施工期RC框架结构内力与变形规律现场试验研究与数值模拟分析

Field experimental study and FE analysis on internal force and deformation law of RC frame structure during construction

为研究施工期混凝土结构存在的复杂非线性受力和变形规律,本文通过开展结构施工期现场试验来研究钢筋内部约束和构件外部约束影响的非线性结构反应,首先进行了施工期钢筋混凝土结构的现场试验,测量和分析了结构的应力应变变化发展过程,其次进行了基于ABAQUS的非线性数值模型的验证与分析,最后通过参数分析研究了施工期混凝土结构的内力和变形规律。研究结果表明:施工期梁截面温度发展趋势相似,由于约束水平不同,边跨梁截面的应变大于中跨梁截面的应变;施工期框架柱的位移分布接近直线分布形状,但其剪力随着跨数的增多呈现明显的非线性分布规律。

There are complex nonlinear stress and deformation processes in concrete structures during construction.In this paper, field tests are carried out during construction to study the nonlinear processes affected by internalconstraints of reinforcement and external constraints of members. First, the development process of stress and strainof reinforced concrete structures during construction is measured based on tests. Second, the nonlinear numericalmodel based on ABAQUS is verified and analyzed. Finally, the law of internal force and deformation of concretestructure during construction is studied through parameter analysis. The results show that the temperaturedevelopment trend of beam section during construction is similar. Due to different constraint levels, the strain ofside span beam section is greater than that of mid span beam section. During the construction period, thedisplacement distribution of the frame column is close to the linear distribution shape, but its shear force presentsan obvious nonlinear distribution law with the increase of the number of spans.