The Dynamic Response Study Of Mudmat Subjected To Earthquake In The Deep Sea

At present,the equivalent linearization method is the main method for site seismic response analysis,but a large number of research shows that this method has some disadvantages and There is still room for further improvement.For example,the calculation of an exceptional discrete point is invalid,the calculation of soft soil seismic has abnormal results,the calculation results are unreasonable when the earthquake motion is large,and there are endless loop phenomenon etc.ABAQUS is a powerful general finite element software.It can not only deal with complex boundary conditions problem,but also deal with nonlinear problems better,which provides a powerful tool for reasonable estimation of design earthquake motion parameters.This paper mainly studies the ABAQUS for site seismic response analysis and seismic subsidence foundation,analyzing the specific site calculation with ABAQUS and the influence of input earthquake motion characteristics and site conditions on the seismic response is emphatically analyzed,and the influence of upper load,base area and depth of foundation in foundation seismic subsidence,from which some useful conclusions are obtained.This article mainly completed the following aspects of the work:1.Expound the development process of site seismic response analysis and soft soil seismic subsidence,and summarize the current site seismic response theoretical calculation methods from four aspects,including the determination of earthquake motion,earthquake motion input,soil dynamic constitutive model and artificial boundary condition.2.This paper implements the viscoelastic boundary in ABAQUS and prove the effectiveness of the viscoelastic boundary through the undamped elastic foundation.The results show that when ABAQUS is applied to site seismic response analysis,the viscoelastic boundary on the boundary can be applied to absorb the energy of the reflected wave and the scattered wave at the artificial boundary,so as to simulate the process of the wave passing through the boundary into the infinite domain.3.Through the TKCH site,select the actual bedrock seismic record as input ground motions,comparing the calculation results with the actual seismological records,the error of the finite element calculation results of peak ground acceleration and the measured data is 4%.the surface acceleration response spectrum and the measured surface acceleration response spectrum shape is similar,so as to test the reliability of application of ABAQUS for seismic response analysis.4.Based on site 1 and site 2,the actual measured seismic records of Elcentro,Taft and San Simeon are selected as input earthquake motions.ABAQUS software is used to analyze the site seismic response,testing the effect of different types of seismic wave and amplitude on the seismic response of soil layer,and the difference of site seismic response in different types of site.Establishing the foundation on the surface,and the interaction between the foundation and the structure under the earthquake action is discussed,and the influence factors of the foundation vertical displacement are further studied.