纤维增强钢筋混凝土T形柱框架边节点抗震性能试验研究

发布时间：2018-01-01 20:39

本文关键词：纤维增强钢筋混凝土T形柱框架边节点抗震性能试验研究　出处：《建筑结构学报》2014年S1期 　论文类型：期刊论文

【摘要】：T形柱框架边节点的核心区截面薄弱,是异形柱结构的抗震薄弱部位。为改善节点抗震性能,提出一种T形柱框架边节点区及相邻梁端一定范围内采用聚丙烯纤维混凝土替代普通混凝土的增强方法。通过梁端反复荷载作用下4个纤维增强范围不同的T形柱框架边节点试件的试验结果,对比试件滞回特性、承载能力和变形能力、延性和耗能能力、刚度退化、残余变形等抗震性能指标,确定最佳的纤维增强范围,提出纤维增强T形柱框架边节点受剪承载力的设计计算方法。对比分析结果表明,纤维增强T形柱框架边节点破坏程度减轻,承载能力和变形能力、耗能能力增强,刚度退化和残余变形减小,纤维最佳掺入范围是节点核心区至邻近1倍梁高范围。考虑纤维增强作用,提出T形柱框架边节点受剪承载力的计算模型并与节点受剪承载力试验值进行对比验证,结果表明模型计算式形式简单,用于结构设计具有足够的安全性。
[Abstract]:T shaped column frame side core section of nodes is weak, seismic the weak parts of the structure. In order to improve the seismic performance of the node, a T shaped column frame joints and adjacent beam enhancement method within a certain range by polypropylene fiber concrete instead of ordinary concrete was put forward. Through the end of the beam under repeated loading 4 the test results of fiber reinforced T shaped column frame with different boundary nodes, compared the hysteretic characteristics, bearing capacity and deformation capacity, ductility and energy dissipation capacity, stiffness degradation, residual deformation and seismic performance index, determine the optimal range of fiber reinforced fiber reinforced T, proposed frame shaped column joints by calculation the design method of shear bearing capacity. The results show that the fiber reinforced T frame shaped column joints to reduce the degree of damage, the bearing capacity and deformation capacity, energy capacity, stiffness degradation and residual deformation decreases, The best fiber incorporation range is the node in the core area adjacent to 1 times of the beam height. Considering the effect of fiber reinforcement, proposes a framework of T shaped column joints shear bearing capacity calculation model and joint shear strength were compared, the results show that the model formula is simple in form and use in structural design with safety enough.

【作者单位】：天津大学建筑工程学院;天津大学滨海土木工程结构与安全教育部重点实验室;
【基金】：国家自然科学基金项目(51178304) 高等学校博士学科点专项科研基金项目(20120032120055)
【分类号】：TU375
【正文快照】： 0引言研究[1-2]表明,异形柱节点区受剪承载力比矩形柱节点的低8%~10%,是异形柱结构的薄弱部位,易发生脆性破坏。抗震设防烈度7度(0.15 g)和8度(0.2 g)的地区,房屋高度和层数常受节点受剪承载力制约,节点受剪承载力不足成为限制异形柱结构高度和抗震区应用范围的重要瓶颈。为提

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