考虑收缩徐变影响的新旧混凝土叠合梁非线性分析实用方法  

PRACTICAL NONLINEAR ANALYSIS METHOD OF NEW-OLD CONCRETE COMPOSITE BEAMS WITH SHRINKAGE AND CREEP

作　　者：杨维国 许红叶 YANG Weiguo XU Hongye(Department of Railway Engineering Hunan Technical College of Railway High-Speed, Hengyang 421002, Hunan, China)

机构地区：[1]湖南高速铁路职业技术学院铁道工程系,湖南衡阳421002

出　　处：《力学与实践》2017年第4期379-383,共5页Mechanics in Engineering

摘　　要：界面存在粘结滑移的新旧混凝土叠合梁是一种重要的工程梁.以叠合面上的变形协调条件为计算条件,推导出叠合梁以轴力表达的非线性微分方程.求解该微分方程,得到截面协同工作系数理论表达式.通过该截面协同工作系数,建立了能够准确反映新旧混凝土叠合梁承载力与变形的非线性实用分析方法,使得Bernoulli假定与截面协同工作系数达到了统一,并与已有解析解进行了对比分析,发现计算精度满足工程需求,说明了该分析方法的实用性.The new-old concrete composite beams are considered as an important engineering beam with a bond-slip in the composite surface. Based on the deformation compatibility relationship across the composite surface of the new-old concrete composite beam, a nonlinear differential equation is derived, for the axial force of the new-old concrete composite beam. The theoretical expressions of the section coordination coefficient are obtained from the equation. With the coordination coefficient, a practical nonlinear analysis method is established, which can exactly describe the shrinkage and the creep of the new-old concrete composite beams. The Bernoulli assumption and the coordination coefficient of the section are duly combined. Compared with the existing analytical solutions, the accuracy can meet the engineering requirements.

关 键 词：新旧混凝土 叠合梁 收缩 徐变 协同工作系数 实用分析方法 非线性解析解 

分 类 号：TU375[建筑科学—结构工程]