| Steel staggered truss frame system with assembly truss-column joints is an ideal steel structural system for its high industrialized degree,less pre-fabricated parts,fast construction speed and less steel consumption per unit area.In order to analyze the influence of the joint rigidity on the seismic behavior of steel staggered truss frame system with assembly truss-column joints,elasto-plastic time history analysis of this structural system was conducted.The main research work and conclusions of this dissertation are as the followings:(1)ABAQUS finite element analytical model of staggered truss structural system was established.Beam elements(B31)were used for column,chord,web member,suspender,strut and brace,and shell elements(S4R)were used for floor.It is verified that the finite model is effective by the comparison of natural vibration period,displacement time curve,the maximum displacement,base shear time history curve,the maximum base shear between the test results and the finite results.(2)15-floor composite staggered truss structures and 10-floor vierendeel staggered truss structures were designed using the ETABS.Assembly truss-column joints were designed by hand and the rotation rigidity of these joints was estimated using the component method.(3)ABAQUS basis finite element analysis models of 15-floor composite staggered truss structures and 10-floor vierendeel staggered truss structures were established.The truss-column joints of the models are as follows: hinged joints,assembly truss-column joints and rigid joints.El-Centro,Taft and lanzhou seismic waves were chosen to conduct time history analysis.The conclusions are as follows:Steel staggered truss frame system with assembly truss-column joints has considerable carrying capacity and lateral stiffness;the lateral displacement of this structural system under rare earthquake can meet standard requirements;the truss-column joints rotation rigidity has little effect on composite staggered truss structures’ natural vibration period,displacement,base shear and dissipation energy.The natural vibration period,displacement,maximum floor shear of vierendeel staggered truss frame system with assembly truss-column joints is closer to steel staggered truss frame system with rigid joints.Assembly truss-column joints of this structural system can be regarded as rigid joints;with the increase of truss-column joints’ rotation rigidity,vierendeel staggered truss structure natural vibration period and displacement decreases,while the energy dissipation and maximum floor shear of this structural system increase.(4)Based on the ABAQUS basis finite element analysis models of 10-floor vierendeel staggered truss structures,three series of model analysis were conducted,the parameters considered including: dimensions of the middle panel of truss,dimensions of truss span and number of the truss panel.The following conclusions were obtained: dimensions of the middle panel of truss have little effect on vierendeel staggered truss structure natural vibration period,displacement,maximum floor shear and dissipation energy;when dimensions of truss span increase,vierendeel staggered truss structure natural vibration period and displacement increase and the maximum floor shear of the vierendeel staggered truss with hinged joints decrease.Dimensions of truss span have little effect on the vierendeel staggered truss structures’ floor shear with assembly truss-column joints and rigid joints.The difference of vierendeel staggered truss structures’ natural vibration period,displacement,maximum floor shear between vierendeel staggered truss structures with hinged joints,rigid joints and vierendeel staggered truss structures with assembly truss-column joints increase,when the number of the truss panel become smaller. |
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