主梁间距与横梁间距对双工字组合梁桥力学性能影响研究

Effect of Girder Spacing and Beam Spacing on Mechanical Properties of Twin I-girder Composite Bridge

双工字钢-混组合梁桥由于其对材料性能的充分利用和简洁的构造形式,在中小跨径梁桥中已成为非常具有竞争力的桥型。工字主梁间距与横梁间距是双工字组合梁桥设计的关键因素,因此,设计了5种不同的主梁间距与横梁间距来研究其对双工字组合梁桥结构性能的影响情况;采用有限元软件ANSYS建立相应的3D有限元桥梁模型进行了数值研究。研究结果表明:横梁主要作用是保证主梁间传递荷载和结构整体稳定性,适当密度的横梁是桥型优化的关键;主梁间距对桥面板的受力情况影响显著,但需要控制悬臂端长度与内侧长度的比值。

Due to the full use of material properties and simple structure,duplex steel-concrete composite beam bridge has become a very competitive bridge type in medium and small span beam bridges.The spacing of I-girders and the number of beams are the key factors in the design of duplex composite bridges.Therefore,five kinds of girders spacing and number of beams were designed to study the influence of these two parameters on the structural performance of duplex composite bridge;The corresponding 3D finite element bridge model was established by ANSYS for numerical research.The numerical results showed that the main function of the beam was load transfer among the main beams and ensure the overall stability of the structure so that the beam with appropriate density was the key of the bridge type optimization;The spacing of the main beams had a significant effect on the stress of the bridge deck,so it is necessary to control the ratio of the cantilever end length to the inner length.