考虑地震动多点激励与材料应变率效应的主跨300m级独塔斜拉桥弹塑性分析

发布时间：2018-01-03 22:31

本文关键词：考虑地震动多点激励与材料应变率效应的主跨300m级独塔斜拉桥弹塑性分析　出处：《计算力学学报》2014年04期 　论文类型：期刊论文

【摘要】：建立主跨300m级独塔斜拉桥MIDAS/Civil空间有限元模型,开发Civil 2MARC可视化接口程序,进而将MIDAS/Civil模型转入MSC.MARC程序中并检验了模型转化前后的一致性。然后,开发了基于地表功率谱的地表多点地震动生成理论的多点地震动可视化软件MEMS_b(Multiple Earthquake Motions Simulation b)。进而说明了适用于多点位移-速度计算模型的相对精确性和容易实现的优势,并与MSC.MARC程序相结合应用于该桥梁的多点激励分析。最后分析了该桥梁地震作用下的薄弱环节与弹塑性反应,并研究多点输入和材料率效应对桥梁地震反应的影响规律。结果表明:(1)开发的可视化接口程序Civil2MARC界面便于操作,运行稳定,转化高效且结果可靠;(2)开发的可视化多点地震动生成程序MEMS_b界面友好,参数设置灵活且结果有效;(3)位移-速度多点计算模型理论完备,并可通过MSC.MARC程序对位移-速度多点计算模型加以实现;(4)解释并给出了应变率效应和多点地震动对该斜拉桥的塑性铰首次出现时间、位置以及计算末态塑性铰分布的影响规律。本文涉及到理论模型、程序开发及应用计算,可为相关工程提供参考。
[Abstract]:The establishment of 300m main span single tower cable-stayed bridge spatial finite element model MIDAS/Civil, developed Civil 2MARC visual interface program, then the MIDAS/Civil model into MSC.MARC program and test the consistency of the model before and after the transformation. Then, based on multi point surface power spectrum of the ground motion generation theory of ground motion visualization software MEMS_b (Multiple Earthquake Motions Simulation b). And that which is suitable for multi point displacement velocity calculation model is relatively accurate and easy to realize the advantages, and combined with MSC.MARC program multi excitation analysis is applied to the bridge girder. Finally analyzes the role of the bridge under the seismic weak links and elastic-plastic response and, study on multi point input and material influence rate effect on the seismic response of the bridge. The results show that: (1) the development of the visual interface program of Civil2MARC interface is easy to operate, transport Stable, high transformation efficiency and reliable result; (2) the development of visualization of multiple ground motion generation program MEMS_b friendly interface, flexible parameter setting and effective results; (3) multi point displacement velocity calculation model of complete theory, and through the MSC.MARC program on the multi-point displacement velocity calculation model is realized; (4 the time for the first time) of the plastic hinge of the cable-stayed bridge and gives the explanation of the effect of strain rate and multi-point ground motion, position and calculate the final effect of the plastic hinge distribution. This paper relates to the theoretical model, development and application of the calculation program, which can provide reference for the related project.

【作者单位】：天津大学建筑工程学院;清华大学土木工程系;中南大学土木建筑学院;大连海洋大学海洋与土木工程学院;北京金土木软件技术有限公司;湖南科技大学土木工程学院;铁道第三勘察设计院桥梁处;
【基金】：国家自然科学重点基金(90815025) 国家自然科学基金(51178249,50938008,51108466) 中国博士后科学基金(2011M500332)资助项目
【分类号】：U448.27
【正文快照】： 1引言事先对结构在地震作用下的动力反应进行数值计算,是把握结构动力特性与保障结构安全性的一种有效方法。结构的动力反应主要取决于三个方面:(1)地震动输入;(2)结构模型;(3)分析方法及计算工具。对于独塔大跨斜拉桥结构形式,本文综合考虑到多点地震动输入、有限元模型的快

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