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为了解预加力对预应力混凝土桥梁抗弯刚度的影响程度,针对预应力混凝土结构开裂前后受拉区纤维抗拉能力有显著差异的特点,同时考虑到无黏结预应力混凝土梁的可重复张拉和试验数据的可比性,设计制作了2片无黏结预应力混凝土试验梁,详细测试在钢绞线位置、面积不变,不同预加力对无黏结预应力混凝土构件开裂前后控制截面应力和位移变化的影响。试验结果表明:对于未损伤的无黏结预应力混凝土结构,预加力的变化对结构抗弯刚度影响不显著,但对于已经开裂的无黏结预应力混凝土,预加力的变化对结构抗弯刚度有非常显著的影响;研究成果可为今后旧桥安全评估和加固设计、有关规范的完善,以及预应力混凝土干接梁推广实施提供参考。
In order to understand the influence of pre-applied force on the flexural rigidity of prestressed concrete bridges, the tensile strength of the pre-stressed concrete structures is significantly different before and after cracking, and considering the repeatable Pull and test data comparability, design and manufacture of two unbonded prestressed concrete test beam, a detailed test of the strand position, the same area, different pre-stress on the unbonded prestressed concrete components before and after cracking control section stress and Influence of displacement change. The experimental results show that the prestressing force has no significant effect on the flexural stiffness of the unbonded prestressed concrete without damage. However, for prestressed concrete that has been cracked, the change of pre-stress on the flexural rigidity of the structure The results of the research can provide reference for the safety assessment and reinforcement design of old bridges in the future, the improvement of relevant norms and the popularization and implementation of prestressed concrete dry-laid beams.