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对一组配置芳伦纤维增强塑料AFRP预应力筋的简支梁进行受弯试验,考察AFRP筋配筋率、张拉控制应力、非预应力钢筋配筋率等因素对构件承载能力的影响,分析了开裂荷载、极限荷载、荷载-挠度关系、裂缝发生发展、平截面假定、AFRP筋和普通钢筋的应变发展状况等。试验结果表明:有粘结预应力AFRP筋混凝土梁的受载全过程可分为三个阶段,即从加载到混凝土开裂,再到非预应力筋屈服,最终达到极限承载力;虽然AFRP筋材没有屈服点,但是其弹性模量较低,因此,试验梁破坏前有明显的变形和预兆;破坏时,AFRP筋应变不一定达到极限,其值可按平截面假定计算;此外,试验表明,适当提高张拉控制力能提高梁的极限承载能力。
A group of simply supported beams with AFRP prestressing tendons were tested for flexural behavior. The effects of factors such as reinforcement ratio, tension control stress and non-prestressed reinforcement ratio on the bearing capacity of members were investigated. The cracking load, ultimate load, load-deflection relationship, development of cracks, the assumption of cross-section and the strain development of AFRP bars and ordinary bars were analyzed. The experimental results show that the whole process of loading RC beams with prestressed AFRP tendons can be divided into three stages, from loading to concrete cracking to yielding of non-prestressed tendons and finally reaching the ultimate bearing capacity. Although AFRP tendons There is no yield point, but its modulus of elasticity is low. Therefore, there are obvious deformations and warning signs before the failure of the test beam. When the failure is underway, the strain of the AFRP tendon does not reach the limit, and its value can be calculated according to the plane section assumption. Appropriately increasing the tension control can improve the ultimate bearing capacity of the beam.