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为研究空腹式连续刚构桥新型桥梁结构角隅节点的力学性能,设计了角隅节点1∶5缩尺模型试验梁。通过静力荷载试验,利用静态采集仪及挠度计,测试角隅节点模型梁悬臂加载状态下的应变和挠度。建立模型梁有限元空间数值模型,并将有限元数值计算结果与试验数据进行对比分析。研究结果表明:空腹式连续刚构桥角隅节点具有区别于传统斜腿刚构桥角隅节点的力学性能,其顶板顺桥向基本受压应力作用;角隅节点区域局部应力较高,应加强此部位设计;剪力滞效应也同样存在于角隅节点部位;数值模拟结果与试验结果基本一致。本研究进一步揭示了空腹式连续刚构桥角隅节点力学性能,验证了数值模拟的可行性,为今后此类该桥型角隅节点设计提供了借鉴。
In order to study the mechanical properties of the corner bridge of a new type of bridge structure of continuous rigid frame bridge, a 1: 5-scale model test beam with corner nodes was designed. Through the static load test, static strain gauge and deflection meter were used to test the strain and deflection of cantilever beam under corner loading. The finite element numerical model of the beam was established, and the numerical results of the finite element analysis were compared with the experimental data. The results show that the corners of the webs of continuous rigid frame bridge have the mechanical properties that are different from those of the traditional rigid-frame rigid-frame bridge. The roof is subject to the basic compressive stress along the bridge. The local stress in the corner joints is high. Strengthen the design of this part; the shear lag effect also exists in the corner node; the numerical simulation results are in good agreement with the experimental results. This study further reveals the mechanical properties of the corners of a fast-acting continuous rigid frame bridge, validates the feasibility of numerical simulation, and provides reference for the design of such a bridge-type corner node in the future.