Experimental study on mechanical performance of KT-type steel tubular intersecting joint
Based on the design of the steel roof structure of a outdoor theater project,a full-scale model test on the key KT-type steel tubular intersecting joint was carried out to analyze the strain distribution law of intersecting line,the main and branch tubulars of the joint.The test result shows that the under the maximum load,intersecting joint cannot continue to carry the load due to partial yielding near the intersecting line of the branch tubular,while the rest the position do not yield,indicating that near the intersecting line of the branch tubular is the weakest position of the intersecting joint.Then the finite element model of the KT-type steel tubular intersecting joint was established by using ANSYS finite element software,and the finite element model was verified by comparing the test result with the finite element analytical result.Finally,the effects of increasing the thickness of the branch tubular and the addition of stiffening ribs on the mechanical performance of the joint was discussed by finite element simulation.The finite element analysis result shows that increasing the thickness of the branch tubular affects mechanical performance insignificantly.Adding the stiffening ribs can obviously reduce the maximum stress level of the position near the intersecting line of the branch tubular,which can effectively postpone yield of the branch tubular,and significantly improve the bearing capacity of the tubular truss joint.
steel tubular intersecting jointfull-scale model testmechanical performancefinite element analysis
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