高墩大跨度连续刚构桥典型施工阶段地震损伤分析

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (22) : 89-95.

论文

石岩，张奋杰，韩建平，李军，秦洪果，杨雄

作者信息 +

Seismic damage analysis of a long-span continuous rigid frame bridge with high piers during typical construction stages#br#

SHI Yan，ZHANG Fenjie，HAN Jianping，LI Jun，QIN Hongguo，YANG Xiong

Author information +

文章历史 +

摘要

大跨度桥梁施工周期长，在强震区施工期间经受地震的风险较高；以一座悬臂浇筑施工的高墩大跨度连续刚构桥为背景，选取施工期间典型的5个T型刚构为研究对象，采用MIDAS/Civil进行施工阶段分析并得到各个阶段的内力状态；提出了一种模拟主梁关键截面真实内力状态的简化方法，基于OpenSees建立动力分析模型；通过输入10组具有向前方向效应和滑冲效应的三维近断层地震动记录进行增量动力分析，以桥墩顶部位移、位移延性系数、Park-Ang损伤指数和主梁位移、钢筋应变为考察指标，对比分析了各指标在桥梁不同施工阶段的地震反应与损伤情况。结果表明：处于典型施工阶段的桥墩在近断层地震动作用下会发生较严重的地震损伤，且随着施工主梁悬臂段的增长桥墩的地震损伤更严重，横桥向损伤程度较纵桥向严重，纵桥向墩底损伤程度较墩顶严重。

Abstract

Long-span bridges are possible to suffer earthquake during the long construction period, especially in high seismic zones.A long-span continuous rigid frame bridge with high piers, constructed by the method of cantilever casting, was selected as the background project, and the internal force states in five typical T-shaped rigid frames in different construction stages were analyzed by using MIDAS/Civil.A simplified method was proposed to simulate the real internal force states at the key sections of the girder.Meanwhile, some corresponding dynamic models were developed on the OpenSees computation platform, and the incremental dynamic analysis was carried out by inputting 10 sets of three-dimensional near-fault ground motion records with forward directivity pulses and fling-step pulses.The seismic responses and damage of the bridge in different construction stages were compared comprehensively from the perspectives of the roof displacement of piers, displacement ductility factor, Park-Ang damage index, girder displacement and steel bar strain.The results show that the piers in the typical construction stages will suffer serious damage under near-fault ground motion, and the damage will be more severe as the growth of cantilever segments.The damage in transverse direction is more serious than that in longitudinal direction, and the bottom of piers also demonstrates a worse situation than the top in longitudinal direction.

导出引用

石岩，张奋杰，韩建平，李军，秦洪果，杨雄. 高墩大跨度连续刚构桥典型施工阶段地震损伤分析[J]. 振动与冲击, 2020, 39(22): 89-95

SHI Yan，ZHANG Fenjie，HAN Jianping，LI Jun，QIN Hongguo，YANG Xiong. Seismic damage analysis of a long-span continuous rigid frame bridge with high piers during typical construction stages#br#[J]. Journal of Vibration and Shock, 2020, 39(22): 89-95

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