新型湿接缝钢筋连接构造的力学性能研究  

Mechanical Performance Study on Advanced Type of Wet Joint Bar Connection Structure

作　　者：张育智[1] 刘俊岭 文洁平 梁振飞 彭亦正 ZHANG Yu-zhi;LIU Jun-ling;WEN Jie-ping;LIANG Zhen-fei;PENG Yi-zheng(School of Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Hangzhou Chengdong New Town Construction Investment Co.,Ltd.,Hangzhou,Zhejiang 315040,China;Poly Changda Engineering Co.,Ltd.,Guangzhou,Guangdong 511431,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]杭州市城东新城建设投资有限公司,浙江杭州315040 [3]保利长大工程有限公司,广东广州511431

出　　处：《公路交通科技》2024年第9期152-159,共8页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51678491);中央高校基本科研业务费项目(2682022ZTPY019)。

摘　　要：为了弥补叠合梁桥面板湿接缝普通钢筋连接构造搭接长度大、绑扎或焊接难度高等缺陷,提出了L形钢筋连接构造。采用有限元软件ANSYS,对采用直钢筋、环形钢筋、弧形钢筋和L形钢筋连接构造的叠合梁桥面板湿接缝受力性能开展了数值模拟,对比研究了不同钢筋连接构造条件下湿接缝的受力特征、承载能力和施工工艺。研究结果表明:在湿接缝截面尺寸相同、配筋率相同的条件下,4种钢筋连接构造对应的湿接缝开裂前,非搭接区的混凝土及钢筋应力均高于搭接区,开裂时湿接缝混凝土的开裂位置均位于非搭接区,且开裂荷载与钢筋混凝土轴心受拉构件的开裂荷载理论值较为接近;L形钢筋连接构造的开裂荷载与直钢筋、弧形钢筋连接构造基本一致,但比环形钢筋低4%;4类普通钢筋混凝土湿接缝达到受拉承载力极限状态时均对应于非搭接区纵向钢筋的受拉屈服,湿接缝的受拉极限承载力只与非搭接区普通钢筋的面积和强度的乘积有关,即湿接缝的受拉极限承载力等于非搭接区纵向钢筋屈服时承受的拉力。L形钢筋连接构造在洛溪大桥拓宽工程中的成功应用表明,该连接构造开裂荷载及承载力均与其他钢筋连接构造的湿接缝相当,且具有施工工艺简单,施工便利的优点,值得在类似工程中推广应用。To make up for the defects(e.g.,long lap length and high difficulty in binding or welding)of wet joint ordinary bar connection structure of superimposed beam,an advanced L-shaped bar connection method was proposed.The finite element software ANSYS was used to simulate the mechanical performance of superimposed beam wet joints connected with straight bar,circular bar,curved bar and L-shaped bar numerically.The mechanical characteristics,bearing capacity and construction technology of wet joints by using different bar connection methods were compared.The result indicates that under the condition of the same wet joint section size and the same reinforcement ratio,before the wet joint cracking corresponding to 4 types of bar connection methods,the concrete stress and steel bar stress in the non-lapping area are higher than those in the lapped area.The wet joint concrete cracking position is located in the non-lapping area,and the cracking load is close to the theoretical value of cracking load of reinforced concrete axial tension members.The wet joint concrete cracking load with L-shaped bar connection method is almost the same as that with straight bar and curved bar method,but 4%smaller than that with circular bar method.When the wet joints of 4 types of reinforced concrete reach the ultimate state of tensile bearing capacity,they all correspond to the tensile yield of longitudinal reinforcement in non-lap zone.The ultimate tensile bearing capacity of each type of wet joint is only related to the product of area and strength of reinforcement in non-lap zone,that is,the bearing capacity is equal to the tensile force of longitudinal steel bar in the non-lapped zone when yield.The successful application of L-shaped steel bar connection method in the widening project of Luoxi Bridge shows that the cracking load and bearing capacity of connection structure are equivalent to the wet joints of other steel bar connection.It has the advantages of simple construction technology and convenient construction,which is worthy of

关 键 词：桥梁工程 L形连接钢筋 有限元分析 湿接缝 叠合梁 施工工艺 力学性能 

分 类 号：U443.31[建筑科学—桥梁与隧道工程]