Experimental Study on Bending Performance of Steel-concrete Composite Section of Long-span Continuous Beam Bridge
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摘要:
为探究钢-混结合段的受力特征，设计制作了缩尺比为1∶3的主梁钢-混结合段试验模型（长×宽×高：6.0 m ×1.722 m ×2.0 m），并进行了四点弯曲负弯矩受弯性能试验，分析比较了不同荷载加载工况作用下钢-混结合段的受力情况和传力机理，基于模型试验，采用ABAQUS软件对钢-混结合段进行数值分析.研究结果表明：在正常加载和超加载工况下，钢-混结合段各构件应力水平较低，结合段具有较高的安全储备，结合段承载能力满足设计要求，钢箱与混凝土之间共同受力性能良好，钢-混结合段钢顶板、底板和UHPC层所承担的弯矩由钢梁过渡段经承压板向钢-混结合段传递过程中逐渐减小，传力流畅.试验模型钢-混结合段主要由承压板承担荷载，荷载分担比例合理.
Abstract:
In order to explore the stress characteristics of the steel-concrete joint section， an experimental model of the steel-concrete joint section of the main beam with a scale ratio of 1∶3 （long × wide × height： 6.0 m × 1.722 m × 2.0 m）， and the four point bending negative moment bending test was carried out， and the stress condition and force transfer mechanism of the steel-concrete joint section under different load conditions were analyzed and compared， Based on the model test， ABAQUS is used to analyze the steel-concrete joint section. The research results show that under normal loading and over loading conditions， the stress level of each component in the steel-concrete joint section is low， the joint section has strong safety reserves， the bearing capacity of the joint section meets the design requirements， and the common stress performance between the steel box and the concrete is good. The bending moment borne by the steel top plate， bottom plate and UHPC layer of the steel-concrete joint section gradually decreases during the transmission from the steel beam transition section through the pressure bearing plate to the steel-concrete joint section， and the force transmission is smooth. The steel-concrete joint section of the test model is mainly loaded by the bearing plate， and the load sharing proportion is reasonable.
