Shape function-based multi-objective optimizations of seismic design of buildings with elastoplastic and self-centering components

Abstract

Although the current seismic design of buildings ensures collapse resistance, repairs after disasters are time-consuming and costly. High performance structures and reliable design methods that consider repairability are required for resilient communities. This paper proposes a shape function-based framework and adopts a flexural-shear multi-degree-of-freedom model for seismic design optimization. The proposed framework has fewer parameters and higher portability, and provides better results than a component-based framework. Multi-objective particle swarm optimization is adopted to determine feasible structures for multiple requirements. The optimization provides well-designed elastoplastic and self-centering components of 10–60 floor structures and generates suitable maximum displacement, residual displacement, and cost. A simplified calculation method based on the optimized result is proposed and is verified to guarantee a good performance. Additional optimization of the re-centering ratio and hybrid damping of the self-centering component provides a triangular distribution of the re-centering ratio with values of 1.14–1.26 on the lower floor and a viscous damping ratio of 0.04 to 0.07 for each floor. The maximum acceleration is controlled by 0.8 g after the incorporation of hybrid damping.