Study Of Bearing Capacity Of Reinforced Concrete Short Column Strengthened By Circular Steel Tube Under Axial Loading Considering Twice Loading

The main characteristic of seismic damage of reinforced concrete bridge pier damage injury lead to serious damage or even collapse, cause huge economic losses and casualties, at the same time, rebuild or repair the bridge and bridge traffic will lead to a period of time, have a significant impact on earthquake relief work. So the damage of reinforced concrete bridge piers quick fix quickly restore the traffic network, ensure the timely in earthquake relief work, and save the post-disaster reconstruction funds has the vital significance.Currently reinforced concrete piers reinforcement technology application is more steel tube reinforcement method, however the researches on the steel tube reinforced concrete emphasis on the once-loading member, Without considering the original axial load before strengthening in actual project. This article focuses on the effects of different original axial load before strengthening to enforced concrete short column strengthened by circular steel tube.To study the basic mechanical performance of reinforced concrete short column strengthened by circular steel tube considering the twice loading,one unstrengthened reinforced concrete column and four reinforced concrete columns strengthened by circular steel tube are tested under axial loading,and post prestressing force was supplied to three of the strengthened columns to simulate the original axial load before strengthening.Then,based on the experimental parameters,the numerical model of FEA is set up to imitate themechanical performance of strengthened column under different axial compression ratio.At last,a formula of strengthened column bearing capacity considering the twice loading is derived.This paper studies the main results obtained are as follows:1、Experimental study on concrete filled steel tubular jacket by strengthening the role of the original reinforced concrete structure, focusing on the analysis discussed in the course of the experiment with different initial axial compression ratio of reinforced concrete,steel casing stress and strain changes, and steel casing Reinforced Concrete Short Columns shaft heart compression failure mechanism.2、On the basis of existing research, the definition of steel casing Reinforced concrete structures axial compressive capacity formula,and experimental data to derive the forces under Secondary reinforcement steel casing pressure bearing capacity of reinforced concrete short axis formula.3、Using ANSYS finite element software to establish a finite element model of steel casing Reinforced Concrete Short Columns by computer simulation and analysis of experimental results and theoretical analysis with similar conclusions; and use ANSYS for more than the initial axial compression different Numerical simulation of reinforced concrete column axial compression,verified the practicality of secondary steel casing under the forces reinforced pressure bearing capacity of reinforced concrete short axis by the formula.