Seismic fragility analysis of a new type of reinforced concrete energy dissipation structure

In order to improve the seismic performance of reinforced concrete (RC) frame structure, high performance fiber reinforced concrete (HPFRC) energy dissipation walls were installed in RC frame to form a new aseismic structure. Two half- scale HPFRC energy dissipation wall-RC frame specimens were designed and constructed. Quasi-static tests were performed to study the failure mechanism, deformation performance, and energy dissipation performance. The test results indicate that HPFRC energy dissipation wall-RC frame structures can achieve the seismic fortification objective of being "repairable after major earthquake". Based on the incremental dynamic analysis (IDA) method, seismic fragility analysis of the HPFRC energy dissipation wall-RC frame structure was performed by using PERFORM-3D structural analysis software and 44 ground motion records. The results show that the HPFRC material has good tensile strain hardening performance, which can improve the damage resistance and energy dissipation capacity of the structure or components. When the structure collapses, the average spectral acceleration response corresponding to the fundamental period of the structure calculated by 44 ground motion records is greater than the spectral acceleration corresponding to the fundamental period of the structure duringa rare earthquake with a fortification intensity of 8 degree, so the HPFRC energy dissipation wall-RC frame structure has good anti-collapse ability. Under the action of a rare earthquake of magnitude 8, the exceeding probability of collapse of the HPFRC energy dissipation wall-RC frame structureis 0.03%, which meets the requirements forseismic protection of the structure under the action of a large earthquake.