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针对国内体外预应力研究较落后的现状,进行了6根体外预应力筋和2根普通钢筋混凝土简支T梁正截面静力加载试验,对其受力过程、破坏形态、承载力、延性和变形情况进行了分析。试验结果表明,体外预应力筋可以大幅度提高混凝土梁的开裂荷载、屈服荷载和极限荷载,延迟裂缝开展,改善梁的正常使用状态;直线束双转向块力筋形式对试件抗裂最为有利,双折线力筋对屈服荷载提高幅度最大,转向块个数能显著提高试件的极限荷载;体外预应力能有效减小构件的变形,延缓钢筋屈服,构件的整体刚度显著提高;体外预应力筋不同布置形式对试件极限承载力和挠度变形影响较大,而预应力张拉方式影响相对较小。
According to the current situation that the research on the external prestress in China is rather backward, the static loading tests of 6 external prestressed tendons and 2 ordinary reinforced concrete simply supported T-beams are carried out. The loading process, failure mode, bearing capacity, ductility and Deformation was analyzed. The test results show that the prestressed tendons can greatly improve the cracking load, yield load and ultimate load of the concrete beam, delay the crack propagation and improve the normal use state of the beam. The tendon form of the straight beam double steering block is most favorable for the crack resistance of the specimen , The yield strength of the biaxial tendon increases to the maximum, and the number of the steering bar can significantly increase the ultimate load of the specimen. External prestress can effectively reduce the deformation of the member, delay the yielding of the steel bar and significantly increase the overall stiffness of the member. External prestress The different arrangement of tendons has a greater influence on the ultimate bearing capacity and deflection of specimens, while the influence of prestressed tensioning method is relatively small.