Seismic Performance Analysis and Evaluation of Precast ECC Energy-Dissipating Wall Frame Structures
Engineered cementitious composites(ECC)are cement-based composite materials that ex-hibit strain hardening under tension and the development of numerous fine cracks,making them ideal for energy dissipation.In this paper,ECC was utilized in the plastic hinge areas of precast walls pan-els,forming a new type of prefabricated ECC energy-dissipating wall panel,which was then used in prefabricated shear wall-frame structures.Using the OpenSees simulation platform,a precast ECC en-ergy-dissipating wall panel model was built with the multiple vertical line element for parameter analy-sis.Static elastoplastic and dynamic time-history analysis was conducted on a 12-story precast ECC en-ergy-dissipating wall-frame structure to investigate the influence of the ECC energy-dissipating wall panels on the seismic performance of the frame-shear wall structures.The results showed that the ulti-mate bearing capacity and energy dissipation capacity of the precast ECC energy-dissipating wall panel were improved by 35%and 31%,respectively,compared to ordinary precast shear walls.Static elas-toplastic analysis and fragility analysis results further verified the role of ECC materials in improving the seismic performance of frame-shear wall structures.The seismic performance improvement under near-field pulse-type seismic waves was most significant,indicating that ECC was suitable for seismic applications in near-fault structures.The cost of the precast ECC energy-dissipating wall-frame struc-ture was only 2.1%higher than that of the RC shear wall-frame structure,making the use of ECC en-ergy-dissipating walls an effective and economical solution for improving structural seismic perfor-mance.
万方数据
维普
