考虑多维随机地震作用的钢烟囱可靠度分析  

Reliability analysis of steel chimney considering multi-dimensional stochastic earthquake action

作　　者：闫龙 胡博 姜云木 王鑫鹏 YAN Long;HU Bo;JIANG Yunmu;WANG Xinpeng(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430074,China;School of Architectural Engineering,Nanning College for Vocational Technology,Nanning 530000,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]武汉工程大学土木工程与建筑学院,湖北武汉430074 [2]南宁职业技术学院建筑工程学院,广西南宁530000 [3]青岛理工大学土木工程学院,山东青岛266520

出　　处：《自然灾害学报》2024年第1期222-230,共9页Journal of Natural Disasters

基　　金：国家自然科学青年基金项目(52008220)。

摘　　要：烟囱是一种将火引起的气体或烟尘排入高空、改善燃烧条件的高耸结构。为了准确分析多维随机地震动作用下钢烟囱的抗震性能,利用基于随机函数约束的POD-降维方法,实现了多维随机地震动在概率层面上的精细化模拟。提出了一种以钢烟囱截面相对水平位移角为指标的结构整体可靠度评价方法。进一步地结合概率密度演化理论,对一座60 m高的钢烟囱进行结构动力响应分析与可靠度评价。结果表明:POD-降维方法生成的样本集具有良好的精度;在相同阈值条件下,以钢烟囱截面相对水平位移角为指标的结构整体可靠度评价方法较规范,且更加保守。Chimney is a kind of high towering structure that discharges the gas or soot caused by fire into the air and improves the combustion conditions.In order to accurately analyze the seismic performance of steel chimney under multi-dimensional stochastic ground motions,the POD-dimension reduction method based on random function constraints is utilized to realize the refined simulation of multi-dimensional random ground motions at the probability level.Subsequently,a method for evaluating the overall reliability of the structure is proposed,which takes the relative horizontal displacement angle of the steel chimney section as an index.Furthermore,combined with the probability density evolution method,the structural dynamic response analysis and reliability evaluation of a 60 m high steel chimney were carried out.The results show that the sample set generated by the POD-dimension reduction method has a good satisfactory precision.Under the same threshold condition,the global reliability evaluation method of the structure based on the relative horizontal displacement angle of the steel chimney section is more conservative than the code.

关 键 词：钢烟囱 多维随机地震动 POD-降维方法 相对水平位移角 整体可靠度评价 

分 类 号：TU391[建筑科学—结构工程] TU279.742