Strength of tubular welded joints of roof trusses in Shanghai Qizhong Tennis Center |
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Authors: | Lewei TONG Min GU Yiyi CHEN Liying ZHOU Jiandong SUN Yangji CHEN Yingru LIN Gao LIN |
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Affiliation: | (1) College of Civil Engineering, Tongji University, Shanghai, 200092, China;(2) Shanghai Institute of Architectural Design and Research Co, Ltd, Shanghai, 200041, China |
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Abstract: | Static strength of multi-planar welded joints with seven brace members and one chord member made of circular hollow sections
is investigated in the paper, based on the engineering practice of moveable roof trusses of Shanghai Qizhong Tennis Center.
Firstly, comparative experiments were carried out on two model joints with a scale of 1:3. One joint was not reinforced, whereas
the other was reinforced with ring stiffeners inside the chord member. Failure mode, stress distribution, plastic-zone development
and ultimate load capacity of the joints were investigated, and effects of the ring stiffeners on the joint behavior were
observed through the experiments. Secondly, finite element analysis of both the tested model joints was performed. The calculation
results are in a good agreement with the experimental results, which indicated that the numerical analysis was quite effective.
Finally, the strategy for enhancing strength of the complicated joint is discussed. Parameters study on the constructional
details of ring stiffeners was carried out using FE method. The present research shows the multi-planar circular hollow section
joint with high ratio of diameter to thickness of the chord and multiple braces is liable to chord plasticity under axial
tension and compression on the braces. For the design of the joint, it is suggested that the ring stiffeners are installed
insider the chord to meet needs of enough stiffness and strength. Both position and number of the stiffeners should be carefully
determined based on the axial forces on the braces and their diameters. The stiffener thickness should not be less than the
chord thickness, and the diameter of the hole at the center of the stiffener should not be greater than half of the chord
diameter.
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Translated from Journal of Building Structures, 2007, 28(1): 36&2-42 译自: 建筑结构学报] |
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Keywords: | multi-planar tubular joints multiple brace members model tests finite element analysis strategy for strengthening connections ring stiffeners |
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