预应力钢-混凝土组合连续箱梁交界面滑移理论分析

Theoretical Analysis on Interface Slip of Prestressed Steel-Concrete Composite Continuous Box Girder

以3片钢-混凝组合连续箱梁的受弯试验为基础,结合弹性理论提出了一种钢-混凝土组合梁跨中相对滑移的计算方法.该方法考虑了组合梁交界面滑移刚度的影响.试验结果表明:预应力对钢-混凝土组合梁的相对滑移影响较大,且有效预应力越大,作用效果越明显;通过计算值与理论值的分析比较,验证了本试验理论计算的可靠性和精度.

Based on the flexural test of the continuous box girders with three steel-concrete composite beams,a new method for calculating the mid-span relative slip of steel-concrete composite beams is presented in this paper.The influence of the slip stiffness on the interface of composite beams is considered.The test results show that the prestressed is of a great influence on the relative slip of the steel-concrete composite beams,and the greater the effective prestress,the more obvious the effect.By comparing the calculated value with the theoretical value,the reliability and accuracy of the theoretical calculation are verified.