Seismic behavior of CFDST frame with metallic dampers: Damage-controlled design and performance assessment

• Published in: Soil dynamics and earthquake engineering (1984) 2024-10, Vol.185, p.108867, Article 108867
• Main Authors: Guo, Lei, Wang, Jingfeng, Wang, Wanqian, Guan, Qingsong
• Format: Article
• Language: English
• Subjects: Concrete filled double skin tubular; Damage-controlled seismic design method; Metallic damper; Park & ang index; Seismic performance
• ISSN: 0267-7261
• DOI: 10.1016/j.soildyn.2024.108867

Current investigations on performance-based seismic design of structures generally employed story drift as performance objectives. However, the story drift could only partially reveal the global damage of a structure and not control the damage of important components. In order to control the damage of various components in a structure, this paper proposed a new damage-controlled seismic design method using the Park & Ang indexes of components. Firstly, the Park & Ang damage index was simplified as an equivalent ductility damage index for various components. The energy balance concept was used to observe the hysteretic energy demand which was subsequently distributed to all stories. Thus, the components of each story could be designed based on their damage indexes under design-based and maximum-considered earthquakes. Four concrete filled double skin tubular (CFDST) moment resisting frames equipped with metallic dampers with various layouts were designed based on the proposed design method. Time history analyses on these four structures were performed after validating the accuracy of nonlinear model by Opensees. Analysis results showed that the components in four structures exhibited expected damage states as illustrated by the design method. It also verified that proposed seismic design method was effective to control the damage of various components, which was beneficial for protecting the important components in a structure by setting low damage indexes for them. The seismic design method and analysis results also provided a reference for the design of moment resisting frame with energy devices. •A novel damage-controlled seismic design method was proposed.•Time-history analyses were performed to validate the proposed seismic method.•Damage distributions of different components were assessed.