新型连接件在轨道交通组合梁负弯矩区的应用  

Application on a New Type of Connector Under Negative Moment Area of Rail Transit Steel-concrete Composite Beam

作　　者：杨敏捷[1] YANG Minjie(China Railway Shanghai Design Institute Group Co.Ltd.,Shanghai 200070,China)

机构地区：[1]中铁上海设计院集团有限公司,上海200070

出　　处：《铁道建筑技术》2020年第8期120-124,共5页Railway Construction Technology

摘　　要：针对钢-混组合梁负弯矩区混凝土桥面板拉应力较大,往往导致桥面板开裂,影响结构安全问题,结合钢-混组合梁负弯矩区常规设计方法,探讨一种能有效解决负弯矩区混凝土桥面板开裂的新型抗拔不抗剪连接件。该连接件不仅保证钢梁与桥面板不分离,而且允许桥面板在钢梁上纵向滑动,能有效释放负弯矩区桥面板中的拉应力;该连接件能提高钢-混组合梁的使用性能、耐久性能;相较其它方法,该连接件构造简单、经济实惠、施工方便。本研究成果可为轨道交通钢-混组合梁桥面板有效控制开裂提供新的思路和参考。The tensile stress of concrete bridge deck in the negative moment area of steel-concrete composite beam is large,which often leads to cracks in the bridge deck and affects the structural safety.In this paper,combined with the conventional design method for negative moment area of steel-concrete composite beam,a new type of uplift-restricted and slip-permitted connector which can effectively solve the cracking of concrete bridge deck in negative moment area is discussed.Results show that:(1)the connector not only ensures that the steel beam is not separated from the bridge deck,but also allows the bridge deck to slide longitudinally on the steel beam,which can effectively release the tensile stress in the bridge deck in the negative moment area.(2)The connector can improve the service performance and durability of the steel-concrete composite beam.(3)Compared with other methods,the connector is simple in structure,economical and convenient in construction.The research results can provide a new idea and reference for the effective control of cracking of the steel-concrete composite beam deck of rail transit.

关 键 词：轨道交通 钢-混组合梁 抗裂 负弯矩区 新型抗拔不抗剪连接件 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]