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本文以足尺模型低周反复试验研究一种装配式先张预应力混凝土框架梁端的延性性能,考虑在预应力度和受压区高度一定情况下,箍筋间距、钢筋品种、锚固长度等因素对梁端破坏形态、滞回曲线、位移延性、平均曲率延性、耗能能力等特性的影响。研究表明:该种装配式预应力框架梁端的破坏形式都为延性破坏;试件的滞回曲线均较为饱满,具有一定的耗能能力;缩小箍筋间距对此种框架梁端的延性是有利的;HRB400替换HRB500对梁端延性影响不大;缩短锚固长度对梁端的延性较为不利。
In this paper, the full-scale model of low-cycle test to study the pre-stressed prestressed concrete prestressed concrete beam end of the ductility, considering the prestressed and the height of the compression zone under certain circumstances, the stirrup spacing, steel varieties, anchoring length and other factors The influence of beam failure form, hysteretic curve, displacement ductility, mean curvature ductility, energy dissipation and other characteristics are also studied. The results show that the failure forms of the prestressed composite frame are all ductile failure. The hysteresis curves of the prestressed prefabricated prestressed concrete frames are all full and have some energy dissipation capacity. Reducing the stirrup spacing is beneficial to the ductility of the beam ends. ; HRB400 replacement HRB500 little effect on the beam end ductility; shorten the anchorage length of the beam end ductility is more unfavorable.