大直径钢筋装配式混凝土足尺框架拟动力试验研究OA北大核心

In order to study the seismic performance of concrete frames with large-diameter rebar,pseudo-dynamic test of three-story and two-span full-scale frame with large-diameter rebar was carried out.The failure mode,dynamic time-history response,and seismic performance indicators of the frame under the three seismic fortification standards were analyzed.The research results indicate that the frame has no cracks and is in an elastic state under frequent earthquake.Micro-cracks appear in the frame under design basis earthquake,and the cracks are closed at the end of the test.After rare earthquake,the frame is in elastoplastic state.When the seismic performance is determined by the seismic bearing capacity and residual deformation,the seismic performance 3(integrity)is achieved under frequent earthquakes,and the seismic performance 4(light to moderate damage)and seismic performance 4(not serious damage)is achieved under design basis earthquakes and rare earthquakes.The curve of the base shear-inter-story drift basically changes linearly under each earthquake,and has good hysteretic properties.After the rare earthquake,the main rebar of the column did not yield,and the main rebar of the first and second floor beams did yield,realizing the design goal of'strong column and weak beam'.A finite element comparative analysis was conducted on the large-diameter reinforced concrete frame and the ordinary diameter reinforced concrete frame,and the results showed that the average difference in inter-story drift and inter-story shear force between each story was-5.73％and-1.41％,respectively,indicating similar dynamic performance.