基于随机Pushdown方法的钢筋混凝土框架结构抗连续倒塌能力概率评估

发布时间：2018-06-19 01:41

本文选题：钢筋混凝土框架 + 随机Pushdown方法　；参考：《建筑结构学报》2017年02期

【摘要】：为了评估钢筋混凝土框架结构的不确定性参数对其抗连续倒塌能力的影响,将确定性Pushdown分析与可以控制相关性的拉丁超立方体抽样方法(LHS)相结合,提出一种随机Pushdown方法。为说明方法的建立和应用,选择一栋8层4跨的钢筋混凝土框架结构,考虑结构的荷载、材料强度以及几何尺寸等17个不确定性参数,采用Pushdown方法分析获得的结构所能承受的最大竖向荷载作为其抗连续倒塌能力,统计得到结构连续倒塌易损性函数,并采用"龙卷风图"方法对不确定性参数的灵敏度进行了分析。结果表明,结构不确定性参数对抗连续倒塌能力影响显著,结构的抗连续倒塌能力的变异系数达到20%,其中,活荷载、楼层恒荷载、钢筋极限应力以及梁截面钢筋面积等参数对结构抗连续倒塌能力的影响最为显著。
[Abstract]:In order to evaluate the influence of uncertain parameters of reinforced concrete frame structure on its ability to resist continuous collapse, a stochastic pushdown method is proposed by combining deterministic pushdown analysis with Latin hypercube sampling method which can control the correlation. In order to illustrate the establishment and application of the method, a reinforced concrete frame structure with 8 stories and 4 spans is selected and 17 uncertain parameters such as load, material strength and geometric size are considered. The maximum vertical load of the structure obtained by Pushdown method is used as its ability to resist continuous collapse, and the vulnerability function of continuous collapse of the structure is obtained by statistics. The sensitivity of uncertain parameters is analyzed by tornado map method. The results show that the structural uncertainty parameters have significant influence on the continuous collapse ability, and the coefficient of variation of the structure's ability to resist the continuous collapse is up to 20. Among them, the living load, the floor constant load, The ultimate stress of steel bar and the area of steel bar of beam section have the most significant influence on the continuous collapse resistance of the structure.
【作者单位】：哈尔滨工业大学结构工程灾变与控制教育部重点实验室;广西大学土木建筑工程学院;
【基金】：国家自然科学基金项目(51378162,51178150)
【分类号】：TU375.4;TU312.3

【参考文献】