组合连续梁桥负弯矩区段抗拔不抗剪连接件布置方案优化

Optimization of Layout Scheme of URSP Connectors in Negative Moment Section of Composite Continuous Girder Bridge

以某钢-混凝土组合曲线连续梁桥为工程背景,采用ABAQUS软件建立负弯矩区节段精细化模型,对采用抗拔不抗剪连接件(URSP连接件)的钢-混凝土组合曲线连续梁桥负弯矩区段的力学行为进行研究,并基于力学行为分析结果进一步优化负弯矩区段连接件布置方案。结果表明:在负弯矩区布设URSP连接件将导致在不同连接件交界处区域,普通栓钉连接件有较大的剪力集中现象。过渡段URSP连接件呈“W”型布置将有效改善普通栓钉连接件剪力集中问题,连接件内力最大值减小17%左右,且对混凝土桥面板拉应力影响仅为2%左右,提出的过渡段设计方案具有必要性和可行性。

Based on the engineering background of a steel-concrete composite curved continuous beam bridge,this paper uses ABAQUS software to establish a fine model of the negative moment section,and studies the mechanical behavior of the negative moment section of the steel-concrete composite curved continuous beam bridge with uplift-restricted and slip-permitted connectors(URSP connectors).Based on the results of mechanical behavior analysis,the layout scheme of the connector in the section with negative bending moment was optimized.The results show that the placement of URSP connectors in the area of negative bending moment will lead to greater stress concentration in the junction area of different connectors.The layout of URSP connectors in transitional section with "W" shape will effectively improve the shear concentration problem of ordinary bolted connectors,reduce the maximum internal force of connectors by about 17%,and affect the tensile stress of concrete bridge panels by only about 2%.The design scheme of transitional section proposed in this paper is necessary and feasible.