- 摘 要
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（寧夏大學土木與水利工程學院，銀川 750021）
［摘要］為探究主管局部加墊板的加強方式對圓管K形搭接節(jié)點滯回性能的影響，制作了1個未加強節(jié)點和4個墊板加強節(jié)點，并對其進行擬靜力試驗，得到了各節(jié)點試件的破壞模式、滯回曲線及骨架曲線，量化評價了節(jié)點的承載力、延性和耗能能力，并分析了墊板參數(shù)對節(jié)點滯回性能的影響。結(jié)果表明：未加強節(jié)點的破壞模式為主管表面塑性破壞，伴隨支管趾部屈曲；墊板加強節(jié)點破壞模式為搭接支管屈曲破壞，而主管無明顯變形。主管局部加墊板有效地改善了節(jié)點力學性能，提高了節(jié)點承載力，延緩了主管的塑性變形，避免了在支主管相貫區(qū)域主管壁應力集中的問題。墊板厚度和寬度對節(jié)點承載力均有一定的影響，當墊板寬度為450mm、厚度為5mm時，節(jié)點承載力達到最大416.5kN。利用ANSYS軟件對節(jié)點試件進行模擬，模擬結(jié)果與試驗結(jié)果整體吻合較好。
［關(guān)鍵詞］墊板加強圓管K形搭接節(jié)點；擬靜力試驗；滯回性能；承載力；延性；有限元分析
中圖分類號：TU398-7文獻標識碼：A文章編號：1002-848X(2020)24-0029-06
Experimental study on hysteresis behavior of inserted plate reinforced overlapped K-joints with circular steel tube
YAN Ruhao, YANG Wenwei, MA Pinjun
(School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021， China)
Abstract:In order to investigate the effect of inserted plate reinforced measures on hysteretic behavior of the overlapped K-joints, one unreinforced joint and four inserted plate reinforcement joints were fabricated, and quasi-static test was performed on them. The failure modes, hysteresis curve and skeleton curve of each joint specimen were obtained. The bearing capacity, ductility and energy dissipation of the joints were evaluated quantitatively, and the effect of plate′s parameter on hysteresis behavior of the joints was analyzed. The results show that the failure mode of the unreinforced joints is the plastic failure of the surface of the chord, accompanied by buckling of toe of the brace. The failure mode of the inserted plate reinforced joints is the buckling failure of the overlapped brace while the chord has no obvious deformation. The local inserted plate effectively improves the mechanical properties of the joints, increases the bearing capacity of the joint, delays the plastic deformation of the chords and avoids the large stress concentration of the chord in the area where the braces and chords intersect. The thickness and width of the inserted plate have certain influence on the bearing capacity of the joints. When the width of the inserted plate is 450mm and the thickness is 5mm, the maximum bearing capacity of the joints is 416.5kN. Finally, the ANSYS software was used to simulate the test specimens, and the comparison results are in good agreement with the simulation results.
Keywords:inserted plate reinforced overlapped K-joint; quasi-static test; hysteresis performance; bearing capacity; ductility; finite element analysis
*國家自然科學基金項目（51468054）。
作者簡介：閆汝浩，碩士，Email: YRHendeavor@163.com；通信作者：楊文偉，博士，教授，博士生導師，Email: nxyangww@163.com。
