钢管桁架结构中T型相贯节点地震易损性分析

发布时间：2018-03-18 13:14

本文选题：钢管桁架结构　切入点：T型相贯节点　出处：《天津大学学报(自然科学与工程技术版)》2017年S1期 　论文类型：期刊论文

【摘要】：针对平面桁架结构中杆件承受轴力为主的特点,采用相贯节点腹杆与弦杆相贯面的局部变形作为衡量节点破坏程度的参数,建立了平面管桁结构中T型相贯节点发生轻微破坏、中等破坏、严重破坏的地震易损性指标.通过建立节点实体单元模型并对其滞回性能进行分析,建立了等效非线性分析模型,并与现有试验结果进行了对比分析,结果表明等效非线性分析模型能很好地模拟节点的局部变形,在保证了计算精度的同时,解决了地震易损性分析中计算时间过长的问题.选取单榀桁架结构关键点为非线性节点,使用Monte-Carlo法对桁架结构进行了地震易损性分析与评估,得到了易损性曲线,为此类结构抗震性能的评估提供1种新方法.
[Abstract]:According to the characteristic that the members of the plane truss are subjected to the axial force, the local deformation of the intersecting plane of the web and chord of the intersecting joint is used as the parameter to measure the failure degree of the joint, and a slight failure of the T-type intersecting joint in the plane truss structure is established. The seismic vulnerability index of moderate failure and severe damage. By establishing the node solid element model and analyzing its hysteretic performance, the equivalent nonlinear analysis model is established, and the results are compared with the existing test results. The results show that the equivalent nonlinear analysis model can simulate the local deformation of nodes well and ensure the accuracy of calculation at the same time. The problem of long calculation time in seismic vulnerability analysis is solved. The key points of a single truss structure are selected as nonlinear joints. The seismic vulnerability analysis and evaluation of truss structures are carried out by using Monte-Carlo method, and the vulnerability curves are obtained. A new method for evaluating the seismic performance of this kind of structures is provided.
【作者单位】：天津大学建筑工程学院;滨海土木工程结构与安全教育部重点实验室(天津大学);
【基金】：国家杰出青年科学基金资助项目(51525803) 科技部国家重点研发计划资助项目(2016YFC0701103) 天津市建设系统科学技术发展计划资助项目(2014-06)
【分类号】：TU312.3;TU392.3

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