考虑地震方向性的高耸RC烟囱结构易损性分析

发布时间：2018-01-28 12:06

本文关键词： 烟囱地震响应三维地震增量动力分析地震作用方向性　出处：《湖南大学学报(自然科学版)》2017年11期 　论文类型：期刊论文

【摘要】：选用240 m高的某钢筋混凝土烟囱作为研究对象,通过有限元软件ABAQUS,采用复合壳单元建立了相应的非线性有限元分析模型.为考虑地震动的不确定性,根据谱相容性原则,选择了20条合理的地震动记录,进行增量动力分析.分别以材料应变和地面峰值加速度作为结构地震需求参数和地震动强度参数,通过增量动力分析将三维地震动以7种不同入射角度作用于结构并获得的结构地震响应,采用能力需求比模型的曲线拟合法计算结构的易损性.通过钢筋和混凝土的材料应变定义了4个损伤状态限值,最终得到了考虑地震方向性的高耸钢筋混凝土烟囱结构地震易损性曲线.研究结果表明,考虑地震方向性后,当PGA小于0.2g时,该烟囱的最不利地震波输入角度大约在75°~90°左右,结构完全损伤概率大约增大了1.5%;当PGA大于0.2g时,该烟囱的最不利地震波输入角度在45°左右,结构完全损伤概率大约增大了2.4%.
[Abstract]:Use of a 240 m high reinforced concrete chimney as the research object, using the finite element software ABAQUS, a nonlinear finite element model is established using the corresponding composite shell element. Considering the uncertainties of the earthquake, according to the spectral compatibility principle, choose 20 reasonable seismic records were analyzed respectively by incremental dynamic. Strain and peak ground acceleration as seismic demand parameters and seismic strength parameters, the incremental dynamic analysis of three-dimensional motion in 7 different incident angle effect on the structure and structure of the earthquake response, the capacity requirements than the model curve fitting method to calculate the vulnerability of the structure. Through the concrete and steel material strain definition 4 damage limit, finally get the seismic direction of the high reinforced concrete chimney structure seismic fragility curves. The results show that, Considering the earthquake direction, when the PGA is less than 0.2g, the most unfavorable earthquake wave input angle of the chimney at about 75 degrees ~90 degrees, structure damage probability about increased 1.5%; when the PGA is greater than 0.2g, the most unfavorable earthquake wave input angle of the chimney at about 45 degrees, the structure damage probability about increased 2.4%.

【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51478033,51678039) 中央高校基本科研业务费专项资金资助项目(2016YJS103)~~
【分类号】：TU973.12
【正文快照】： 地震作用于结构的方向是任意的.对于有较大偏心距、平面不规则的工程结构,地震作用下容易发生弯扭耦合效应,导致不同的地震波入射角下所得到的结构响应差异较大.对于烟囱而言,由于其使用功能的要求,底部开洞往往使得烟囱不是中心对称结构.在以往的研究中一般将烟囱的开洞方向

【相似文献】