三跨斜交简支梁桥动力计算模型简化方法研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (17) : 231-237.

论文

湛敏1,2，王军文1,2，闫聚考3

作者信息 +

Study on simplified method of dynamic calculation model for three-span simply-supported skewed girder bridge

ZHAN Min1,2，WANG Jun-wen1,2，YAN Ju-kao3

Author information +

文章历史 +

摘要

以一座斜交角为45的330m简支梁桥为工程背景，借助OpenSees软件建立单梁模型和多梁模型，在忽略碰撞效应、仅考虑伸缩缝处纵向碰撞效应、同时考虑伸缩缝处纵向碰撞与抗震挡块处横向碰撞效应三种情况下，分析地震引起的桥面峰值转角及纵向最大位移的变化规律，并通过与精细化板单元模型计算结果的对比研究两种模型的计算精度。结果表明：忽略碰撞作用时，多梁模型和单梁模型均能合理反映三跨斜交简支梁桥实际的地震反应；考虑碰撞作用时，多梁模型的计算精度普遍高于单梁模型；通过改进单梁模型主梁节点质量的分布方式，可提高计算结果的精度，平均可提高8.7。

Abstract

A simplified single beam model and a multi beam model of three-span girder bridge with the skew angle of 45° were established by the software OpenSees. Maximum rotation angle and longitudinal displacement caused by earthquake of deck were analyzed in three cases including ignoring pounding effect, only considering longitudinal pounding effect between decks at expansion joints, considering both longitudinal pounding effect and transverse pounding effect between deck and shear keys. And the comparison was made between the results of the simplified models and a detailed model with plate elements. The results show that both the simplified single beam model and the multi beam model can reasonably reflect the actual seismic responses of structures when ignoring pounding effect. When considering pounding effect, the calculation accuracy of multi beam model is generally higher than single beam model. The calculation accuracy of single beam model could be improved by an average of 8.7% through modifying the joint mass distribution of girders.

导出引用

湛敏1,2，王军文1,2，闫聚考3. 三跨斜交简支梁桥动力计算模型简化方法研究[J]. 振动与冲击, 2017, 36(17): 231-237

ZHAN Min1,2，WANG Jun-wen1,2，YAN Ju-kao3. Study on simplified method of dynamic calculation model for three-span simply-supported skewed girder bridge[J]. Journal of Vibration and Shock, 2017, 36(17): 231-237

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