基于最佳一致性原则的设计表达式分项系数研究

在现行规范设计表达式的基础上,首先根据等超越概率原则,计算了10a至100a设计使用年限内可变荷载的统计参数；其次,校核了现行规范设计表达式隐含的可靠指标,并以此作为确定目标可靠指标的依据；最后,根据最佳一致性优选原则,考虑14种代表性的结构构件、3种可变荷载效应与永久荷载效应的简单组合、不同的可变荷载效应与永久荷载效应的比值,通过概率计算方法优化确定了10a至100a设计使用年限内荷载和抗力的分项系数.设计人员可根据工程实际情况,采用该工程设计使用年限相应的分项系数进行设计.

Study on Partial Coefficients of Design Expression Based on the Principle of Best Consistency

Based on the design expression of current code,statistical parameters of variable loads in 10 to 100-year design working life are calculated according to equal exceeding probability.Furthermore,the reliability index of current design code is calculated and based on it the target reliability index is determined.Finally,according to the principle of best consistency,partial coefficients for 10 to 100-year design working life are deduced by the optimal analysis of 14 types of structural members taking into account 3 types of simple load combinations of dead and live load,and different ratios of live load effect to dead load effect.Designers can adopt corresponding partial coefficients for design according to the design working lives of projects.