【摘要】 以陕西某铁路大跨连续刚构桥为研究对象,用有限元软件建立了全桥模型,对大跨连续刚构桥进行了初步的推倒分析研究,结果表明,在罕遇地震中,桥梁结构会迅速进入塑性阶段,一般会有3倍～4倍的延性需求;在桥梁设计中,我们应该重视P—Δ效应引起的影响。更多还原

【Abstract】 Taking the large-span continuous rigid frame bridge of some railway in Shannxi as the research object,the paper adopts the finite element software to establish the whole bridge model,undertakes the primary pushover analysis and research on the large-span continuous rigid frame bridge,and proves by the result that the bridge structure can enter into the plastic stage at high speed in rare earthquake and it generally has 3-4 times ductility demand,and the P—Δ effect should be considered in the bridge design.更多还原