基于中美钢结构设计规范的受弯构件抗弯强度可靠度比较

Reliability analysis for flexural strength of flexural steel member between the steel structural design code of China and America

通过对《钢结构设计标准》(GB 50017—2017)和美国规范AISC 360-10中关于钢结构受弯构件抗弯强度计算的比较,得出两种规范在荷载组合及设计方法方面的差异。进而结合算例采用蒙特卡罗法,在荷载比(活载比恒载)依次取0. 1,0. 25,0. 5,1,2时,通过MATLAB模拟计算得出两种规范的可靠度差异。结果表明,在荷载比较小时,由中国钢结构规范计算的可靠度大于美国规范AISC 360-10,但随着荷载比的增大,由美国规范AISC 360-10计算的可靠度则超过中国钢结构规范。结果可供设计研究人员参考,进一步提高我国钢结构的设计水平。

Bending strength of flexural steel member in Standard for design of steel structures( GB 50017—2017) and American specification AISC 360-10 was compared,and some differences on load combination and design methods of two specifications were obtained. The reliability difference of two specifications was obtained through MATLAB simulation calculation when the load ratio( the live load ratio constant load) was successively taken as 0. 1,0. 25,0. 5,1 and 2 by Monte Carlo method based on the calculation example. The results show that when the load ratio is in a low level,the reliability calculated by Chinese steel structure code is higher than that calculated by America code AISC 360-10,with the load ratio increasing,the reliability calculated by America code AISC 360-10 is exceeding that caculated by Chinese steel structure code. The results can be used as reference for design researchers to further improve the design level of steel structure in China.