A model for predicting the interface behavior of epoxy asphalt and steel composite beam under negative bending is developed incorporating partial interaction theory. Interfacial slips between the steel deck and the ep...A model for predicting the interface behavior of epoxy asphalt and steel composite beam under negative bending is developed incorporating partial interaction theory. Interfacial slips between the steel deck and the epoxy asphalt surfacing are included in the model with a new parameter of membrane stiffness. A series of analytical equations based on this model are derived to calculate slip and strain at the interface. Also, a numerical procedure for calculating the load responses of simply supported composite beams with concentrated force at the mid-span is established and verified with two samples. Characters of slip and strain at the interface, sensitivities of tensile stress and interface shear stress with material parameters are studied. It can be concluded that interfacial effects decrease the bending stiffness of the composite; hard and stiff bonding material is better for asphalt surfacing layer working at normal to low temperatures, and the damage of the asphalt surfacing layer will be accelerated with the damage accumulation of the bonding coat.展开更多
沥青混凝土路面最常用的维修方法之一是铣刨沥青混凝土路表面并回铺罩面,而铣刨作业不论是国内或国外多釆用传统的沥青混凝土路面铣刨方法。近年美国佐治亚州交通厅(Georgia Department of Transportation,GDOT)联合佐治亚理工学院(Geor...沥青混凝土路面最常用的维修方法之一是铣刨沥青混凝土路表面并回铺罩面,而铣刨作业不论是国内或国外多釆用传统的沥青混凝土路面铣刨方法。近年美国佐治亚州交通厅(Georgia Department of Transportation,GDOT)联合佐治亚理工学院(Georgia Institute of Technology)对微铣刨技术在沥青混凝土路面上的养护应用进行研究,发展出经济有效的薄透水抗滑层养护技术并成功地应用于高承载州际公路。通过施工规范的制定,品质检测技术的改进,及现场施工流程的改进,这个新的养护技术成功地应用在I-75和I-95州际公路上,每一车道/英里为GDOT节省58 000美元,并且微铣刨后的路表面纹理细致,可以开放车辆行驶,大幅提高施工期间的行车安全并增加施工弹性,达到省料、省时、省工和节能减碳的效果。目前这个新工法已经被佐治亚州普遍地釆用在州际公路薄透水抗滑层的维修作业以替代传统的铣刨作业。本文针对这个结合微铣刨技术的薄透水抗滑层养护技术及其在佐治亚州的施工案例做详细介绍,并探讨微铣刨技术在中国应用到铣刨沥青混凝土路表面并回铺罩面的维修作业时的一些问题。展开更多
To investigate the fatigue damage of epoxy asphalt pavement(EAP)under a heavy load and a d temperature load,the load-figure of the heavy load on the steel bridge deck pavement(SBDP)was simulated first,and the temperat...To investigate the fatigue damage of epoxy asphalt pavement(EAP)under a heavy load and a d temperature load,the load-figure of the heavy load on the steel bridge deck pavement(SBDP)was simulated first,and the temperature distribution of SBDP during the temperature-fall period in winter was also calculated.Secondly,t e moving heavy load coupled W t the most unfavorable temperatre load was applied to the SBDP,and the tensile stress on the top of SBDP was calculated.Finally,the fatigue damage of EAP was evaluated considering the extreme situation of heavily overloaded and severe environments.The results show that botte heavy load and the temperature load during t e temperature-fall period c n increase the tensile stress on the top of SBDP significantly.In the exteme situation of heavily overloaded and severe environments,a fatigue crack is easily generated,and thus the SBDP should avoid t e coupling effects of the heavy loadand the temperature load in winter.展开更多
基金The National Natural Science Foundation of China(No50578038)
文摘A model for predicting the interface behavior of epoxy asphalt and steel composite beam under negative bending is developed incorporating partial interaction theory. Interfacial slips between the steel deck and the epoxy asphalt surfacing are included in the model with a new parameter of membrane stiffness. A series of analytical equations based on this model are derived to calculate slip and strain at the interface. Also, a numerical procedure for calculating the load responses of simply supported composite beams with concentrated force at the mid-span is established and verified with two samples. Characters of slip and strain at the interface, sensitivities of tensile stress and interface shear stress with material parameters are studied. It can be concluded that interfacial effects decrease the bending stiffness of the composite; hard and stiff bonding material is better for asphalt surfacing layer working at normal to low temperatures, and the damage of the asphalt surfacing layer will be accelerated with the damage accumulation of the bonding coat.
文摘沥青混凝土路面最常用的维修方法之一是铣刨沥青混凝土路表面并回铺罩面,而铣刨作业不论是国内或国外多釆用传统的沥青混凝土路面铣刨方法。近年美国佐治亚州交通厅(Georgia Department of Transportation,GDOT)联合佐治亚理工学院(Georgia Institute of Technology)对微铣刨技术在沥青混凝土路面上的养护应用进行研究,发展出经济有效的薄透水抗滑层养护技术并成功地应用于高承载州际公路。通过施工规范的制定,品质检测技术的改进,及现场施工流程的改进,这个新的养护技术成功地应用在I-75和I-95州际公路上,每一车道/英里为GDOT节省58 000美元,并且微铣刨后的路表面纹理细致,可以开放车辆行驶,大幅提高施工期间的行车安全并增加施工弹性,达到省料、省时、省工和节能减碳的效果。目前这个新工法已经被佐治亚州普遍地釆用在州际公路薄透水抗滑层的维修作业以替代传统的铣刨作业。本文针对这个结合微铣刨技术的薄透水抗滑层养护技术及其在佐治亚州的施工案例做详细介绍,并探讨微铣刨技术在中国应用到铣刨沥青混凝土路表面并回铺罩面的维修作业时的一些问题。
基金The National Natural Science Foundation of China(Nos.51378122,51678146)the Scientific Research Foundation of Graduate School of Southeast University(No.YBJJ1680)
文摘To investigate the fatigue damage of epoxy asphalt pavement(EAP)under a heavy load and a d temperature load,the load-figure of the heavy load on the steel bridge deck pavement(SBDP)was simulated first,and the temperature distribution of SBDP during the temperature-fall period in winter was also calculated.Secondly,t e moving heavy load coupled W t the most unfavorable temperatre load was applied to the SBDP,and the tensile stress on the top of SBDP was calculated.Finally,the fatigue damage of EAP was evaluated considering the extreme situation of heavily overloaded and severe environments.The results show that botte heavy load and the temperature load during t e temperature-fall period c n increase the tensile stress on the top of SBDP significantly.In the exteme situation of heavily overloaded and severe environments,a fatigue crack is easily generated,and thus the SBDP should avoid t e coupling effects of the heavy loadand the temperature load in winter.
