预应力钢与高强混凝土组合梁的变形计算分析

在承受荷载过程中,组合梁交界面存在的相对滑移对组合梁的承载力、变形及抗震性能有着重要影响·为了对预应力钢与高强混凝土组合梁的受力性能做出正确评价,根据其实际受力特征,分别利用换算截面法和虚功原理建立组合梁在完全交互作用及滑移影响下的变形计算公式,分析了在对称集中荷载和均布荷载作用下交接面相对滑移对组合梁变形的影响,理论公式的计算结果与试验结果吻合良好,进一步说明交接面滑移会使组合梁的变形增加10%以上·

Deformation Calculation of Prestressed Steel Composite Beams with High-Strength Concrete

Under the action of bearing load, the relative slip at interface between steel beam and concrete of a composite beam affects greatly its bearing capacity, deformation and resistance to shock. In order to evaluate correctly the load-bearing performance of a prestressed steel composite beam with high-strength concrete, the equivalent cross-sectional area and virtual work principle are taken into account to derive the calculation formulas of deformation of the composite beam according to actual loading conditions, including all interactions between different forces and the effect of slip at interface. Analyzes the effect of relative slip at interface on the deformation of the composite beam under symmetric concentrated load and/or uniform load. The calculated result is verified in good conformity with test result, and shows that the slip at interface can increase the deformation of the composite beams by over 10 percent.