我国历代混凝土结构设计规范构件承载力的安全度水平校核

Checking of safety level of component bearing capacity in previous generations of code for design of concrete structures

本文分析了《混凝土结构设计规范》TJ 10-74、GBJ 10-89、GB 50010-2002及GB 50010-2010规定的构件受拉、轴心受压、受弯、受剪的承载力极限状态设计方法的安全度水平,计算其可靠指标,与现行《建筑结构可靠性设计统一标准》规定的目标可靠指标对比,评定不同版本混凝土结构设计规范的安全水平。结果表明:除74版本规范规定的受剪承载力计算外,各版本规范规定的各类承载力设计方法的可靠指标均大于目标可靠指标,且有不同程度的增长,《建筑结构可靠性设计统一标准》GB 50068-2018和《工程结构通用规范》GB 55001-2021发布后,各类承载力设计方法的可靠指标也有一定程度的增长。

In this paper,the safety level of the limit state design methods for load bearing capacity of members subjected to tension,axial compression,bending and shear as stipulated in the Code for design of concrete structures(TJ 10-74),(GBJ 10-89),(GB 50010-2002)and(GB 50010-2010)is studied,its reliability index is calculated,and it is compared with the current Unified standard for reliability design of building structures to evaluate the safety level of different versions of concrete structure design codes.The results show that except for the 74 version of the Code for shear members,the reliability indexes of the design methods of various types of load-bearing capacity design method specified in each version of the Code are greater than the target reliability indexes,and there are different degrees of growth,and the reliability indexes of various types of force members after the release of Unified standard for reliability design of building structures(GB 50068-2018)and General code for engineering structures(GB 55001-2021)also have a certain degree of growth.