Full-scale Experiment Research On Tension-shear Nodes Of Space Staggered Truss Of Guotai Arts Center In Chongqing

Space staggered truss structure system, developed from Spatial Steel Structure which is applied to the industry extensively, plays a role in"architectural structure stage"as a new structural system. Chongqing GuoTai Arts Centver which is recently under construction adopted such structure, forming a unique"TiCou"shape truss。In three dimensions each truss unit that formed the space staggered truss is neither at the same direction nor in the same plane. Therefore, with a large number of nodes and members, the spatial relation is complicated. Due to complex node forms and large load bearing, the unique nodes jointing staggered truss is the important part that bears different force. There are few theories and experimental study about nodes of space staggered truss at home and abroad and even fewer relevant material for referencing, hence it is necessary to fill in the gap by experimental results in order to provide basis for further space truss designs and research.Along with Chongqing GuoTai Art Centre's project, full-scale experimental studies of space staggered truss'three kinds of particular node have been performed under the combined action of tension and shear, basing upon Chongqing GuoTai Art Centre's unique"TiCou"truss design. In the later stage, the large-scale finite element analysis software---ANSYS has been employed to simulate loading calculation and data collected have been analyzed and contrasted.In the thesis, the following studies on space staggered truss node have been carried out by means of experiment and finite element analysis:(1) The absolute horizontal displacementof the specimen, relative deformation of node region along the direction of tension and shear, stress of the node region have been obtained from the tension and shear static force destruction test of three distinctive full-scale space staggered truss nodes specimens. In addtion, the weak location of nodes, failure mode and ultimate bearing capacity have been tested. The relative deformation and stress distribution have become the focus. The conclusions draw upon the final data analysis could provide reference for future node designs and research.(2) Based on finite element simulation, comparison has been made with data collected from relative deformation of specimen's node region, law of stress distribution and ultimate bearing capacity.The conclusion verifies that stress distribution around node region is complex; the rapture of weld seam connecting main tube and branch tube could cause structure failure and brittle fracture; small displacement of the specimen at its ultimate bearing capacity and the rapture of weld seam linking truss members before the break of nodes indicate that this kind of nodes could mthe force transfering of space staggered truss under static force.