- 摘 要
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(1 北京工業(yè)大學(xué)北京市高層和大跨度預(yù)應(yīng)力鋼結(jié)構(gòu)工程技術(shù)研究中心， 北京 100124； 2 中國建筑第八工程局有限公司， 上海 200135)
［摘要］高強(qiáng)度螺栓摩擦型連接在承受循環(huán)剪力時(shí)，螺栓拉力和接觸面的摩擦系數(shù)會(huì)隨加載過程發(fā)生變化，因此,使用抗滑移系數(shù)進(jìn)行分析和設(shè)計(jì)不安全。為研究高強(qiáng)度螺栓受剪連接中未處理軋制表面直接接觸、軋制表面間墊設(shè)紫銅片以及螺栓墊圈與軋制鋼板接觸的摩擦系數(shù)，對不同栓桿直徑、不同孔形的4組（12個(gè)）高強(qiáng)度螺栓連接試件開展了循環(huán)加載試驗(yàn)和有限元數(shù)值模擬研究，分析了循環(huán)荷載下連接滑移過程中高強(qiáng)度螺栓拉力及摩擦系數(shù)的變化情況，以及數(shù)值模擬中摩擦系數(shù)的取值方法。結(jié)果表明：改變螺栓直徑或孔型對未處理軋制表面直接接觸的摩擦系數(shù)影響較??；增大螺栓直徑，螺栓墊圈與軋制鋼板接觸的摩擦系數(shù)顯著降低；采用大螺栓孔時(shí)，軋制表面間墊設(shè)紫銅片對摩擦系數(shù)有一定幅度提高；有限元模擬中，雙剪試件輸入摩擦系數(shù)結(jié)果與試驗(yàn)結(jié)果較為吻合，而單剪試件輸入抗滑移系數(shù)結(jié)果與試驗(yàn)結(jié)果吻合程度更高。
［關(guān)鍵詞］高強(qiáng)度螺栓連接；摩擦系數(shù)；抗滑移系數(shù)；循環(huán)荷載；試驗(yàn)研究；有限元模擬
中圖分類號：TU391 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)23-0082-08
Experimental study on friction coefficient of high-strength bolt connections under cyclic loads
LIU Xuechun1, DU Shengquan1, CHEN Xuesen1, YU Shaole2, CHEN Hua2, PAN Junjun2
(1 Beijing Engineering Research Center of High-Rise and Large-Span Prestressed Steel Structures, Beijing University of Technology, Beijing 100124， China； 2 China Construction Eighth Engineering Division Co., Ltd., Shanghai 200135， China)
Abstract:When the high-strength bolted slip-critical connections bear cyclic shear loads, the tension force in the bolts and the friction coefficient between the contact surfaces will change with the loading process. Therefore, it may be unsafe to use the slip coefficient for analysis and design. In order to study the friction coefficient between the untreated surfaces of rolled steel plates in the high-strength bolted shear connection, between the rolled surfaces filled with a red copper sheet, and between the rolled surface of steel plate and the bolt washer, cyclic loading tests and finite element numerical simulation studies were carried out on 4 groups (12) of high-strength bolt connection specimens with different bolt diameters and bolt hole types. The variations of the bolt tension and the friction coefficients during the sliding process under cyclic loads, as well as the value for friction coefficient in finite element models, were analyzed. The results show that, the change of bolt diameter or bolt hole shape has little effects on the friction coefficient between the untreated surfaces of rolled steel plates. When the diameter of the bolt increases, the friction coefficient between the rolled surface of steel plate and the bolt washer decreases obviously. When large bolt holes are used, the friction coefficient between the rolled surfaces filled with red copper increases. In the finite element simulations, the results input of the friction coefficient show good agreement with the test results for the double-shear specimens, while the results input of the slip coefficient shows better agreement with test results for the single shear specimens.
Keywords:high-strength bolt connection； friction coefficient； slip coefficient； cyclic load； experimental study； finite element simulation
*國家自然科學(xué)基金項(xiàng)目(51978013)。
作者簡介：劉學(xué)春，博士，教授，博士生導(dǎo)師，Email:liuxuechun@bjut.edu.cn； 通信作者：陳學(xué)森，博士，助理研究員，Email：chenxuesen@bjut.edu.cn。
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