Analysis Of Structure Plane Size Seismic Response Influence Of Soil-multistory Buildings Interaction System

Along with advances in construction technology, the emergence of new buildingmaterials, machinery and computer technology widely used in the constructionindustry, the development of multi-story building has a good material foundation andconstruction condition. In the design of structures, seismic analysis is an importantsubject. With the gradual improvement of modern seismic design theory,soil-structure interaction analysis method more and more applied to the engineeringseismic analysis. In the soil-structure interaction problems, the characteristics of thefoundation, the plane size of the structure and the foundation of the structure depth,have varying degrees of impact on seismic response of structure. Throughcomparative analysis, discuss each consideration and improve on the theoreticalachievement of soil-structure interaction theoretical. For this topic, this thesis usesnumerical method to conduct a series of analyzes. The major innovation work andachievements are included:(1) Based on the finite element analysis method, the soil-structure interactioncalculation model was established. The15-storey frame structures with different basearea and similar period were designed. The super element was used in thethree-dimensional models in order to improve the computational efficiency, theconclusion showed that: When the beam and column size and quality are the same,the natural vibration periods in different spans of different frame structure arebasically the same; While considering SSI, the dynamic response is not only relevantwith the structure itself, but also the acceleration of pile caps.(2) Considering soil structure interaction, the total displacement of structure willdecrease with the increase of structure plane size, while displacement caused byfoundation rotation will apparently decrease with the increase of structure plane size.The proportion of elastic deformation displacement and average base shear force bothincrease with the increase of plane size. The peak value is small with considering SSIthan the fixed base model; The bigger the soil stiffness is, the smaller the interactioneffect will be, as well as the peak of top layer displacement response of thesuperstructure, and the foundation rotation displacement the foundation horizontallytranslational displacement will decrease. (3) The total top layer displacement curve peaks of the three structures decreasewith the increase of the depth of foundation, at the same time, the elastic deformationdisplacement’s proportion of the total displacement and average base shear forceincreases gradually. Compared with the base area increase, the structural foundationdepth increase has more significant effect to reduce the total displacement of thestructure top floor. The peak of maximum layer displacement both occurs near theforth layer and the maximum layer displacement decrease with the increase of thedepth of foundation, and both small than the peak of layer displacement of structurewith rigid base.(4) In order to research the influence of structure plane size on seismic response ofsoil-structure interaction in a wider range of applications, a series of research wasstudied based on the response spectrum theory. Obtained the response spectrum curveof revised seismic wave and averaged across those curves. Since the characteristics oforiginal seismic wave are different, the peak of revised seismic wave all reduced invarying degrees. With the increase of structure base area, the peak of responsespectrum curve of those revised seismic wave reduced; If the plane size are same,there are more pronounced effect of SSI with the softer of soil, and peak of responsespectrum curve of those revised seismic wave are more small.