应用Goodman弹性夹层法对双层组合梁弹性阶段变形的理论分析

将混凝土板与钢梁的接触面模拟成Goodman非线性弹性夹层,用Goodman弹性夹层法分析双层组合梁在弹性工作阶段的滑移及挠度与荷载之间的关系。通过引入边界条件计算出梁在该约束条件下的滑移规律。用有限元软件ANSYS建立2跨双层连续组合梁的空间模型对该方法的准确性进行验证。计算结果表明,当荷载较小时采用解析法和有限元法计算上层混凝土的界面滑移和挠度值非常接近,两者之差小于7%,该解析法对双层梁在弹性阶段的挠度及滑移变形分析是可行的。

Theoretical Analysis of Double Composite Beam Deformation in Elastic State by Goodman Elastic Sandwich Method

The interface between concrete slab and steel girder was simulated as Goodman nonlinear elastic sandwich.The relationship between the slip,deflection and load of double composite beam in elastic state was analyzed by Goodman elastic sandwich method.The slip law of the girder under the restraint condition was calculated by introducing different boundary conditions.A 3-D model of 2-span double continuous composite beam was established by using ANSYS software to validate the accuracy of this method.Calculation results show that the values of the interface slip and the deflection of the upper concrete slab obtained by analytic method are similar to those gained by finite element method when the beam is under less load.The difference between the results gained by these two methods is less than 7%.The analytic method is feasible in analyzing the slip and deflection deformation of double composite beam in elastic state.