负弯矩作用下全宽预应力预制桥面板组合梁力学性能研究  

Mechanical Property of Full-Width Prestressed Precast Bridge Deck Composite Beams Under Negative Bending Moment

作　　者：陈娟 严锴 李懿峰 吴浩 李枝军[3] CHEN Juan;YAN Kai;LI Yifeng;WU Hao;LI Zhijun(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;Suzhou Port and Shipping Development Center,Suzhou 215007,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211800,China)

机构地区：[1]南京航空航天大学民航学院,南京211106 [2]苏州市港航事业发展中心,江苏苏州215007 [3]南京工业大学土木工程学院,南京211800

出　　处：《建筑钢结构进展》2025年第4期35-46,共12页Progress in Steel Building Structures

基　　金：国家自然科学基金(52078249);南京航空航天大学研究生教育教学改革研究项目(2022YJXGG23)。

摘　　要：相较于分块预制桥面板,横向全宽预应力预制桥面板的整体性更好,施工更快捷,因此在装配式组合梁桥中具有较好的应用前景。负弯矩作用下预制桥面板的湿接缝连接是受力的关键部位,因此对负弯矩作用下全宽预应力预制桥面板组合梁的力学性能进行研究,考察了横向预应力筋数量、预应力筋布置方式、剪力连接程度、接缝处材料对结构破坏模式、开裂荷载、抗弯承载力、荷载-位移曲线等力学特性的影响,揭示了预制板接缝处的应力分布规律;针对完全剪力连接的预制桥面板组合梁,提出了负弯矩作用下挠度计算的改进有效惯性矩叠加法,该方法考虑了纵横向预应力的影响,与数值分析结果吻合较好;针对部分剪力连接组合梁,对比了国内外相关规范,发现我国《钢结构设计标准》的适用性更强。Compared with block precast bridge deck,transverse full-width prestressed precast bridge deck has better integrity,faster construction,and a better application prospect in assembled composite beam bridge.The wet joint connection of the precast bridge deck under negative bending moment is the key part of the composite beam.Therefore,the mechanical properties of full-width prestressed precast bridge deck composite beam under negative bending moment are studied,the influence of the number of transverse prestressed bars,the arrangement of prestressed bars,the degree of shear connection and the materials at the joints on the mechanical properties such as structural failure mode,cracking load,bending bearing capacity and load-displacement curve is made clear,and the stress distribution at the joints of precast slabs is revealed.An improved effective moment of inertia superposition method for deflection calculation of precast bridge deck composite beams with complete shear connection is proposed,which considers the influence of longitudinal and transverse prestress and is in good agreement with the numerical results.For composite beams with partial shear connection,the domestic and foreign codes are compared,and it is concluded that the Standard for Design of Steel Structures in China is more applicable.

关 键 词：横向全宽预制桥面板 组合梁 预应力 负弯矩 精细化有限元模拟 改进有效惯性矩叠加法 

分 类 号：TU398.9[建筑科学—结构工程]