新型完全剪切连接钢筋混凝土组合扁梁受力性能试验

Experimental study on the loading capacity of a new shape reinforced concrete composite slim beam with full shear connection

对一种新型钢筋混凝土组合扁梁—U形外包钢钢筋混凝土组合扁梁的受力性能进行了试验,共完成5根不同剪力连接形式的简支梁静荷试验,其中2根为部分剪力连接试件,3根为完全剪力连接试件。研究了不同的抗剪连接形式对组合扁梁整体工作性能和受力性能等方面的影响,对该组合扁梁的抗弯刚度和承载力进行了理论分析。结果表明,该组合扁梁具有良好的力学性能,在完全剪切连接情况下,该组合扁梁的截面应变近似符合平截面假定,抗弯刚度和承载力的计算可以忽略外包钢和其内部混凝土之间滑移效应的影响,其理论计算值与试验结果吻合良好。

A new type of steel-encased concrete composite slim beam are investigated experimentally and theoretically in this paper, including three simply supported beams with full shear connections and two simply supported beam with part shear connections. Good agreement is obtained between the theoretical analysis and the experimental results for bending capability and flexural stiffness of the composite sections. And how to influence the load property of steel-encased concrete composite slim beams about some longitudinal shear constructions are investigated. The research shows that the composite slim beams is good at property of load; and that the theoretical bending capability and flexural stiffness ignoring the influence of slip is well consistent with test results, because the distribution of strains along the section depth in the middle span accords with the horizontal section assumption.