Calculation and Analysis for Limit Bearing Capacity of Steel Tube Reinforced Short Column Piers by Limit Equilibrium Method

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 the existed column concrete before completely unloading is reinforced or the initial stress level is low, the mechanics characteristics of reinforced components were 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 structure had been deduced. Comparing the calculation results with the correspondent experimental data shows that the deduced equation can provide reasonable results for predicting the axial bearing capacity, which provides a support for the computation of the bearing capacity for the reinforcement pier in practice.