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为研究折线配筋先张梁的疲劳受力性能,对2根折线配筋先张梁和1根后张有粘结预应力混凝土梁进行了等幅疲劳试验,并对未发生疲劳破坏的试验梁进行了静载试验,探讨疲劳加载对其剩余静载承载力的影响.试验结果表明,折线配筋先张梁疲劳破坏始于底部受拉非预应力钢筋的脆性断裂;疲劳加载过程中钢筋应变、混凝土应变、裂缝宽度、挠度均有不同程度的增长,呈现“三阶段”变化规律;前期的疲劳加载对试验梁受力性能影响较小,试验梁正截面受弯破坏,有明显的延性破坏特征,其承载力与现行规范计算值相比有一定的安全储备.
In order to study the fatigue behavior of pre-tensioned beam with fold-line reinforcement, constant-amplitude fatigue tests were carried out on two prestressed beams with crease lines and one post-tensioned prestressed concrete beam. The fatigue failure test The static load test is carried out to investigate the effect of fatigue loading on the remaining static load carrying capacity.The test results show that the fatigue failure of the pre-tensioned beam of crease reinforcement starts from the brittle fracture of the bottom prestressed non-prestressed steel bar, Strain, concrete strain, crack width and deflection all have different degrees of growth, showing the variation of “three stages”. The previous fatigue loading has little effect on the test beam’s behavior, and the test beam’s normal section is damaged by bending with obvious ductility Damage characteristics, the bearing capacity compared with the current standard calculated value of a certain safety reserves.