基于成本—效益指标的隔震支座参数优化

Optimization of Isolation Bearing Parameters Based on Cost-Effectiveness Index

根据建筑结构隔震设计的特点,研究了基于成本—效益指标的隔震支座参数优化问题,提出了以结构整体成本—效益指标为目标函数的隔震支座参数优化方法,从而在隔震设计中同时考虑结构的初始造价和地震损失成本。采用无导数信赖域的优化算法进行隔震支座参数优化,主要约束为基于首次超越失效准则的结构动力可靠度。最后通过一个隔震支座设计实例,分别采用文中提出的优化设计方法和传统隔震设计方法进行设计并对比结果,最后讨论了结构期望损失成本对优化设计的影响,从而验证提出方法的可行性。

According to the characteristics of seismic isolation design of building structure, this paper studies the parameter optimisation problem of seismic isolation bearing based on a cost-effectiveness index, and proposes the optimisation method of seismic isolation bearing parameter with the overall cost-effectiveness index as the objective function. Therefore, the initial cost and the cost of earthquake loss are taken into account in the seismic isolation design. In this paper, a derivative-free trust-region optimisation algorithm is used to optimise the parameters of isolation bearings. The primary constraint is the structural dynamic reliability based on the first transcendental failure criterion. Finally, through an example of isolation bearing design, the optimal design method proposed in this paper and the traditional isolation design method are used to design and compare the results. The effect of expected loss cost of structure on the optimal design is also discussed in this paper, to verify the feasibility of the proposed method.