多层非线性抗震钢结构的损失估计与优化设计

Loss Assessment and Optimum Design of Multi-Storey Nonlinear Aseismic Structures

本文通过结构的动力可靠性分析和损失估计建立了以动力可靠性为约束的非线性抗震结构双目标(造价与损失期望)优化设计模型,提出了具体实现这种优化设计思想的实际可行的方法。文中将地震地面运动模拟为平稳过滤有色噪声,建立了以破坏指数刻划的结构体系的模糊震害等级,提出了结构模糊动力可靠性分析和损失估计的具体方法,从而使优化设计模型中各有关量的分析和计算得以具体地实现。

In this paper, an optimization formulation with double objectives (initial construction cost and expected failure loss) and dynamical reliability constraints is established and a feasible method of the corresponding optimum design is presented for the multi-story nonlinear aseismic steel structures. Firstly, the earthquake ground motion is simulated as a stationary filtered non-white noise and the fuzzy damage grades expressed by the damage index of structural system is established. Then, the concrete methods are presented for analysis and determination of fuzzy dynamical reliability and expected failure loss in the optimization formulation of structure.