论文部分内容阅读
预应力钢筋混凝土连续箱梁桥跨中下挠是该桥型普遍存在的典型病害,引起跨中下挠的成因十分复杂,往往是多种因素相互耦合,很难精确计算。本文结合工程实例,通过模拟计算结果与检测病害的拟合分析,讨论了混凝土收缩徐变、预应力损失及刚度削弱对跨中下挠的影响,提出了跨中刚度折减形成跨中下挠的一种合理假设,可作为此类桥型分析的一个分析方向。
The mid-span deflection of prestressed RC continuous box-girder bridge is a typical disease of this bridge type. The cause of the mid-span deflection is very complicated. It is often a result of many factors being coupled with each other and difficult to calculate accurately. Based on the engineering examples, the influence of the shrinkage and creep of concrete, the loss of prestress and the weakened rigidity on the mid-span deflection are discussed through the fitting analysis of the simulation results and the detected diseases. The mid-span deflection A reasonable assumption that can be used as an analytical direction for such bridge analysis.