预应力钢绞线加固混凝土短柱抗震性能研究

发布时间：2018-06-16 10:32

  本文选题：预应力钢绞线 + 短柱　； 参考：《预应力技术》2016年05期

【摘要】：为研究预应力钢绞线加固钢筋混凝土(RC)短柱的抗震特性,对7个试件进行了低周反复加载试验。试验研究了轴压比、钢绞线配置特征值和预应力水平对加固短柱抗震性能的影响。结果表明,预应力钢绞线可有效改善RC短柱的抗震性能,延性和耗能能力显著提高,与未加固试件PC1相比,预应力钢绞线加固短柱的位移延性系数、累积耗能能力最大值分别提高1.87倍和6.78倍,钢绞线配置量及预应力水平对加固柱滞回曲线有明显的影响,其它条件相同时,钢绞线配置量大或者预应力水平较高的试件滞回曲线较饱满;对于低轴压比(n≤0.30)试件,钢绞线配置特征值达到0.119、预应力水不小于0.40时即可获得较好的抗震性能。在试验基础上,提出了预应力钢绞线加固RC圆形短柱的受剪承载力计算公式,计算结果与试验值总体吻合良好。成果为预应力钢绞线加固RC短柱提供了参考数据和设计计算方法。
[Abstract]:In order to study the seismic behavior of reinforced concrete (RC) short columns strengthened by prestressed steel strands, seven specimens were subjected to low cycle repeated loading tests. The effects of axial compression ratio, steel strand configuration eigenvalue and prestress level on the seismic behavior of strengthened short columns are studied experimentally. The results show that prestressed steel strands can effectively improve the seismic performance of RC short columns, and the ductility and energy dissipation capacity of RC short columns are improved significantly. The displacement ductility coefficient of RC short columns strengthened by prestressed steel strands is higher than that of unstrengthened specimens PC1. The maximum value of cumulative energy dissipation capacity increases by 1.87 times and 6.78 times, respectively. The configuration of steel strands and the level of prestress have obvious effects on the hysteretic curves of strengthened columns, and other conditions are the same. The hysteretic curves of specimens with large configuration or high prestress level are full, and for specimens with low axial compression ratio (n 鈮，

本文编号：2026359