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为了研究预应力分期张拉技术对混凝土梁预应力损失、承载能力和挠度等特性的影响,针对后张法预应力混凝土梁,考虑混凝土龄期、张拉方式等因素的影响,进行了预应力混凝土矩形梁分期张拉技术试验研究。对混凝土矩形梁分别在4,8,12d龄期进行分期张拉并在28d龄期进行一次张拉,之后对其进行连续30d的预应力损失监测,并对各梁体往复承载能力、挠度和破坏形态等展开了研究。结果表明:对混凝土梁体进行早龄期的预应力分期张拉可以有效减少混凝土的后期预应力损失,提高梁体开裂荷载和屈服荷载,且并不影响梁体受弯延性破坏形态。
In order to study the influence of prestressed staged tensioning technology on the characteristics of prestressed concrete beams, such as prestress loss, bearing capacity and deflection, the influence of prestressed concrete beams with post-tensioned method, concrete ages and tensioning methods, Experimental study on staged tensioning of concrete rectangular beam. The rectangular concrete beams were staged at 4, 8, 12 days and tensioned at 28 days respectively. Then the prestressed concrete slabs were monitored continuously for 30 days. The reciprocating load capacity, Destruction of morphology, etc. launched a study. The results show that prestressing prestressed concrete beams can effectively reduce the post-construction loss of prestressed concrete and increase the cracking load and yield load of the concrete beams without affecting the ductile failure modes of the beams.