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Numerical Simulation of Flexural Behavior of Corroded Reinforced Concrete Beams

WANG Xiao-gang,GU Xiang-lin,ZHANG Wei-ping (Department of Building Engineering,Tongji University,Shanghai 200092,China)  
A discrete finite element model was built using DIANA software,which was proved appropriate for analysis of flexural behavior of corroded reinforced concrete beams when combining with degradation model of corroded steel bars and steel-concrete interface through available research results.Further analysis was then carried on to investigate the transition from beam action to arch action of corroded reinforced concrete beams and flexural behavior of corroded beams with non-uniform corrosion distribution along longitudinal steel bars.The results show that the load carrying mechanisms of corroded reinforced concrete beams change from beam action to arch action if adequate anchorage is provided for tensile longitudinal steel bars,which is caused by bond failure in shear span and leads to decrease of flexural stiffness by 34%~44% under service load.Corroded reinforced concrete beams with non-uniform corrosion can be equated to uniformly full-span corroded beams in mechanical performance evaluation,the maximum value of the non-uniform corrosion distribution should be used for calculation of load carrying capacity,and the average value should be used for stiffness calculation.
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