大跨度连续梁桥的延性抗震分析  

Analysis of Seismic Ductility for Long Span Continuous Bridge

作　　者：王文欣[1,2] 肖杰[2] 杨立坡[2] 刘博海[2] 

机构地区：[1]同济大学,上海市200092 [2]天津市市政工程设计研究院,天津市300051

出　　处：《城市道桥与防洪》2013年第8期85-88,386-387,共4页Urban Roads Bridges & Flood Control

摘　　要：该文阐述了某大跨度连续桥的延性抗震分析。通过对强震区的某大跨连续梁的固定墩采用弹塑性减震耗能装置,可以有效地减小固定墩承受的巨大的水平剪力。在此基础上,对墩柱进行延性抗震设计,并分析比较不同因素对结构延性的影响。结果表明,考虑墩柱的延性可以有效地降低墩柱底部弯矩。配箍率和轴压比对墩柱的延性系数影响较明显,而纵向主筋的配筋率减低,屈服和极限曲率均会降低,对延性系数的影响较小。The article sets forth the analysis of seismic ductility of a long span continuous bridge.The elastic-plastic energy dissipation device is installed in the fixed pier of a long span continuous beam in strong earthquake area,which can efficiently reduce the huge horizontal shear exerted on the fixed pier.On this basis,the article conducts the design of seismic ductility for the fixed pier,and analyzes and compares the influences of the different factors on the structural ductility.The result shows that the considered ductility of fixed pier can efficiently reduce the bending moment on the bottom fixed pier.Moreover,the stirrup ratio and axial compression ratio have a more obvious influence on ductile coefficient of fixed pier.With the main longitudinal reinforcement ratio decreases,the yield curvature and the ultimate curvature will decrease,and the effect on the ductility coefficient is smaller.

关 键 词：桥梁工程 大跨度连续梁桥 延性抗震设计 非线性时程分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]