摘要
根据钢筋混凝土横向挡块在地震作用下不同的破坏机制并结合Megally等人的试验结果提出了3种不同的力学模式模拟挡块的性能,即完全弹性模式、简化滞回模式、理想弹塑性模式。其中简化滞回模式可用以模拟当前工程中常见挡块的破坏形态,而理想弹塑性模式可用于模拟具有良好延性能力的挡块。根据这3种力学模型,采用非线性时程分析法讨论挡块对采用板式橡胶支座的规则连续梁桥横向地震反应的影响。研究发现:挡块限位和传力作用的大小与其自身的抗震性能密切相关且受地震动大小的影响;不同性能模式的挡块对结构横向地震响应的影响规律基本一致;在相同的屈服强度下,具有良好延性的挡块在约束主梁位移、限制支座变形和分担主梁惯性力等方面的效果更优,且对墩柱的曲率延性需求和剪力需求影响也较小,是抗震设计的最好选择。
In the light of different failure mechanisms of the transverse reinforced concrete retainer under earthquake and the experimental results of Megally S H, et al, 3 performance modes （ perfect elastic mode, simplified hysteretic mode and perfect elastic-plastic mode） are proposed to simulate the seismic behavior of the transverse retainer. Of which, the simplified hysteretic mode can be used to simulate the failure behavior of the retainer commonly encountered in current engineering projects, and perfect elastic-plastic mode can be used to simulate the behavior of the retainer with sufficient ductility. Based on these modes, the influence of the retainer on the transverse seismic response of a standard continuous girder bridge with elastomeric bearings is investigated applying the nonlinear time history analysis method. It is found that （ 1 ） the efficacy of the retainer in restraining the structural displacement response and transmitting the transverse inertial force is closely related to its performance mode and also the level of the ground motion; （2） the influence trend of retainers on the transverse seismic response of the bridge is almost the same despite of the difference between their performance modes; （3） with the same yield strength, ductile retainers are more effective in decreasing the displacement response of girder and the deformation of bearings as well as partaking the inertial force of girder, and have a slight impact on the curvature ductility demand and the shear demand in pier columns. Of the 3 types of retainers, the ductile retainer is the best choice in the seismic design of bridge structures.
出处
《公路交通科技》
CAS
CSCD
北大核心
2013年第4期53-59,共7页
Journal of Highway and Transportation Research and Development
基金
交通运输部西部交通建设科技项目(200831800098)
关键词
桥梁工程
挡块性能模式
非线性时程分析
规则连续梁桥
地震反应
bridge engineering
performance mode of retainer
nonlinear time history analysis
standardcontinuous girder＇ bridge
seismic response
