箱形截面钢-混凝土组合连梁的抗震性能

Seismic performance of box⁃section steel⁃concrete composite coupling beam

对一种箱形截面钢-混凝土组合连梁展开研究,通过有限元模拟和理论分析对其屈服模式、抗震性能进行了深入探索。对不同参数取值下组合连梁的屈服模式进行对比分析,基于组合连梁长度与屈服承载力的关系,给出屈服模式的判定准则,研究了不同参数对组合连梁屈服模式的影响规律。结果表明:减小截面高度、钢腹板高厚比、钢材屈服强度、混凝土强度,增大剪跨比、钢翼缘宽厚比、截面高宽比等措施均使耗能梁段更容易弯曲屈服。轴向受压时,弯曲屈服型构件的延性普遍优于剪切屈服型构件;轴向受拉时,剪切屈服型构件的延性优于弯曲屈服型构件。剪切屈服型构件的弹性段刚度、屈服荷载、极限荷载以及能量耗散系数普遍大于弯曲屈服型构件。

A research on a box⁃section steel⁃concrete composite coupling beam was carried out.Through finite element simulation and theoretical analysis,the yield mode and seismic performance were thoroughly explored.The yield modes of composite coupling beams with different parameters were compared and analyzed.Based on the relationship between the length of the composite coupling beams and the yield capacity,the criterion of yield mode was given,and the influence of different parameters on the yield mode of the composite coupling beam was studied.The results show that tendency of bending yield is enhanced by reducing the section height,steel web height to thickness ratio,steel yield strength,concrete strength,and increasing the shear span ratio,steel flange width to thickness ratio,section height to width ratio.The ductility of bending yield members is generally better than that of shear yield members under axial compression,while the ductility of shear yield members is better than that of bending yield members under axial tension.The elastic stiffness,yield load,ultimate load and energy dissipation coefficient of shear yield members are generally larger than that of bending yield members.