Deterioration Of Corroded RC Eccentric Compressive Member's Flexural Stiffness

RC eccentric compressive member's stiffness will be affected by bar corrosion, at present , there are many studies on corroded beam's stiffness but little on compressive member's stiffness. In order to have a better understanding to the deterioration rule of corroded RC eccentric compressive member's flexural stiffness and present a model to calculate the flexural stiffness, this paper studied corroded RC eccentric compressive member's flexural stiffness by theoretical analysis and experiment based on the summary of existing research. The main work is:1, The distortion property of eccentric compressive member and deducing process of the formula for undamaged member's flexural stiffness were discussed. The primary factors that lead to deterioration of corroded RC eccentric compressive member's stiffness were confirmed by analyze formula and existing research results.2, The influence mechanism of the primary factors that lead to deterioration of corroded RC eccentric compressive member's stiffness were analyzed, and how to dispose the influence was discussed. By referencing the formula of undamaged member's flexural stiffness, the calculation model for corroded RC eccentric compressive member's flexural stiffness was established.3, 15 eccentric compressive experimental members were designed and manufactured to study performance of the corroded by experiment. The experiment process was introduced detailedly. By analyzing the experiment phenomena and experiment results, it's found that when corrosion ratio is little(<6%) bar corrosion has little influence to flexural stiffness ,but with the increasing of the corrosion ratio, the influence become more and more obvious.4, The relevant par阿meter in the calculation model was analyzed and confirmed by referencing experiment results. And the feasibility of the calculation model was proved by test data. 5, The work of the paper was concluded and the direction of further research was discussed.