- 摘 要
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（1 河北建筑工程學(xué)院， 張家口 075031； 2 河北省土木工程診斷， 改造與抗災(zāi)重點實驗室， 張家口 075031； 3 國網(wǎng)冀北電力有限公司張家口供電公司， 張家口 075000； 4 國網(wǎng)冀北電力有限公司經(jīng)濟技術(shù)研究院， 北京 100038）
［摘要］為研究冷彎方鋼管柱-H型鋼梁外伸端板單向螺栓（hollo-bolt）連接節(jié)點的靜力性能，對3個足尺寸的邊柱節(jié)點進行了靜力加載試驗，試驗研究參數(shù)為端板厚度和柱壁厚度。通過分析試驗現(xiàn)象得到了不同端板厚度、柱壁厚度下單向螺栓連接節(jié)點的靜力性能及破壞機理等，繪制了彎矩-轉(zhuǎn)角曲線，對節(jié)點核心區(qū)各組件的應(yīng)力-應(yīng)變曲線進行了詳細的分析。研究結(jié)果表明：隨端板厚度增加，節(jié)點承載力不斷增加，當(dāng)端板厚度達到16mm后，端板厚度不再是節(jié)點承載力控制的主要因素； 在其他條件不變的情況下，柱壁厚度對節(jié)點承載能力及轉(zhuǎn)動能力有顯著影響，柱壁厚度增加可有效提高節(jié)點剛度和承載能力。節(jié)點的極限轉(zhuǎn)角較大，節(jié)點具有良好的變形能力，破壞形態(tài)主要有端板彎曲變形、單向螺栓套筒剪斷和柱壁鼓曲變形破壞3種。
［關(guān)鍵詞］抗彎節(jié)點； 冷彎方鋼管柱； 單向螺栓； 外伸端板； 靜力加載
中圖分類號：TU318文獻標(biāo)識碼：A文章編號：1002-848X(2021)02-0057-07
Experimental study on performance of the connection joints of cold-formed square steel tubular columns and H-shaped steel beams extension endplate using blind bolts
LIU Zhongyang1,2, TANG Qingsong3, DONG Xinyuan1, WENG Weisu1,2, ZHAO Jiaxing1, ZHANG Jinmei4
(1 Hebei University of Architecture, Zhangjiakou 075031, China; 2 Hebei Key Laboratory for Diagnosis, Reconstruction and Anti-disaster of Civil Engineering, Zhangjiakou 075031, China; 3 State Grid Zhangjiakou Power Supply Company, Zhangjiakou 075000, China; 4 State Grid Jibei Power Supply Company Institute of Economics and Technology, Beijing 100038, China)
Abstract:In order to study the static performance of the connection joints of cold-formed square steel tubular (CFST) columns and H-shaped steel beams extension endplate using blind bolts(hollo-bolt), the static loading test was carried out on 3 full-size side column joints, and the experimental research parametersis the endplate thickness and column wall thickness. Through analysis of experimental phenomena, the static performance and failure mechanism of blind bolt joints with different endplate thicknesses and column wall thicknesses were obtained. The bending moment-angle curve was drawn, and the stress-strain curve of each component in the core area of the joint was analyzed in detail. The results show that the bearing capacity of the joint increases continuously as the thickness of the endplate increases, but when the endplate thickness reaches 16mm, the endplate thickness is no longer the main factor controlling the bearing capacity of the joint. When other conditions remain unchanged, the column wall thickness has a significant influence on the bearing capacity and rotational capacity of the joint. The increase in the thickness of the column wall can effectively improve the stiffness and bearing capacity of joint. The ultimate turning angle of the joint is larger and the joint has a large deformation capacity, and there are three main failure modes: endplate bending deformation, blind bolt sleeve shear cut and column wall bulging deformation.
Keywords:bending joint; cold-formed square steel tubular column; blind bolt; extended endplate; static loading
*河北省教育廳高校青年基金項目（QN2017323），國網(wǎng)冀北電力有限公司張家口供電公司科技項目（2016）。
作者簡介：劉仲洋，博士，副教授，Email:samrtlzy@sina.com； 通信作者：董新元，碩士，Email:2542877944@qq.com。
