高疲劳应力幅下部分抗剪连接钢混凝土组合梁的疲劳性能  

Fatigue performance of steel-concrete composite beams with partial shear connection under high fatigue stress ranges

作　　者：杨涛[1,2,3] 刘诗媛 覃炳贤 林广泰 YANG Tao;LIU Shi-yuan;QIN Bing-xian;LIN Guang-tai(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Guangxi Xinfazhan Communications Group Co.,Ltd.,Nanning 530029,China;Department of Bridge Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西新发展交通集团有限公司,广西南宁530029 [3]同济大学桥梁工程系,上海200092

出　　处：《广西大学学报（自然科学版）》2021年第2期298-305,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51568005);中国博士后科学基金资助项目(43XB3782XB);广西自然科学基金资助项目(2014GXNSFBA118258)。

摘　　要：为了研究部分抗剪连接钢混凝土组合梁在高疲劳应力幅下的疲劳性能,对5根组合梁试件开展了等幅疲劳加载试验,以研究栓钉直径、抗剪连接程度和疲劳应力幅对组合梁受力性能的影响。研究结果表明:当组合梁中的钢梁承受200 MPa疲劳应力幅作用时,按照EC3规范计算所得的组合梁疲劳细节的疲劳寿命偏于保守;在经历最初的若干万次疲劳加载后,组合梁的跨中残余挠度可达初始跨中最大挠度的26.0%;100万次疲劳加载后,疲劳损伤引起的组合梁跨中附加挠度可达初始跨中最大挠度的25.0%;与完全抗剪连接组合梁相比,部分抗剪连接组合梁的疲劳受力性能并未表现出显著的差异;在正弯矩作用下,组合梁中的混凝土板按照静力计算方法配筋满足疲劳设计的要求。To investigate the fatigue performance of steel-concrete composite beams with partial shear connection under high fatigue stress range,constant amplitude fatigue loading tests were conducted on five composite beams,and influence of stud diameters,shear connection degrees,as well as fatigue stress ranges on the mechanical performance of composite beams was investigated.Experimental results showed that calculated fatigue life of fatigue details in accordance with EC3 specification was conservative when steel beams were subjected to the fatigue stress range of 200 MPa.After the initial several ten thousands fatigue loading,the residual deflection at the mid-span of the composite beams was up to 26%of the initial maximum deflection.Additional deflection at the mid-span of the composite beams due to fatigue damage was up to 25%of the initial maximum deflection after 1,000,000 cycles fatigue loading.Compared with the composite beam with full shear connection degree,there was no conspicuous difference in fatigue performance for the composite beams with partial shear connection.Slab reinforcement in the sagging moment region of composite beams calculated by the static calculating method can meet the requirements of fatigue design.

关 键 词：钢混凝土组合梁 疲劳性能 附加变形 疲劳应力幅 

分 类 号：TU398.2[建筑科学—结构工程] TU317.1