Analysis On Plate Stress State Of Base-isolated Multi-tower Structure With A Large Floor To Multi-dimensional Earthquake

The base-isolated multi-tower structure with a large floor is often used inisolation projects. It solved the structure of adjacent buildings or the structure need toset up structural joints in isolation need to ensure the isolation bearing unimpededmovement lead to the structural joints of the superstructure wide. Its isolation layeruses a large floor. Isolation bearing will be located below the overall connection ofthe base floor; the superstructure does not hinder the movement of the isolationbearing, the structural joints of the superstructure width to the value according to theprovisions of the traditional seismic structure.The mode of vibration base-isolated multi-tower structure with a large plate oftenassociated with reverse component, in the earthquake, the plate between the towers iseasy to produce large forces, resulting in partial damage to the plate. Such adverseeffects will be more prominent in the multi-dimensional seismic. The seismicresponse of multi-tower structure in the previous studies have recognized, but notdeep enough study on vibration characteristics of the base-isolated multi-towerstructure with a large floor and the floor stress state of the structure in themulti-dimensional earthquake, the designer is no uniform standard for reference.Therefore,Comparative analysis of the vibration characteristics of the different forms ofbase-isolated multi-tower structure with a large floor, and make a FEM analysis of thestructure, nonlinear time-history analysis of the structure is employed. Get the stressof the floor each hour in multi-dimensional earthquake excitation. The weak positionsand the influencing factors of the floor stress state are discussed.The main computation are as follows：1)Describes the theory of multi-dimensional seismic response analysis, isolationstructure and the research status of the base-isolated multi-tower structure with a largefloor.2)The calculation models and calculation methods basic theory are described, andto comprehensively compare the vibration mode and the cycle characteristics of thesymmetry tower and asymmetric tower.3)Make a FEM analysis of base-isolated multi-tower structure with a large plateby MSC.MARC, Nonlinear time-history analysis of the structure is employed. Get the stress of the floor each hour in multi-dimensional earthquake excitation. The weakpositions and the influencing factors of the floor are discussed. Discuss the upperstructure to take a different form of layout of the backplane internal forces;4)Make nonlinear time-history analysis of the irregular base-isolated multi-towerstructure with a large floor，which is a real project. To simulate the floor of thisengineering structures stress state of seismic waves in different directions input,According to the analysis of the effect of earthquakes of various magnitudes, obtainedthe weak position and its plastic development of the structural floor.At last, some reasonable conclusion and suggestions are put forward to the designin similar real project.