of the power system. The seismic performance of traditional transmission towers is usually analyzed while ignoring the Soil-Structure Interaction (referred to as the SSI effect), resulting in a relatively conservative prediction of seismic responses. With in-depth research, an increasing number of studies have begun to consider this factor. Particularly under strong earthquakes or complex geological conditions, the interaction between the soil and the structure has a remarkable impact on the vibration response and stability of the structure. This paper reviews the seismic research of transmission towers considering the soil-structure interaction, analyzes the influence of the SSI effect on the seismic performance of transmission towers, and elaborates on the current research methods, achievements regarding the soil-structure interaction, and looks forward to future research directions.展开更多
Isolation technique of ground structure is a hot topic in the field of earthquake engineering and structure dynamics.Since soil-isolated structure dynamic interaction study is of great significance to enhance seismic ...Isolation technique of ground structure is a hot topic in the field of earthquake engineering and structure dynamics.Since soil-isolated structure dynamic interaction study is of great significance to enhance seismic performance of isolated structures and revision of relevant isolation specifications,research on dynamic interaction of soil-isolated structure has attracted more and more attention.Based on the basic theory of soil-structure dynamic interaction,we summarize and analyze the research status quo of soil-isolated structure dynamic interaction by means of theoretical analysis,numerical simulation,model test,prototype observation and seismic performance.After reviewing the results of previous research,we reveal that some key issues,which can be used to uncover dynamic interaction mechanism and seismic response characteristics of soil-isolated structures interaction system,should not be neglected.Based on the concept of seismic performance design and the latest research of soil-isolated structure dynamic interaction,we predict the future development of soil-isolated structure dynamic interaction by elastoplastic time history analysis method,seismic performance level and practical analysis method based on energy.展开更多
The interaction between geogrid and soil is crucial for the stability of geogrid-reinforced earth structure. In finite element （FE） analysis, geogrids are usually assumed as beam or truss elements, and the interacti...The interaction between geogrid and soil is crucial for the stability of geogrid-reinforced earth structure. In finite element （FE） analysis, geogrids are usually assumed as beam or truss elements, and the interaction between geogrid and soil is considered as Coulomb friction resistance, which cannot reflect the true stress and displacement developed in the reinlbrcement. And the traditional Lagrangian elements used to simulate soil always become highly distorted and lose accuracy in high-stress blocks. An improved geogrid model that can produce shear resistance and passive resistance and a soil model using the Eulerian technique, in combination with the coupled Eulerian-Lagrangian （CEL） method, are used to analyze the interaction between geogrid and soil of reinforced foundation test in ABAQUS. The stress in the backfill, resistance of geogrid, and settlement of foundation were computed and the results of analysis agree well with the experimental results. This simulation method is of referential value for FE analysis of reinforced earth structure.展开更多
In order to resolve grid distortions in finite element method(FEM), the meshless numerical method which is called general particle dynamics(GPD) was presented to simulate the large deformation and failure of geomateri...In order to resolve grid distortions in finite element method(FEM), the meshless numerical method which is called general particle dynamics(GPD) was presented to simulate the large deformation and failure of geomaterials. The Mohr-Coulomb strength criterion was implemented into the code to describe the elasto-brittle behaviours of geomaterials while the solid-structure(reinforcing pile) interaction was simulated as an elasto-brittle material. The Weibull statistical approach was applied to describing the heterogeneity of geomaterials. As an application of general particle dynamics to slopes, the interaction between the slopes and the reinforcing pile was modelled. The contact between the geomaterials and the reinforcing pile was modelled by using the coupling condition associated with a Lennard-Jones repulsive force. The safety factor, corresponding to the minimum shear strength reduction factor "R", was obtained, and the slip surface of the slope was determined. The numerical results are in good agreement with those obtained from limit equilibrium method and finite element method. It indicates that the proposed geomaterial-structure interaction algorithm works well in the GPD framework.展开更多
Recently, the mode approximation method(MAM) has been adopted to analyze beam elements against blast load. However, in real cases, the main structural element of an underground structure is slab and side wall since th...Recently, the mode approximation method(MAM) has been adopted to analyze beam elements against blast load. However, in real cases, the main structural element of an underground structure is slab and side wall since they not only support the structure itself but also may sustain external loads from blast, earthquake, and other kinds of impact. In the present study, the MAM is extended from beam to plate elements and the soil-structure interaction is considered and simplified when calculating structural response under blast load. Pressure-impulse diagrams are generated accordingly for further quick damage assessment.展开更多
文摘输电塔作为电力系统中重要的基础设施,其抗震性能对电力系统的稳定性和安全性具有至关重要的作用。传统的输电塔抗震分析通常忽略了土–结构相互作用(Soil–Structure Interaction,简称SSI效应),这导致对地震响应的预测较为保守。随着研究的深入,越来越多的研究开始考虑这个因素,特别是在强震或复杂地质条件下,土体与结构之间的相互作用对结构的振动响应和稳定性有着显著影响。本文综述了考虑土–结构相互作用的输电塔抗震研究,分析了SSI效应对输电塔抗震性能的影响,并详细介绍了目前关于土–结构相互作用的研究方法、成果并展望了未来的研究方向。Transmission towers, as significant infrastructure in the power system, play a vital role in the stability and security of the power system. The seismic performance of traditional transmission towers is usually analyzed while ignoring the Soil-Structure Interaction (referred to as the SSI effect), resulting in a relatively conservative prediction of seismic responses. With in-depth research, an increasing number of studies have begun to consider this factor. Particularly under strong earthquakes or complex geological conditions, the interaction between the soil and the structure has a remarkable impact on the vibration response and stability of the structure. This paper reviews the seismic research of transmission towers considering the soil-structure interaction, analyzes the influence of the SSI effect on the seismic performance of transmission towers, and elaborates on the current research methods, achievements regarding the soil-structure interaction, and looks forward to future research directions.
