Shaking Table Test And Numerical Analysis Of The Interaction Between Loess And Multi-ribbed Composite Wall Structure

Multi-ribbed composite wall structure,which is a new assemble energy-saving building system,has faster construction speed,good seismic performance,significant economic benefits,etc.Existing codes in seismic design of multi-ribbed composite wall structure assumes that the foundation is rigid.Because of different stiffness of soil and structure,soil and structure influence each other during an earthquake.So the interaction between soil and ribbed-composite wall structure is of practical significance for the seismic design.Funded by the National Natural Science Foundation of China,the shaking table test of the interaction between soil and ribbed-composite wall structure has been conducted.Numerical Simulation has been conducted on the prototype of the test model and it shows that the calculated results are in agreement with the experimental results.On the basis of the verification,the response law of soil and composite wall structure interaction system under different conditions has been discussed.The main work is as follows:(1)This paper has designed the shaking table test.The similarity between the model and the prototype has been deduced.The model of multi-ribbed composite wall structure has been designed considering the characteristics of the prototype structure.The soil container has been welded by steel plate,which is five times the size of the upper structure.This paper has designed the shaking table test procedure considering the multiple seismic loading.Extraction and analysis of the part data of the shaking table test has been accomplished.The result shows that acceleration waveform at different elevations are not identical and the acceleration waves peak occurs at different time.(2)Numerical Simulation has been conducted on the prototype of the test model considering setting contact between soil and structure,balancing ground stress in thesoil and adopting framework and equivalent elastic composite plate model as a simplified model of multi-ribbed composite wall structure.The numerical simulation result shows that the calculated values agree well with the experimental values in terms of acceleration waveform and peaks.(3)On the basis of the verification,numerical analysis of the shaking table test of the interaction between loess foundation and multi-ribbed composite has been conducted.Loading different intensity seismic waves on the numerical model,the paper investigates the influence of earthquake intensity on the dynamic response of soil and structure.Loading different characteristic seismic waves on the numerical model,the result shows that different characteristics of the input ground motion has great influence on the dynamic response of the interaction system of soil and multi-ribbed composite wall structure.Applying horizontal and vertical ground motions to the interaction system at the same time,the paper compares the result with the data of the one-way horizontal loading to discuss the influence of vertical seismic loads on the horizontal dynamic response of the structure.At last,this paper adopts different foundation depth to investigate the effects of foundation depth on dynamic response of multi-ribbed composite wall structure.