Study On Influencing Factors Of Seismic Effect Of Double-Tower Structure With Large Chassis

Large chassis multi-tower is a complex high-rise structure,its large size complex,irregular plane,uneven stiffness distribution,and it will produce a complex twist,cause its design and seismic research is difficult.At present,the study of multi-tower in large chassis is not very mature,especially in its seismic aspects,the vibration is various and complex,the research is also quite troublesome,so far there has not been a complete set of design theory,so the structure Research is necessary.In this paper,the impact factors of the double-tower structure of large chassis are studied comprehensively.The factors influencing the effect of horizontal earthquake are changed,and the period,shape,internal force and displacement characteristics before and after the change are compared,and a simplified calculation method is proposed.In this paper,we first introduce the most commonly used theoretical analysis method-response spectrum method of double chassis structure of large chassis.Through the derivation of response spectrum theory,the vibration mode participation coefficient and structural seismic response of double tower structure are analyzed.According to the five basic vibration.The vibration characteristics of the structure are analyzed from the angle of vibration decomposition.The large-scale finite element software MIDAS GEN is used to establish the basic model of the structure,and the structure is analyzed by changing the influencing factors such as the number of tower floors,the number of large chassis layers,the thickness of the floor panel,the location of the tower,the opening of the floor and the position of the embedded end.The seismic response characteristics of the structural models before and after the influencing factors,including the vibration characteristics of the vibration period,the seismic forces,the internal forces and displacements,and the structure are also compared with those of the structures.Some special parts of the internal force and displacement of the bar.According to the comparison results,the influence degree of the relevant factors on the structure and the problems in the design of the large chassis are obtained.The results show that the number and stiffness of the large chassis and the change of the number and position of the tower have some influence on the structure.Finally,the simplified method of structural analysis is studied.One is to analyze the structure of the twin towers into two single-tower structures,and compare the seismic response characteristics of the single-tower structure and the double-tower structure.The large chassis The internal force and displacement of the tower part are slightly smaller than that of the large chassis single tower structure.In some cases,the large chassis symmetrical double tower structure can be divided into single tower calculation;one is to change the embedded The position of different embedded ends on the seismic effect of the structure is analyzed,and a structural model with both accurate and simple embedded ends is selected.