工字钢近混凝土梁端螺栓剪切性能研究

Study on Shear Performance of Bolts Near Concrete Beam Ends of I-Beams

悬挑式脚手架以其优异的性能(不穿透结构,易于拆卸,可回收利用等)广泛应用于各大施工现场。基于此,本文研究近钢筋混凝土梁端受力时的锚固性能,提出综合考虑不同的预埋位置、预埋深度、混凝土强度对箍筋的疏密的影响,对工字钢近钢筋混凝土梁端的极限承载力进行了有限元分析。结果表明,混凝土破坏是各试件的破坏模式。为了探究工字钢近混凝土梁端螺栓剪切性能,建立了81个有限元模型,采用岭回归线性回归方法对工字钢近钢筋混凝土梁端呈剪切行为时的极限承载力进行了参数化分析。最终得出,混凝土强度和锚固位置对极限承载力的影响较大,锚固深度和箍筋的疏密对极限承载力的影响相对较小,并提出了考虑上述参数的线性拟合承载力预测公式,以便于相关工程进行计算。

Cantilever scaffold is widely used in major construction sites for its excellent performance(non-penetrating structure,easy disassembly,recyclable,etc.).Based on this,the anchorage performance of reinforced concrete beams near the end is studied in this paper,and the ultimate bearing capacity of I-steel beams near the end of reinforced concrete beams is analyzed by finite element method considering the influence of different embedment positions,embedment depths and concrete strength on the density of stirrup.The results show that concrete failure is the failure mode of each specimen.In order to investigate the shear behavior of bolts near the concrete end of I-steel beams,81 finite element models were established and the ultimate bearing capacity of I-steel beams near the concrete end was parameterized by ridge regression linear regression method.Finally,it is concluded that the influence of concrete strength and anchorage position on ultimate bearing capacity is greater,and the influence of anchorage depth and stirrup density on ultimate bearing capacity is relatively small,and a linear fitting bearing capacity prediction formula considering the above parameters is proposed to facilitate the calculation of related projects.