地震作用下斜交简支梁桥旋转机理及斜度影响研究

发布时间：2018-03-11 07:08

本文选题：简支梁　切入点：斜交桥　出处：《桥梁建设》2014年03期 　论文类型：期刊论文

【摘要】：为研究地震作用下斜交简支梁桥梁体转动的影响因素,利用OpenSees软件建立考虑碰撞效应的单跨斜交简支梁桥简化动力计算模型,采用模态分析法和时程分析法计算了斜交简支梁桥的动力特性以及非线性地震响应,分析了梁体旋转发生的机理以及斜度对梁体旋转反应的影响。结果表明:对于橡胶支座支承的斜交简支梁桥,当梁体与边界不发生碰撞时,地震作用下梁体的转动由旋转振型引起,最大转角随斜度的增大而增大;当梁体与边界发生碰撞时,碰撞产生的力矩是引起梁体旋转的主要因素,最大转角随斜度的增大呈先增大后减小的变化规律。横向挡块对斜交简支梁桥梁体旋转具有重要影响,忽略其作用最大转角将被高估22.9%~65.0%。
[Abstract]:In order to study the factors affecting the rotation of skew simply supported beam bridge under earthquake action, a simplified dynamic calculation model of single span skew simply supported beam bridge considering collision effect was established by using OpenSees software. The dynamic characteristics and nonlinear seismic response of skew simply supported beam bridges are calculated by modal analysis and time history analysis. In this paper, the mechanism of beam rotation and the effect of slope on the rotation response of beam are analyzed. The results show that for the skew beam bridge supported by rubber bearing, when the beam does not collide with the boundary, The rotation of beam under earthquake action is caused by the rotational mode, and the maximum rotation angle increases with the increase of slope, and when the beam collides with the boundary, the moment generated by the collision is the main factor that causes the rotation of the beam. The maximum rotation angle increases at first and then decreases with the increase of the slope. The transverse block has an important effect on the rotation of the bridge body of skew simply supported beam, and neglecting the maximum rotation angle will be overestimated by 22. 9% and 65. 0%.
【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;同济大学桥梁工程系;
【基金】：国家自然科学基金项目(90815007) 河北省自然科学基金项目(E2011210028)~~
【分类号】：U442.55

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