Analysis On Seismic Performance Of Prestressed Concrete Vierendeel Truss Transfer Structure

In different transfer structure, the prestressed concrete vierendeel truss transferstructure has many advantage: conducive to fix up large pipelines, conducive to theindoor lighting of the building, the stiffness of vierendeel truss is smaller than that oftransfer beam under the same condition to solve serious stiffness mutation, and it canform a greater space. However, today’s theoretical study on high-rise buildings withprestress vierendeel truss transfer is obviously insufficient, experimental study is alsorelatively small, current national design specification does not have clear designrequirements with vierendeel truss transfer story. Therefore, further study is necessaryabout this kind of structure.Nonlinear analysis numerical simulation under low cyclic loading tests is carriedon the prestressed concrete vierendeel truss transfer structure with OpenSees software inthis paper to validation the OpenSees software’s feasibility; Through the staticelastoplastic analysis, comparative study the local deformation, bearing capacity,stiffness, ductility, plastic hinge distribution, energy dissipation capacity and failuremechanism under the seismic action about5structural system with different span anddifferent intensity and different equivalent shear stiffness ratio; In addition, the staticelastoplastic comparison analysis is carried on prestressed and non prestressed concretevierendeel truss transfer structure under seismic action. The following conclusions aredisplayed by analysis:①Perfect the design principles of prestressed vierendeel truss transfer structureproposed by our project group. The structure design principle is: enhancing transferfloor and the lower part, relative weakening the upper part; consider multichannel linedesign, lower chord and frame-supporting columns as the structure’s last line of defense,followed the frame column above transfer srory, among them, the column bottom ofupper column adjacent transformation layer take the same seismic grade withtransformation layer, again is top chord and web member, finally the frame beam abovetransfer srory; In addition to the vertical web members, the transfer structure have tosatisfy the seismic design requirements of " strong column and weak beam, strong shearand weak bending ". The vertical web members can only consider the "strong shearweak bending", but not the "strong column and weak beam ".②Structure system of prestressed concrete vierendeel truss transfer story raising frames designed according to the design principles proposed by our project group andcurrent rules has good overall seismic performance and good ductility, better energydissipation performance model and failure mode, can effectively control localdeformation of key components, and can satisfy the seismic fortification intensity of8degrees and8degrees below the region seismic design requirements.③When the lateral stiffness of transformation layer is close to the lateral stiffnessof upper layer adjacent to transformation layer, the structure’s floor deformation isuniform; With the improvement of fortification intensity, the lateral displacement andstory drift angle of floor increased, more and more deformation tend to convert theupper floor under severe earthquake; With the increase of span, the gap of stiffnessbetween the transformation layer and the upper structure is larger, the lateraldisplacement and story drift angle of floor is small in transformation layer, thedeformation is concentrated in the upper floors.④Compared with the nonprestressed vierendeel truss transition structures, thestructural system has good carrying capacity, stiffness, ductility, and the two systemhave similar seismic behavior of the other.