混合梁刚构桥钢-混结合段局部传力机制试验研究

Experimental Study of Local Force Transmission Mechanism of Steel-concrete Connection in Hybrid Continuous Rigid Frame Bridge

摘要:

设计了3个不同结构构造的钢-混结合段构件，并分析了连接件和后承压板在结合段中的传力机制。结果表明：在1.80倍设计荷载作用下，结合段处于弹性状态；当轴力与剪力分别为设计荷载的4.65倍与1.80倍时，结合段达到弹性极限状态；当轴力为设计荷载的6.65倍时，结合段钢格室混凝土压溃破坏。后承压板是最主要的轴力传递构件，在弹性阶段承担50%~60%轴力，在塑性阶段承担35%~42%轴力。在混合连接方式中焊钉连接件发挥的作用较小，仅开孔板连接件也能实现钢箱壁板与填充混凝土之间的连接和传力作用。

Abstract:

Three specimens of steel-concrete connection with different structures were designed to analyze the effects of connectors and back bearing plates on force transmission in the connection. It is shown that under 1.80 times of the design load， the connection in practical engineering is in the elastic state； when the axial force is 4.65 times of the design load and the shear force is 1.80 times of the design load， the connection reaches the elastic limit state； when the axial force is 6.65 times of the design load， the concrete inside the steel cells in the connection collapses and reaches the failure state. The back bearing plate is the most important component for axial force transmission in the structure. The back bearing plate bears 50%~60% of the axial force in the elastic stage， while the back bearing plate bears 35%~42% of the axial force in the plastic phase. In the mixed joint mode of perfobond plate connectors and stud connectors， the stud connectors played a minor role. The connection and force transmission between the steel box plates and the filled concrete could be realized by only setting the perfobond plate connectors.