钢管加固既有短柱桥墩轴压承载力计算研究

Research on Bearing Capacity of External Steel Tube Reinforced Existed Ferroconcrete Column

采用外套钢管加固既有钢筋混凝土柱是工程中常用的加固技术,国内外对其加固后结构的承载力计算理论研究较少。针对情况1(原柱混凝土在加固前完全卸载或初始应力较低)从极限平衡理论的角度出发分析加固构件的受力特征,推导出短柱桥墩加固后结构的轴压承载力的计算公式,并与试验的数据相对比,两者符合较好,可为工程实际加固墩柱承载力计算分析提供支持。

The existed concrete column reinforced by external steel tube is a common reinforcement technique and widely used in engineering. However, the computational theory on bearing capacity of the reinforced structure is insufficient at present. In the condition that completely unloading before the existed column concrete is reinforced or the initial stress level is low, the mechanics characteristics of reinforced components are analyzed based on the limit equilibrium method, and then the computational equations of the bearing capacity subjected to axial loading after the short column pier reinforced of structure have been deduced. Comparing the calculation results with the correspondent experimental data shows that the deduced equation can provide a reasonable result for predicting the axial bearing capacity, which provides a support for the computation of the bearing capacity for the reinforcement pier in practice.