The Research And Analysis On Axial Compressive Properyt Of Corroded Reinforced Concrete Columns

The issue of the durability of concrete structures is becoming more highly regarded both in domestic and overseas; the destruction of the building due to the durability problem is more serious, which has brought huge economic losses to governments. While there are Complex and diverse factors that affect the structural durability, many variables are of uncertain, all brought great difficulties to the research work. In Which the steel corrosion in reinforced concrete structures is an important factor affecting the durability of concrete structures, while the degradation of the bonding properties between the lower, reinforced concrete section loss and mechanical properties of corroded reinforcement due to corrosion of the steel corrosion product volume increase palling of concrete, etc., all are the main reasons for the reduce of the structural durabilitv.The corrosion of reinforced concrete columns carrying capacity is a very important content of the assessment of structural durability. If Corrosion in reinforced concrete columns reinforced the rust is more serious, the column in the stirrups will be rust off, and make the reinforcement loss of lateral binding, so that the component compressive strength substantially reduced. In order to assess the residual carrying capacity of corroded reinforced concrete columns, we need to calculate the bearing capacity after the corrosion of reinforced concrete columns, to provide a reference for the detection and strengthening of the structure.This article is the research project of the Jilin Provincial Department of Education. Subproject of the reinforced concrete structure of existing housing constructed of reinforcing steel in testing and evaluation "(2012800-611010003), combined with previous work on the basis of design and finished16accelerated corrosion, of the reinforced concrete columns and axial compression bearing capacity test. Two non-corroded contrast columns and14different reinforcement corrosion rate accelerated corrosion of the column16with columns.Through to the reinforced concrete column of electrochemical corrosion test of acceleration, the corrosion of reinforcement concrete column’s corrosion rate control in1%,3%,5%9%,12%,15%,18%, and test the corrosion columns axial compression bearing capacity, get the limit bearing capacity and the load-strain curve after rust, and analyze data, and hope to find between advocate muscle corrosion rate. rust column stirrup, failure pattern, corrosion column under axial strain relevant laws. At the same time in the observation test process, record intuitive phenomenon of test and the varying pattern, which for corrosion of reinforcement concrete columns axial compression performance provide some valuable data, the phenomenon of material.Through the elastic-plastic mechanics theory formula the derivation of corroded reinforced sort out by vertical stress process, reinforced pit corrosion in the production of the stress concentration of the calculation formula of the phenomenon;And analyze model of the rusty steel section stress calculation for the mechanical loss corroded reinforced provides a vivid practical theory calculation basis;Through research corroded reinforced concrete column in the reinforcement corrosion rate and analysis of corroded reinforced concrete column reinforcement corrosion situation of corrosion column limit bearing capacity of the axial compression influence, and the corrosion of the main steel reinforcement and the stirrup is the reason which is cause by reinforced concrete column under axial bearing the deterioration of the performance.Through the damage of the corroded reinforced concrete column section, bearing performance degradation, and other factors, such as the use of corroded reinforced concrete in axial compression bearing capacity by in the process of destruction rules, for simulation of the actual engineering corrosion component the mechanical behavior, and yet to reinforce the stigma of the component failure characteristics, combined with stirrup rust of corroded reinforced concrete column broken the bearing capacity of the influence, calculation of corroded reinforced concrete column the rest of the axial compression bearing capacity of the theoretical basis and method for calculating the checking and discussion, corroded reinforced concrete column for the reinforcement design and durability evaluation, providing some reference.