预应力超高性能混凝土梁抗震性能试验研究

发布时间：2018-12-26 13:29

【摘要】：将高强钢筋用于超高性能混凝土(UHPC),可充分发挥两者的高强性能。为了解预应力度和配筋率对预应力高强钢筋UHPC梁抗震性能的影响,设计制作了3根预应力和1根非预应力UHPC梁,进行低周反复荷载试验,分析各梁的抗震破坏形态、滞回曲线、骨架曲线、延性指标、刚度退化、耗能能力和变形恢复能力,探讨预应力度和换算配筋率对梁抗震性能的影响规律。结果表明:非预应力和中等预应力度UHPC梁具有良好的抗震性能和延性性能,高预应力度UHPC梁具有较好的抗裂能力和变形恢复能力;提高预应力度会降低梁的耗能能力,改善变形恢复能力,但对刚度退化速率影响不大;提高换算配筋率可减缓刚度退化速率,降低梁的耗能能力,但对变形恢复能力影响不大。
[Abstract]:The application of high-strength steel bar to ultra-high performance concrete (UHPC), can give full play to their high-strength properties. In order to understand the influence of prestress degree and reinforcement ratio on seismic behavior of prestressed high-strength UHPC beams, three prestressed and one unprestressed UHPC beams were designed and manufactured. The low cycle repeated load tests were carried out, and the seismic failure patterns and hysteretic curves of each beam were analyzed. Skeleton curve, ductility index, stiffness degradation, energy dissipation capacity and deformation recovery ability are discussed. The influence of prestress degree and conversion reinforcement ratio on seismic behavior of beams is discussed. The results show that UHPC beams with non-prestress and moderate prestress have good seismic performance and ductility, and UHPC beams with high prestress have good crack resistance and deformation recovery ability. Increasing the degree of prestress can reduce the energy dissipation ability of the beam and improve the recovery ability of deformation, but it has little effect on the rate of stiffness degradation, while increasing the conversion ratio of reinforcement can slow down the rate of stiffness degradation and reduce the energy dissipation ability of the beam, but it has little effect on the ability of deformation and recovery.
【作者单位】：北京工业大学城市与工程安全减灾省部共建教育部重点实验室;
【基金】：国家自然科学基金项目(51378032) 北京市自然科学基金项目(8142005)~~
【分类号】：U442.55

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