新型外包钢-砼T形截面组合梁滑移性能研究

Experimental Research on the Interface Slip of New Shape Steel-encased Concrete Composite Beams

在新型外包钢-砼T形组合梁中,交界面相对滑移是影响构件受力性能的一个重要因素。为研究其交界面相对滑移性能,通过3根足尺新型外包钢-砼组合梁的试验研究,得到组合梁不同截面的荷载-位移、荷载-滑移关系曲线。根据试验结果分析了新型外包钢-砼组合梁交界面相对滑移的发展过程和分布规律,从理论上建立了新型外包钢-砼组合梁交界面相对滑移微分方程,得到了组合梁交界面相对滑移量的计算公式,并通过试验数据对其进行验证,理论计算结果与试验结果吻合良好。

The interface slip of the new shape steel-encased concrete composite beams greatly affects its working behavior. To research the interface slip character, three full size simple supported samples have been experimented, the load-deflection curves and load-slip curves are established. Based on these results, the interface slip development process and laws are obtained, a differential equation is established for the interface slip, and a calculating formula is obtained for the interface slip through theoretical analysis. Finally, a good agreement is reached between the calculating results and the experimental results.