钢-混凝土组合与叠合双重作用梁负弯矩区刚度和叠合面滑移研究

Analysis of bending stiffness and contact slip of a steel-concrete composite beam with double actions of combination and lamination

  • 摘要: 钢-混凝土组合连续梁由于其负弯矩区混凝土板的开裂制约着组合结构的发展。该文提出一种钢-混凝土组合与叠合双重作用梁,在负弯矩区钢梁上翼缘与混凝土顶板底面的叠合面使用抗拔不抗剪连接件连接,使叠合面在不发生分离的条件下产生自由滑动效应,以释放混凝土板拉应力、降低混凝土板开裂风险。得到了考虑叠合面摩擦抵抗的截面抗弯刚度;采用基本力学原理分析叠合界面在均布荷载和集中荷载分别作用下的滑移和滑移应变,得到了界面滑移和滑移应变沿梁长的分布规律。

     

    Abstract: The application and development of steel-concrete composite continuous beam is haltered due to the cracking of concrete slab in the negative moment zone. A steel-concrete composite beam with double actions of combination and lamination is proposed in this paper, of which the interface between the upper steel flange and the top concrete slab is connected by uplift connectors, which allows for the free sliding in laminated interface in the negative moment region, so that to release the tensile stress in concrete slab and reduce its cracking risk. The bending stiffness of cross section considering the friction resistance was obtained. The contact slip and the slip strain along the interface under uniform and concentrated loads were respectively analyzed, and then the variations of the slip and slip strain with different friction coefficients along the beam length were obtained.

     

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