摘要
设计使用年限内锈蚀钢构件的抗力随时间是衰减的,但我国现行GB 50017—2017《钢结构设计标准》假定抗力不随时间改变,导致计算得到的可靠度偏大。采用串联系统模型简化计算时变可靠度,利用蒙特卡洛重要抽样法在计算效率上的优势,给出了锈蚀构件的时变可靠度计算方法。通过抗力时不变算例,对比分析了所推荐方法与传统时不变算法的计算结果,验证该方法的精确性和有效性。进而采用拟合度指标对该方法的参数进行优化分析,给出了该方法计算锈蚀钢构件时变可靠度的参数建议。
The resistance of corroded steel members during the design period deteriorate inevitably with time.However,the resistance is treated as random variables which are independent of time in China’s current specification Standard for Design of Steel Structures(GB 50017—2017),which lead to the reliability is greater than actual value.The series system model was used to simply the time-dependent reliability model,and the calculating procedures of time-dependent reliability were given based on Monte Carlo important sampling method,which is superior in computation efficiency.Through a case of time-in dependent reliability,the calculation results of the proposed method were comparatively analyzed with the traditional invariant algorithm,which proved the accuracy and effectiveness of the proposed method.Finally,the parameters of the proposed method were analyzed and optimized through the fitting degree index,and the parameter recommendations were given for calculating the time-dependent reliability of steel members in the corrosion condition.
作者
罗立胜
陈志华
LUO Lisheng;CHEN Zhihua(College of Civil Engineering and Architecture,Hainan University,Haikou 570228,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China)
出处
《工业建筑》
CSCD
北大核心
2019年第8期1-5,107,共6页
Industrial Construction
基金
国家自然科学基金项目(51808176)
海南省自然科学基金项目(518QN213)
关键词
锈蚀钢构件
主要参数影响
拟合度
时变可靠度
corroded steel members
influences of main parameters
fitting degree
time-dependent reliability
