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作用随机过程组合方法和设计值法相结合得到的地震组合时的通用设计表达式,目的是提高设计的灵活性。由于地震作用的变异性很大,国际标准提出的标准灵敏度系数不再适用,若变量变异性发生较大变化,为提高可靠度控制精度,标准灵敏度系数必须重新取值,而枚举优化法目的性差。通过建立定性优化方向函数,给出每个基本变量标准灵敏度系数所取数值对可靠指标计算值与目标可靠指标差值的贡献,用于标准灵敏度系数的初取值和优化环节,使在作用效应比例对下整体最优。将优化结果用于不同设计使用年限和不同目标可靠指标的情况下得到的相对误差说明,优化方法可以用于设计使用年限50年及一个合适的目标可靠指标情况。
A generic design expression for a seismic combination obtained by combining a stochastic process combination method with a design value method is designed to increase design flexibility. Due to the great variability of earthquake action, the standard sensitivity coefficient proposed by international standards is no longer applicable. If the variability of variables is greatly changed, in order to improve the accuracy of reliability control, the standard sensitivity coefficient must be re-valued, while the enumeration optimization method Poor sex. By establishing the qualitative optimization direction function, the contribution of the standard sensitivity coefficient of each basic variable to the difference between the calculated value of the reliable index and the target reliability index is given, which is used for the initial value and optimization of the standard sensitivity coefficient, The overall ratio of the best. The optimization results can be used to design the service life of 50 years and an appropriate target reliability index when the optimization results are used in different designed service life and different target reliability indicators.