钢-混凝土组合梁桥徐变的三维虚拟层合元分析

摘要

采用三参数粘弹性模型,对钢-混凝土组合梁桥在长期荷载作用下的徐变性能进行了研究,并采用三维虚拟层合单元法研究这种效应以及截面由不同材料组成时结构的受力特点.在实验研究的基础上,拟合了粘弹性模型中的参数,并对钢-混凝土组合梁桥在长期荷载作用下的竖向变形和轴向应变进行了研究,通过对计算和试验结果进行对比分析验证了该法的准确性.%This paper proposes a three-parameter viscoelastic model for studying the time-dependent behavior of steel-concrete composite girder bridges. The method of three-dimensional virtual laminated element(3D-VLE) was developed to analyze the effects and consider the different material properties on the cross-section. After the evaluation of the parameters, which was based on the experimental measurements, the prediction curves accounting for time-dependent behavior of the deformations and strains of the steel-concrete composite girder bridges were obtained. The correlation studies between the analytical and experimental results were conducted with the objective to establish the validity of the proposed model.