主梁体系对中小跨空腹上承拱桥受力影响研究

Study on the Influence of the Girder System on Stress of Hollow Deck Arch Bridge with Medium or Small Spans

摘要:

空腹上承式拱桥的拱上建筑通常由拱上立柱和桥面系（主梁）组成，而主梁通常采用简支梁或连续梁体系。对于不同的体系，主梁与拱上立柱、拱圈的联合作用不同。为研究不同主梁体系对于空腹上承式拱桥受力的影响，以深圳市某中跨空腹上承式钢结构3连拱桥为例，对比4种不同类型的主梁体系方案，并采用MIDAS Civil 2023 V1.1建立全桥分析模型，对不同方案的桥梁结构内力、位移、动力特性及整体稳定性进行计算比较。研究结果表明：当主梁体系采用方案二的3联布置形式时，主拱受力较佳，主拱、主梁横向位移控制较小，且梁-拱的联合作用较强，整体稳定性好，但此时需要重点关注主梁下部墩、柱的受力情况。

Abstract:

The arch structure of the hollow deck arch bridge is usually composed of arch column and bridge deck system (girder). Usually the simple-supported beam or continuous beam system is used for the girder. For different systems, the joint function of the girder with the arch column and the arch ring is different. To study the influence of different girder systems on the stress of the hollow deck arch bridge, taking a mid-span hollow deck steel structure three-arch bridge in Shenzhen as an example, four different forms of girder system schemes are compared. And a full bridge analysis model is established using MIDAS Civil 2023 V1.1 to compare and calculate the internal forces, displacements, dynamic characteristics and overall stability of the bridge structure for different schemes. The research results indicate that when the triple arrangement form of scheme Ⅱ is adopted for the girder system, the girder stress is better, the lateral displacement control of the main arch and the girder is relatively small, and the joint function of girder and arch is stronger. The overall stability is good. But it is necessary to pay special attention to the stress situation of the lower piers and columns of the girder.