土木工程外文文獻翻譯--決定用frp筋制作的預應力混凝土構件的長期行為的方法

1、附錄 附錄 A 科技文獻翻譯 科技文獻翻譯原文 原文Construction and Building Materials Volume 21, Issue 5 , May 2007, Pages 1052-1060 An approach to determine long-term behavior of concrete members prestressed with FRP tendonsAbstractThe combi

2、ned effects of creep and shrinkage of concrete and relaxation of prestressing tendons cause gradual changes in the stresses in both concrete and prestressing tendons. A simple method is presented to calculate the long-

3、term prestress loss and the long-term change in concrete stresses in continuous prestressed concrete members with either carbon fiber reinforced polymer (CFRP) or aramid fiber reinforced polymer (AFRP) tendons. The met

4、hod satisfies the requirements of equilibrium and compatibility and avoids the use of any empirical multipliers. A simple graph is proposed to evaluate the reduced relaxation in AFRP tendons. It is shown that the prestre

5、ss loss in FRP tendons is significantly less than that when using prestressing steel, mainly because of the lower moduli of elasticity of FRP tendons. The long-term changes in concrete stresses and deflection can be eit

6、her smaller or greater than those of comparable girders prestressed with steel tendons, depending on the type of FRP tendons and the initial stress profile of the cross-section under consideration. Keywords: Creep; FRP;

7、 Long-term; Prestress loss; Prestressed concrete ; Relaxation; Shrinkage NomenclatureA area of cross section d vertical distance measured from top fiber of cross section - 3 -1 transformed section at t0 c concrete

8、 cc net concrete section f FRP reinforcement or flange p prestressing FRP tendon ps prestressing steel tendon s steel reinforcementArticle OutlineNomenclature 1. Introduction 2. Relaxation of FRP prestressing tendon

9、s 3. Proposed method of analysis 3.1. Initial steps 3.2. Time-dependent change in concrete stress 3.3. Long-term deflection4. Application to continuous girders 5. Development of design aids 6. Illustrative example 7. Sum

10、mary Acknowledgements References1. IntroductionThe use of fiber reinforced polymer (FRP) tendons as prestressing reinforcements have been proposed in the past decade and a few concrete bridges have already been construct

11、ed utilizing fiber reinforced polymer (FRP) tendons. Compared to conventional steel prestressing tendons, FRP tendons have many advantages, including their noncorrosive and nonconductive properties, lightweight, and high