Study On 2D Numerical Simulation Of Earthquake Responses Of Surface Building Groups

The rapid development of China's economy has caused many people to flock to cities for better development.The tight construction land has made today's structures mostly dominated by high-rise buildings,and the seismic design of high-rise buildings has become particularly important.The design object is placed on the site separately,and only the seismic response of the isolated building structure is considered.In fact,most of the time the building does not exist alone.There are a lot of other building structures around the building in the city,which are closely distributed.Neighboring buildings inevitably have extremely complex interactions in earthquakes,that is,structure-soil-structure interactions.At present,domestic research on this piece is in its infancy and is often analyzed by simplifying model materials and other methods.Non-linear materials are not considered,and the initial stress under static action is not considered.In order to more accurately study the influence of structure-soil-structure interaction on the structure,this paper chooses two types of sites,? and ?,and uses ABAQUS software.Combined with the nonlinear soil constitutive structure developed by Professor Zhuang,a single model and two and three reinforced concrete rafts with various spacing are established on it.A two-dimensional finite element model of a plate-frame structure is used as a research object.Through static-dynamic transformation finite element simulation calculation,the three macro parameters of peak acceleration,inter-layer displacement angle,and peak shear force are analyzed to explore the distance and the number of buildings.Influence on the SSSI interaction effect,and compare and analyze the difference between the building structure in different locations affected by the structure-soil-structure interaction.The results show us these.(1)The interaction of structure soil structure has a significant effect on the peak acceleration,inter story displacement angle and peak shear response of the structure during earthquake,which can produce favorable or unfavorable effects.Among them,the most unfavorable factor is 33.48%.Maximum influence coefficient of maximum displacement angle between layers-21.08%,and tend to be favorable.The maximum influence coefficient on shear peak value is-71.45%,and the most unfavorable influence coefficient is 18.97%.(2)The influence characteristics of SSSI effect on the three parameters are different.Among them,the influence of SSSI effect on the peak acceleration is more controlled by the spacing ratio.When the spacing ratio is 1 and 2,SSSI effect is the most unfavorable to the peak acceleration response of the structure.The seismic waves with more high frequency components will make the maximum displacement angle move upward.The peak shear response is more affected by the structure position,and the peak shear at the top and bottom of the structure is more easily affected by the SSSI effect.Similarly,when the spacing ratio is 6,the influence of structure soil structure interaction can be ignored.(3)Compared with class II,the dynamic interaction of structure soil structure will have a greater impact on the peak acceleration,inter story displacement angle and shear peak of the target structure,which is more adverse.