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针对第三水准“大震不倒”的抗震设防目标,提出一种在强震作用下建筑结构的优化设计方法,依据“用相同的投资获最好的设计”的设计理念,建立了在强烈地震波的作用下,建筑结构最大的层间相对位移最小化作为优化目标,同时满足体积约束的优化数学模型,并采用动力有限元分析模型和高效的显式动力分析方法进行结构分析获得最大的层间相对位移,采用零阶和一阶优化算法分别求解优化数学模型,在显式动力分析软件ANSYS/LS-DYNA的基础上进行二次开发,实现了一个三维框架结构的抗震优化设计,数值结果表明该方法能获得较高质量的解,经优化设计后建筑结构的抗震性能得到了很大的改善,具有现实的工程意义。
Aiming at the seismic fortification goal of the third level “great earthquake does not fall ”, an optimization design method of building structure under the action of strong earthquake is proposed. According to the design concept of “the best design with the same investment” Under the action of strong seismic waves, the maximum relative displacement of the building is minimized as the optimization objective, and the optimal mathematical model satisfying the volume constraints is established. The structural analysis is carried out by using the dynamic finite element analysis model and the explicit explicit dynamic analysis method The maximum relative displacements between layers are obtained. The zero-order and first-order optimization algorithms are respectively used to solve the optimization mathematical model. Based on the explicit dynamic analysis software ANSYS / LS-DYNA, secondary development is carried out to realize the seismic optimization of a three-dimensional frame structure The design and numerical results show that this method can obtain high quality solutions. The seismic performance of the building structure has been greatly improved after the optimization design, which has realistic engineering significance.