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采用弱形式求积元法对界面滑移钢-混凝土组合梁的剪力滞及收缩徐变效应进行了计算分析。通过与现有试验及有限元结果的比较,验证了弱形式求积元方法的准确性和高效性。进一步的参数化研究表明,混凝土板宽度与组合梁跨度之比小于0.6时,剪力滞效应对含简支边界条件组合梁的时变效应影响明显。当剪力连接刚度水平较低时,由于时变效应引起的钢-混凝土组合梁的挠度相对变化将随剪力连接刚度的增大显著提高。
The shear lag and the shrinkage and creep effect of the interfacial-slip steel-concrete composite beam are calculated by using the weak form quadrature method. The accuracy and efficiency of the weak form quadrature method are verified by comparison with the existing experiments and finite element results. Further parametric studies show that the shear lag effect has a significant effect on the time-varying effect of composite beams with simply supported boundary conditions when the ratio of the width of concrete slab to the span of composite beam is less than 0.6. When the shear connection stiffness is low, the relative deflection of the steel-concrete composite beam due to the time-varying effect will increase significantly with the increase of the shear connection stiffness.