钢-混凝土组合梁剪力滞及时变效应的求积元分析

Long-term quadrature element analysis of steel-concrete composite beams with partial interactions and shear-lag effects

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 time-dependent behavior of steel-concrete composite （SCC） beams with partial interactions and shear-lag effects was analyzed using the weak form quadrature element method （QEM）. The method was shown to be accurate and efficient in comparisons with experimental data and finite element results. The results show that the time-dependent behavior of SCC beams with the pinned boundary condition is strongly affected by the shear-lag effects when the ratio of the slab width to the beam span is less than 0.6. The relative variation of the deflection caused by the time effect is aggravated by the increased shear connection stiffness when tbe shear connectors have relatively lower stiffness.