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Study on Ultimate Capacity of Multiplanar CHS KT-joints

Author: HanXu
Tutor: CuiJia
School: Chongqing University
Course: Structural Engineering
Keywords: Steel tubular structure KT-joint Ultimate capacity Failure mode Formula proposed
CLC: TU392.3
Type: Master's thesis
Year: 2009
Downloads: 108
Quote: 4
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Abstract


Multiplanar CHS KT-joint is one of the typical joint configurations in space tubular truss with triangular section. However, the present code GB50017-2003 can not figure out the design of these joints. Finite element analysis of ultimate capacity of multiplanar CHS KT-joints is carried out with ANSYS program in this paper, which takes geometric and material nonlinearity into consideration.The main research content in this article is as follows.①First, the models of multiplanar CHS KT-joints are established by using ANSYS program.Through comparative analysis of different models the appropriate model is established.②Compared with uniplanar joints, space effect, which include the load effect and geometric effect, is an extra and important factor influenced the ultimate capacity of multiplanar joints and can’t be ignored. So the influence of the space effect on the ultimate capacity of KT-joints is studied by FEM. And the intersection curves of the ultimate capacity of T branch and K branch are obtained. Also the influence of the axial force ratio of T branch to K branch on the ultimate capacity of KT-joints is studied.③Finally the failure modes of multiplanar CHS KT-joints are discussed, and the detailed classification is given. Also the history of node displacement, node stress and plasticity spread with loading of different m is described.④The effect laws of the parametersγ,βandφto the ultimate capacity are depicted. Meanwhile the influence of compressed stress ratio in chord n on the ultimate capacity of different m is studied. It shows the influence of all parameters exceptφon the ultimate capacity is obvious. While the chord is compressed, the ultimate capacity decreases, this paper suggestφn could be used to calculate the decreased degree. While KT-joint destroy, the ultimate capacities of branches are interdependence, their relationship could refer to the formula proposed in this paper.⑤Compared with the results got from the formulas of uniplanar joints in code GB50017-2003, the formula of multiplanar CHS KT-joints which can be used in design is propose.

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CLC: > Industrial Technology > Building Science > Building structure > Metal structures > Various types of steel > Steel structure
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