钢-UHPC组合梁与PC梁结合段力学特性研究  

Research on the Mechanical Characteristics of the Joint Section Between Steel-UHPC Composite Beam and PC Beam

作　　者：彭彦庆 姚艳 刘盛智 林阳 彭建新 PENG Yanqing;YAO Yan;LIU Shengzhi;LIN Yang;PENG Jianxin(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410000,China;CCCC Road and Bridge Construction Co.,Ltd.,Guangzhou Branch,Guangzhou 510000,China;Hubei Jiangling Yangtze River Bridge Co.,Ltd.,Jingzhou 434000,China;CCCC Second Highway Survey and Design Research Institute Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410000 [2]中交路桥建设有限公司广州分公司,广东广州510000 [3]湖北交投江陵长江大桥有限公司,湖北荆州434000 [4]中交第二公路勘察设计研究院有限公司,湖北武汉430000

出　　处：《河南科技》2024年第21期57-61,共5页Henan Science and Technology

基　　金：国家自然科学基金项目(52378125)。

摘　　要：【目的】研究千米级混合式斜拉桥钢混结合段服役的安全性与可靠性。【方法】以观音寺长江大桥为研究对象,采用ABAQUS建立混凝土箱梁与钢-UHPC组合梁结合段的有限元模型,研究钢混结合段在最不利荷载工况下的力学特性,探讨结合段的传力机理。【结果】结果表明,钢混结合段中各构件的应力水平均在材料容许范围之内,结构具有一定的安全储备;结合段内力过渡平稳,组合梁底板应力在组合梁加强段下降了39.2%,结合段内部钢格室与混凝土的最大压应力分别为40.0 MPa和31.0 MPa,普通混凝土箱梁的应力水平沿着远离结合段的方向逐渐减小,随后保持稳定;在经过承压板后,70%的轴力直接传递给结合段混凝土,剩余轴力由钢构件以较为平缓的趋势向混凝土传递;在组合梁加劲U肋与普通U肋交接位置,结构应力达420.2 MPa。【结论】钢混结合段整体受力性能良好,建议在设计过程中优化加劲构造的布置方案。[Purposes]To study the service safety and reliability of the steel-mixture combination section of kilometer-class hybrid cable-stayed bridge.[Methods]Taking Guanyin Temple Yangtze River Bridge as the research object,the finite element model of the joint section of concrete box girder and steel-UHPC composite beam was established by using ABAQUS,the mechanical characteristics of the joint section under the most unfavorable load conditions were studied,and the force transfer mechanism of the joint section was discussed.[Findings]The results show that the stress levels of each member in the steel-mixture combination section are within the allowable range of the material,and the structure has a certain safety reserve.The internal force of the joint section is stable,and the stress of the bottom plate of the composite beam decreases by 39.2%in the reinforced section of the composite beam.The maximum compressive stress of the steel lattice chamber and the concrete in the joint section is 40.0 MPa and 31.0 MPa,respectively.The stress level of the ordinary concrete box girder gradually decreases in the direction away from the joint section and then remains stable.After passing through the bearing plate,70%of the axial force is transferred directly to the concrete in the binding section,and the remaining axial force is transferred to the concrete by the steel member in a relatively gentle trend.At the joint position between the stiffened U rib and the ordinary U rib,the structural stress reaches 420.2 MPa.[Conclusions]The overall mechanical performance of the steel-concrete joint section is good,and it is recommended to optimize the layout of the stiffening structure during the design process.

关 键 词：混合梁斜拉桥 钢-UHPC组合梁 钢混结合段 有限元模拟 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]