Experimental study on seismic performance of earthquake-damaged prefabricated groove frame beam with high ductile concrete
In this paper,an experimental study was conducted involving one earthquake-damaged frame beam and three earthquake-damaged prefabricated frame beams to investigate the seismic performance of earthquake-damaged prefabricated groove connection frame beams reinforced with high ductility concrete(HDC).The beams were subjected to low-cyclic reversed loading tests to analyze the failure modes and seismic performance.The results show that HDC forms a constraint effect to effectively restrain the cracking and damage component.The bearing capacity of the HDC-reinforced earthquake-damaged frame beam increases by 66.7％,the displacement ductility coefficient increases by 88％,and the cumulative energy dissipation increases by 12.1％compared to the original prefabricated frame beam.These improvements demonstrate that the seismic performance of earthquake-damaged prefabricated groove frame beams can be substantially restored,while also enhance the brittle failure characteristics of the original structure.Additionally,the presence of lateral and bottom steel plates significantly influences the stiffness and bearing capacity of the prefabricated groove frame beams.Based on the observed failure characteristics,the shear capacity of the earthquake-damaged prefabricated groove frame beams was calculated using a tension-compression bar model,and the calculated results were found to be in good agreement with the experimental outcomes.
万方数据
维普
