Holistic damage assessment of reinforced concrete frame structure under two #br#
successive earthquakes accounting for damage accumulation
Han Jianping1 Wei Shiyu1 Li Yiming2
1. Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of
Technology, Lanzhou 730050, China; 2. Guangzhou University, Guangzhou 510405, China
Abstract： For the holistic damage evaluation of structures, a new-type damage index model, namely the Ebrahimian damage model was adopted in this paper. The engineering demand parameters (EDPs) such as inter-story drift ratios can be used to assess the holistic accumulative damage of structures by this damage modelIn order to verify the validity of this new-type damage model, the Ebrahimian damage model and the modified Park damage model were both used to assess the damage level of structures under one singular earthquake and two successive earthquakes, respectively. Take a six-story RC frame structure with three spans as case study, the damage of the structure was evaluated for the 2 singular earthquake cases and four combination cases of two successive earthquakes. The results show that the damage assessment via the Ebrahimian damage model is simple and only a few parameters are necessary. The similar trend of holistic damage of the structure is obtained by these two damage models, which indicates that the holistic damage of the structure can be preferably assessed by the new-type damage model. The accumulative damage of RC frame structure is obvious and damage level increases significantly under two successive earthquakes comparing with the damage level under one singular earthquake. Thus, it is necessary to consider the impact of the possible aftershocks for seismic analysis and design of structures.
