抗剪连接程度对组合梁受力性能影响

Effect of Shear Connection Degree on Mechanical Behavior of Composite Beams

为研究不同抗剪连接程度的钢-混凝土组合梁的受力状况,首先建立了组合梁的有限元模型进行计算,并通过4片试验梁检验其有效性和正确性。随后采用正交设计方法,选取焊钉数量、直径、长度和材料强度等因素对组合梁受力状态进行了参数分析。最后对抗剪连接程度的影响进行讨论,拟合得到不同连接程度下组合梁抗弯承载力和梁端滑移的计算公式。研究结果表明,焊钉数量和直径对组合梁界面滑移的影响最为明显;拟合公式能够较为准确地计算得到不同连接程度组合梁的承载力和梁端滑移;在桥梁工程中,由于连接件的数量通常是由构造要求决定的,故组合梁界面滑移的限值通常不控制设计。

In order to study the mechanical behavior of steel-concrete composite beams with different shear connection degree,finite element models of composite beams are established.In addition,the validity and correctness of models are verified by four beam tests.Moreover,factors such as the number,diameter,length and material strength of the studs are selected to conduct the parametric study,by using the orthogonal test method.Furthermore,the influence of shear connection degree is discussed and the fitting formulas of bending capacity and end slip of composite beams are obtained.The results show that the number and diameter of studs have the most significant effect on the interface slip of composite beams.In addition,the bending capacity and beam end slip of composite beams with different connection degrees can be accurately predicted using fitting formulas.Moreover,in bridge engineering,as the studs are usually distributed according to structural requirements,the limit value of interface slip is not the controlling factor when designing composite beams.