Experiment Research On Axial Compression And Eccentric Compression Capacity Of L-shaped Corroded Reinforced Concrete Columns

Corrosion is one of the main reasons making the reinforced concrete members invalidate. Column is the most important member loaded axially in reinforced concrete structure, so the damage of columns generally leads to severe consequences and brings huge economic losses. Compared with the common square co lumn, L-shaped column has more angular points, making it easier to suffer from the environmental erosion, then inducing degradation in bearing strength and mechanical property. This paper investigated the bearing capacity of axial and partial compression of corroded L-shaped reinforced concrete column in the following aspects:1) In order to investigate the axial compression bearing capacity of corroded L-shaped reinforced concrete column, accelerated corrosion methods were adopted to obtain four test specimens in which both the main reinforcements and stirrups were corroded with different average corrosion rates of 0, 4.05%, 7.44% and 11.08%. Results showed that the corrosion of reinforcement started from the stirrup and corner main reinforcement. Axial bearing capacity tests were conducted to analyze the distribution of corrosive cracks, and the influence of different corrosion rates on failure characteristics and axial compression bearing capacity of L-shaped reinforced concrete column. Existing corroded reinforced concrete capacity models were improved and verified.2) In order to investigate the axial compression bearing capacity of corroded L-shaped reinforced concrete column when merely the main reinforcements were corroded, three test specimens were obtained through epoxying the stirrup and accelerated corrosion methods with different average main reinforcement corrosion rates of 4%, 7.3% and 10.8%. Axial bearing capacity tests were conducted to analyze the distribution of corrosive cracks, and the infl uence of different corrosion rates on failure characteristics and axial compression bearing capacity of L-shaped reinforced concrete column. Results were compared with the results when both the main reinforcements and stirrups were corroded. Improved corro ded reinforced concrete capacity models were verified.3) In order to investigate the eccentric compression bearing capacity of corroded L-shaped reinforced concrete column, accelerated corrosion methods were adopted to obtain four test specimens in which both the main reinforcements and stirrups were corroded with different average corrosion rates of 0, 4.3%, 7.2% and 10.5%. Results proved that the corrosion of reinforcement started from the stirrup and corner main reinforcement. Partial bearing capacity t ests were conducted to analyze the distribution of corrosive cracks and the results were compared with that of the axial compression specimens. The influences of different corrosion rates on failure characteristics and eccentric compression bearing capacity of L-shaped reinforced concrete column were evaluated. The relation curve between bearing capacity and corrosion rate was established based on the results of eccentric compression bearing capacity.