Study On Seismic Damage Model Of SRC Frame-RC Core Tube Hybrid Structure

SRC frame-RC core tube hybrid structure is widely used as a new type structure system in high-rise building structure,but the performance degradation and the law of the structure under cyclic loading are not clear.In this paper,SRC-RC core tube hybrid structure seismic performance has been tested,and the seismic damage model of the whole structure level is established based on the dynamic characteristics,the main contents and achievements of research are summarized as follows:(1)The quasi-static test was carried out with 10-layer SRC frame-RC core tube hybrid structure scale model.Through the test of the load displacement level,stress distribution and crack development,the damage process,failure mechanism,bearing capacity,dynamic characteristics,ductility and energy dissipation performance of the structure under earthquake are studied.During the test,the dynamic characteristic parameters of the structural model are measured in real time,which provides the basis for establishing the structural seismic damage model based on the structural dynamic characteristics.The experimental results show that the structure eventually overturned and has good ductility and energy dissipation capacity.With the accumulation of structural damage,the frequency of the structure was reduced to different degrees,and the structural natural frequency was used as the physical parameter based on the whole structure level,which can be used to analyze the seismic damage of the whole structure.(2)Structural failure is a complex dynamic instability problem.In this paper,the seismic damage model of SRC frame-RC core tube hybrid structure is established at the whole structural level.The numerical analysis model was established by Opensees platform.The loading conditions and material properties were consistent with those of the experiment.The initial frequency and failure frequency of the modal analysis were in good agreement with the experimental data.The dynamic time history of the seismic wave is analyzed,and the dynamic characteristic parameters of the structural model were obtained.The influence of high-order modes on the structural seismic response is considered,and the relationship between the structural degradation rate and the structural dynamic characteristics is established by considering the influence of the high-order modes on the structural seismic response.The relationship between the structural degradation rate and the structural dynamic characteristics is established.The performance degradation method based on vibration frequency and the seismic damage model.