钢筋混凝土梁受拉区钢纤维影响系数的概率分布与取值建议
Probability Distribution and Recommended Value of Steel Fiber Impact Coefficient in the Tensile Zone of Reinforced Concrete Beams
黄云超 1高丹盈 2朱海堂 3房栋 4丁冲4
作者信息
- 1. 华北水利水电大学水利学院,河南郑州 450046
- 2. 郑州大学水利科学与工程学院,河南郑州 450002;河南工程学院土木工程学院,河南郑州 451191
- 3. 河南工程学院土木工程学院,河南郑州 451191
- 4. 郑州大学土木工程学院,河南郑州 450002
- 折叠
摘要
通过18根高强钢筋钢纤维混凝土梁和1根高强钢筋混凝土梁的受弯试验,研究了混凝土强度、钢筋强度、钢纤维体积率、钢纤维端部弯钩数量、钢纤维混凝土层厚比和纵筋配筋率对钢筋混凝土梁受弯承载力的影响,讨论了我国现行规范中反映钢纤维对梁受弯承载力影响的系数值用于计算高强钢筋钢纤维混凝土梁受弯承载力的适用性.结果表明,掺入钢纤维可有效提高高强钢筋混凝土梁的受弯承载力;与我国现行规范中钢纤维影响系数值相比,高强钢筋钢纤维混凝土梁受拉区钢纤维影响系数值偏小;在此基础上,通过收集国内外文献中相关的试验数据,重点分析了钢纤维影响系数的概率分布,得到不同保证率下的钢纤维影响系数值,提出了钢筋钢纤维混凝土梁受拉区钢纤维影响系数值的取值建议,可为我国规范的修订提供参考.
Abstract
The 18 steel fiber reinforced concrete(SFRC)beams and one reinforced concrete(RC)beam with high strength steel bars were investigated by means of flexural experiments.The test variables were concrete strength,steel bar strength,steel fiber volume fraction,steel fiber end hooks number,depth ratio of SFRC in tensile zone and longitudinal tensile reinforcement ratio.The applicability of the steel fiber impact coefficient in current code of China for the calculation of flexural capacity of SFRC beam with high strength steel bars was also discussed,of which the impact coefficient value was used to reflect the influence of steel fiber on the flexural capacity of SFRC beams.Test results indicated that the flexural capacity of RC beam with high strength steel bars improved effectively with the addition of steel fibers.The value of steel fiber impact coefficient in the tensile zone of SFRC beams with high strength steel bars is relatively small while compared with that in current code of China.The probability distribution of steel fiber impact coefficient was emphatically analyzed through the experimental data collecting from relevant literatures,and the steel fiber impact coefficients for the different types of steel fibers with various guarantee rates were achieved.Finally,the suggestion for the value of steel fiber impact coefficient in the tensile zone of SFRC beams was proposed,which could be referred for the code revision.
关键词
高强钢筋/钢纤维混凝土/梁受弯承载力/影响系数/概率分布/保证率Key words
high strength steel bar/steel fiber reinforced concrete/flexural capacity/impact coefficient/probability distribution/guarantee rate引用本文复制引用
出版年
2024
NETL
NSTL
万方数据