Bending design strength and reliability analysis of Q460GJ steel
Li Jingyao1,2 Nie Shidong1,2 Xiong Gang1,2 Dai Guoxin1,2 Yang Bo1,2
1. Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Education, Chongqing University,
Chongqing 400045, China; 2. School of Civil Engineering, Chongqing University, Chongqing 400045, China
Abstract：Due to its excellent comprehensive mechanical properties, domestic steel plate for building structures have been used in many major building projects in China. The design strength of Q345GJ steel have been provided in relevant national standards and industry codes. Previous studies have proposed the design values of Q460GJ steel under compression-bending based on some experimental results, but the bending design values are not given and need to be further studied. The statistical parameters of the calculation mode uncertainty are obtained based on the test results of the global stability bearing capacity of 27 Q460GJ steel bending members. Based on the statistical results of the Q460GJ steel material properties uncertainty and geometric uncertainty in the previous study, the statistical parameters of resistance uncertainty of bending member welded by Q460GJ steel are obtained. The reliability method is used to calculate the partial factors for resistance under different load combinations, load ratios and variable load ratios. The changing laws of the partial factors for resistance are concluded and the bending design value is recommended to be 435 MPa. Finally, reliability check of the recommended design value is carried out, and the results show that the reliability index corresponding to the recommended design value is greater than 3.2 in most cases, which meets the requirements of GB 50068—2018 “Uniform standard for reliability design of building structures”.
李静尧 聂诗东 熊刚 戴国欣 杨波. Q460GJ钢抗弯设计强度和可靠性分析[J]. 土木工程学报, 2021, 54(9): 28-38.
Li Jingyao Nie Shidong Xiong Gang Dai Guoxin Yang Bo. Bending design strength and reliability analysis of Q460GJ steel. 土木工程学报, 2021, 54(9): 28-38.
