Experiment Research On The Fatigue Behavior Of Stainless Steel Reinforced Concrete Slabs

Poor anti-corrosion property is the fatal weakness of ordinary steel reinforcement embedded in concrete, which can easily be corroded. As the results, the service life of the structure was shortened. Study found that the stainless steel bar which apply in reinforced concrete structures of civil engineering were considered as one of the effective ways to combat the durability problems associated with corrosion environment.In this paper, based on the tests of two stainless steel reinforced concrete slabs and one ordinary reinforced concrete slab, the influence of reinforced varieties and reinforcement ratio on the bearing capacity, deflection, steel strain and crack were studied. Based on the fatigue tests of four stainless steel reinforced concrete slabs and one ordinary reinforced concrete slab, the influence of stress level, reinforced varieties and reinforcement ratio on the fatigue life, deflection, steel strain and concrete strain were studied.Main conclusions of test are as follows:(1)With the increase of reinforcement ratio, the ultimate bearing capacity of the specimen increase and steel strain decreases. Comparing with the ordinary reinforced concrete slab, the ultimate bearing capacity of stainless steel reinforced concrete slab are decreased by13.8%when they under the same condition. The strain of stainless steel is5.31times of ordinary steel when the specimens were broken.(2)It shows that the crack width of SSRCS can meet the requirement of the maximum crack width in Code for Design of Concrete Structures (GB50010-2010). Based on the results found, it is suggested that the ultimate bearing capacity and mid-span deflection need to be corrected for reasonable estimation.(3)Because of the residual deflection and residual strain, the mid-span deflection, tensile steel strain and concrete strain are increasing with the increase of cycling times.(4)When the specimens have the same reinforcement ratio, the greater stress level, the greater deflection, steel strain, concrete strain and crack width, and the shorter fatigue life. With the increasing of reinforcement ratio, the deflection, steel strain and concrete strain is decreasing, stiffness decrease is slower and fatigue life is extending. (5)Comparing with the stainless steel reinforced concrete slab and the ordinary reinforced concrete slab which are the same reinforcement ratio and stress level, deflection was reduced by13.03%～30.27%and the steel strain was reduced by16.96%-46.76%, concrete strain was reduced by29.63%～8.9%, and the fatigue life is significantly higher than the ordinary reinforced concrete slab.(6)To study the design methods and application of stainless steel concrete slab, obtain the S-N curve and the formula express.