Experimental Study On Seismic Performance Of Building With Frame-core Tube

A 1/50 scaled model, taking a structure with 41 stories as prototype, was designed on the basis of dynamic similitude relationship and a series of shaking table tests were conducted in the State Key Laboratory of Disaster Reduction in Civil Engineering of TongJi University in order to study the dynamic response and seismic performance of a super high-rise building with concrete frame-core tube in this paper. The El-centro wave, Kobe wave and Shanghai artificial wave were inputted with the peak of acceleration and time interval were adjusted on base of the similarity coefficient of acceleration and time. The white noise with the peak of acceleration is 0.07g was scanned to measure the natural frequencies, the damping ratios and vibration mode of the model structure after different series of ground wave were inputted.The natural frequency, damping ratio, vibration mode curve, acceleration amplification factor, displacement, inter layer drift angle, strain distribution and inter story shear force of the structure were obtained according to the calculation and analysis on the foundation of the test data, meanwhile, the modal and transient analysis of the finite element model, created based on the test model, were established by the finite element analysis software ANSYS and the analytical results were compared with the experimental ones to verify the accuracies of the finite element model.The research results indicated that the natural frequency of the structure decreased, damping ratio of the system increased basically and the peak of vibration mode curve reduced with the increase of the vibration number. The dynamic characteristics of structure did not change a lot in the whole process, which indicated that the structural damage was not serious. The dynamic response of structure was not only in connection with the magnitude but also with waveform of input seismic waves. The maximum of the inter layer drift angle was 1/1016 when the acceleration’s peak of the inputted wave was 0.133g which can meet the requirement of the limit value of elastic inter layer drift angle in the specification, which indicated that the test model structure could meet the requirement of no damage with weak earthquake. The maximum of the inter layer drift angle was 1/177 when the acceleration’s peak of the inputted wave was 1.14g which beyond the requirement of the limit value of elastic inter layer drift angle in the specification but could the requirement of the limit value of elastic-plastic inter layer drift angle in the specification. Combined with the phenomenon of the test, a conclusion could be drawn that the test model structure had favorable ductility that could meet the requirement of collapsing with strong earthquake. The research results can provide reference for the aseismic design of similar super high-rise building.