三跨斜交简支梁桥动力计算模型简化方法研究

发布时间：2018-03-28 07:32

本文选题：斜交桥　切入点：简支梁桥　出处：《振动与冲击》2017年17期

【摘要】：以一座斜交角为45°的3×30 m简支梁桥为工程背景,借助Open Sees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]:Taking a 3 脳 30m simply supported beam bridge with 45 掳oblique angle as the engineering background, a single beam model and a multi-beam model are established with the aid of Open Sees software. The longitudinal impact effect at the expansion joint is only considered when the collision effect is ignored. At the same time, considering the longitudinal impact at the expansion joint and the transverse impact at the seismic block, the variation law of the peak rotation angle and the longitudinal maximum displacement of the bridge deck caused by the earthquake are analyzed. The calculation accuracy of the two models is compared with that of the refined plate element model. The results show that both the multi-beam model and the single-beam model can reasonably reflect the actual seismic response of the three-span skew simply supported beam bridge. The accuracy of the multi-beam model is generally higher than that of the single-beam model, and the accuracy of the calculation results can be improved by improving the distribution of the mass of the main beam node in the single-beam model, and the average accuracy can be increased by 8.7%.
【作者单位】：石家庄铁道大学土木工程学院;石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室;石家庄铁道大学大型结构健康诊断与控制研究所;
【基金】：国家自然科学基金(51508347) 河北省自然科学基金项目(E2015210038) 河北省大型基础设施防灾减灾协同创新中心项目(HB2011011) 河北省重点学科建设项目(桥梁与隧道工程)的项目(XK1700702)
【分类号】：U441.3

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