华南理工大学学报(自然科学版) ›› 2015, Vol. 43 ›› Issue (7): 42-49.doi: 10.3969/j.issn.1000-565X.2015.07.007

• 土木建筑工程 • 上一篇    下一篇

钢筋-纤维自密实混凝土梁受弯性能与承载力分析

宁喜亮 丁一宁   

  1. 大连理工大学 海岸和近海工程国家重点实验室,辽宁 大连 116024
  • 收稿日期:2014-10-13 修回日期:2015-03-17 出版日期:2015-07-25 发布日期:2015-06-03
  • 通信作者: 丁一宁( 1962-) ,男,教授,博士生导师,主要从事纤维高性能混凝土理论与工程应用研究. E-mail:ynding@hotmail.com
  • 作者简介:宁喜亮( 1984-) ,男,博士生,主要从事纤维高性能混凝土试验与理论研究. E-mail: ning-tony@163.com
  • 基金资助:
    国家自然科学基金面上项目( 51578019)

Analysis of Flexural Behavior and Bearing Capacity of Steel Rebar-Reinforced Steel Fiber-Reinforced Self-Compacting Concrete Beams

Ning Xi-liang Ding Yi-ning   

  1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2014-10-13 Revised:2015-03-17 Online:2015-07-25 Published:2015-06-03
  • Contact: 丁一宁( 1962-) ,男,教授,博士生导师,主要从事纤维高性能混凝土理论与工程应用研究. E-mail:ynding@hotmail.com
  • About author:宁喜亮( 1984-) ,男,博士生,主要从事纤维高性能混凝土试验与理论研究. E-mail: ning-tony@163.com
  • Supported by:
    Supported by the General Program of National Natural Science Foundation of China( 51578019)

摘要: 通过四点弯曲试验得到钢筋-纤维自密实混凝土梁式构件的荷载-跨中挠度曲 线、荷载-纵筋应变曲线和破坏形态,对梁式构件的受弯承载力及纤维与钢筋的混杂效应 进行了分析. 结果表明: 钢纤维的加入使钢筋-纤维自密实混凝土梁式构件的抗弯承载力提高了10% ~ 42%. 考虑钢纤维跨越裂缝的传力机理及分布情况提出了钢筋-纤维混凝土梁式构件受弯承载力计算公式,并与ACI 544 和CECS 38: 2004 的公式进行了对比,计算结果表明: 文中建议公式计算的受弯承载力与试验结果最为接近,可用于钢筋-纤维自 密实混凝土梁式构件的受弯分析与设计.

关键词: 钢筋, 钢纤维, 自密实混凝土, 钢筋-纤维自密实混凝土梁, 受弯承载力

Abstract: Bending tests under four point loading were conducted on steel rebar-reinforced steel fiber-reinforced self-compacting concrete ( SFRSCC) beams, and the corresponding loading-mid-span deflection curve, longitudinal reinforcement strain-longitudinal reinforcement strain curve and failure mode were obtained. The flexural bearing capacity of the beams and the hybrid effect of steel rebar and macro steel fibers were also examined. It is found that the addition of steel fibers can improve the flexural bearing capacity by 10%~ 42%. Moreover, by taking into account the steel fiber distribution and its force transfer mechanism crossing the crack, a calculation formula is proposed to predict the flexural bearing capacity of the beams, and it is compared with the formulas of ACI 544 and CECS 38: 2004. Calculation results show that the proposed formula has a better fit with the test results. Thus, it is suitable for the flexural analysis and design of SFRSCC beams.

Key words: steel rebar, steel fibers, self-compacting concrete, rebar-reinforced steel fiber-reinforced self-compacting concrete beam, flexural bearing capacity