Experimental study on bearing capacity and ductility of reinforced concrete beam in multi-aggressive and loading coupling

Abstract:

A simulative experiment was carried out for researching the influence of freeze-thaw cycles,chloride penetration,sulfate penetration and loading on the bearing capacity and deformation of the reinforcement members.The residual bearing capacity of normal section of bond strength,ductility and failure mechanism of loading-erosion beams,unloading-erosion beams and unloading-non-erosion beams was were discussed.The experimental results show that the coupling effect of loading and aggressive environment accelerate the degradation of mechanical properties and ductility of beams,and the higher the loading,the more the degradation.The failure forms of reinforcement concrete beam changes from ductile failure to brittle failure under the condition of 70%Fu loading.When to predict the bearing capacity and service life of reinforcement structure,the coupling effect of loading and aggressive environment should be concerned.The experimental results also show that the transverse crack is an influential factor for residual bearing capacity,so the durability of beams with transverse cracks and heavy load under the aggressive environment should be paid more attention.