遗传算法在桥梁结构地震可靠性分析中的应用

Reliability analysis of bridge structure based on genetic algorithms

本论文介绍和总结了目前桥梁结构可靠度问题的研究现状,建立了桥梁结构在随机地震荷载作用下可靠度分析的模型,讨论了桥梁结构在地震力作用下危险截面的选取问题,解决了功能函数的复杂性和难于求导的问题,利用遗传算法对桥梁结构进行了可靠性分析,并与JC算法进行了比较研究。最后,通过算例说明了本文方法的可行性和正确性,本方法可为桥梁结构地震可靠性分析和加固提供理论依据和参考意见。

The summary of recent research state of bridge reliability analysis is presented in this paper. The computational model of bridge structures is established according to random vibration theory and reliability theory. Genetic algorithms （GA） are employed to study the bridge reliability, which are convenient to calculate the structural reliability when the performance function is complex and difficult to get derivative. They are compared with JC algorithm method. Finally, an example is showed and some results are gotten. Analysis methods presented above can be employed to study the reliability and retrofit of practical bridge structures.