基金This work was supported by the National Natural Science Foundation of China(No.51778282).
文摘Isolation technique of ground structure is a hot topic in the field of earthquake engineering and structure dynamics.Since soil-isolated structure dynamic interaction study is of great significance to enhance seismic performance of isolated structures and revision of relevant isolation specifications,research on dynamic interaction of soil-isolated structure has attracted more and more attention.Based on the basic theory of soil-structure dynamic interaction,we summarize and analyze the research status quo of soil-isolated structure dynamic interaction by means of theoretical analysis,numerical simulation,model test,prototype observation and seismic performance.After reviewing the results of previous research,we reveal that some key issues,which can be used to uncover dynamic interaction mechanism and seismic response characteristics of soil-isolated structures interaction system,should not be neglected.Based on the concept of seismic performance design and the latest research of soil-isolated structure dynamic interaction,we predict the future development of soil-isolated structure dynamic interaction by elastoplastic time history analysis method,seismic performance level and practical analysis method based on energy.
基金Supported by National Natural Science Foundation of China (No. 50678032)
文摘The interaction between geogrid and soil is crucial for the stability of geogrid-reinforced earth structure. In finite element （FE） analysis, geogrids are usually assumed as beam or truss elements, and the interaction between geogrid and soil is considered as Coulomb friction resistance, which cannot reflect the true stress and displacement developed in the reinlbrcement. And the traditional Lagrangian elements used to simulate soil always become highly distorted and lose accuracy in high-stress blocks. An improved geogrid model that can produce shear resistance and passive resistance and a soil model using the Eulerian technique, in combination with the coupled Eulerian-Lagrangian （CEL） method, are used to analyze the interaction between geogrid and soil of reinforced foundation test in ABAQUS. The stress in the backfill, resistance of geogrid, and settlement of foundation were computed and the results of analysis agree well with the experimental results. This simulation method is of referential value for FE analysis of reinforced earth structure.
基金Projects(51325903,51279218)supported by the National Natural Science Foundation of ChinaProject(cstc2013kjrcljrccj0001)supported by the Natural Science Foundation Project of CQ CSTC,ChinaProject(20130191110037)supported by Research fund by the Doctoral Program of Higher Education of China
文摘In order to resolve grid distortions in finite element method(FEM), the meshless numerical method which is called general particle dynamics(GPD) was presented to simulate the large deformation and failure of geomaterials. The Mohr-Coulomb strength criterion was implemented into the code to describe the elasto-brittle behaviours of geomaterials while the solid-structure(reinforcing pile) interaction was simulated as an elasto-brittle material. The Weibull statistical approach was applied to describing the heterogeneity of geomaterials. As an application of general particle dynamics to slopes, the interaction between the slopes and the reinforcing pile was modelled. The contact between the geomaterials and the reinforcing pile was modelled by using the coupling condition associated with a Lennard-Jones repulsive force. The safety factor, corresponding to the minimum shear strength reduction factor "R", was obtained, and the slip surface of the slope was determined. The numerical results are in good agreement with those obtained from limit equilibrium method and finite element method. It indicates that the proposed geomaterial-structure interaction algorithm works well in the GPD framework.
基金Supported by the National Natural Science Foundation of China(No.51308388)the Natural Science Foundation of Tianjin(No.13JCQNJC07500)the State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University
文摘Recently, the mode approximation method(MAM) has been adopted to analyze beam elements against blast load. However, in real cases, the main structural element of an underground structure is slab and side wall since they not only support the structure itself but also may sustain external loads from blast, earthquake, and other kinds of impact. In the present study, the MAM is extended from beam to plate elements and the soil-structure interaction is considered and simplified when calculating structural response under blast load. Pressure-impulse diagrams are generated accordingly for further quick damage assessment.
