Abstract
The application of prestressing steel is restricted in highly corrosive environment area. The behavior of structure changes due to corrosion of prestressing steel, which leads to reduction in strength and it may cause sudden failure. There are many research recommendations to resist corrosion of steel, however the durability of structure shall not be ensured during service life of structure. Fiber Reinforced Polymer (FRP) Tendon is considered as an alternate material due to its corrosive resistance property and high strength. An experimental and numerical analysis carried out to study the deflection behavior of FRP tendon prestressed beam and recommended design guidelines. There are four beam specimens casted and tested in laboratory and 51 experimental results collected from research article to carry out numerical study. The ACI, 2011 [1] recommended generalized deflection calculation for beam by softening the effective moment of inertia curve and also introduced the effect of shift of neutral axis once the member exceeds cracking stress of concrete. Based on experimental and numerical analysis study it is concluded that, the deflection behavior of FRP tendon beam depends on deformability of material, degree of prestressing and bond strength. Design chart proposed for calculation of effective moment of inertia and effective neutral axis distance with respect to deformability index. The error percentage of deflec-tion values as per ACI 2011, is about 10 to 20% has reduced to less than 5% in the proposed method.
Highlights
The research on Fiber Reinforced Polymer (FRP) as an alternate material for steel was started during 1950
The proposed deflection calculation method is based on the deformability index and it is calculated based on the ratio of strain at ultimate stage to the strain at prestressing stage
The moment of resistance of member using Carbon fiber reinforced polymer bars (CFRP) tendon at ultimate stage is approximately same irrespective to the degree of prestressing of member which leads to change of deflection curve with respect to degree of prestressing
Summary
The research on FRP as an alternate material for steel was started during 1950. The usage of FRP was restricted due to its lack of ductile behavior, production of non-consistent property and risk of health and environment contamination. Due to the further continuous research during the past decade, different types of chemicals treated FRP bars with acceptable market standard and international code requirements have developed. FRP bars are widely used in corrosive environment areas due to their non-corrosive, high strength to weight proportion and fatigue properties. Carbon fiber reinforced polymer bars (CFRP), Glass fiber reinforced polymer bars (GFRP) and Aramid bars are widely used in Underground Structure, Marine Structure and Bridges. American Concrete Institute-ACI 440 recommended material manufacturing and testing methods and design guidelines for the FRP bars
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