混凝土梁柱节点带锚固板钢筋锚固性能试验研究
Experimental research on anchorage performance of headed reinforcement in concrete beam-column joints
易伟建 1古攀2
作者信息
- 1. 湖南大学 工程结构损伤诊断湖南省重点实验室,湖南长沙 410082;湖南大学 土木工程学院,湖南长沙 410082
- 2. 湖南大学 土木工程学院,湖南长沙 410082
- 折叠
摘要
为研究混凝土梁柱节点带锚固板钢筋锚固性能,共设计33个满足现行规范构造要求的拟梁柱节点试件,通过静载试验分析混凝土强度、锚固长度、锚固板尺寸、箍筋间距等参数对带锚固板钢筋锚固承载力的影响;通过拟合试验数据得到带锚固板钢筋锚固力经验公式,提出带锚固板钢筋锚固长度设计建议,并基于试验数据库对建议公式以及中国规范公式进行了统计分析.结果表明:混凝土强度、钢筋锚固长度和锚固板面积对带锚固板钢筋锚固承载力有较大的影响,而承载力对箍筋间距不是很敏感;锚固板分担的锚固力占总锚固力的70％以上,中国规范对锚固板分担占比的规定偏小,对锚固长度的规定偏于不安全;建议现浇框架中间层梁柱角节点带锚固板钢筋的锚固长度调整为0.45lab(lab为中国规范的基本锚固长度),中间层梁柱边节点的锚固长度可不作调整.
Abstract
In order to research the anchorage performance of headed reinforcement in concrete beam-column joints,a total of 33 quasi-beam-column joints were designed,which met the structural requirements of current codes.The influence of concrete strength,anchorage length,anchorage plate size,stirrup spacing,and other parameters on the bearing capacity of headed reinforcement was analyzed by the test data.An empirical formula of anchorage force of headed reinforcement was obtained by fitting the experimental data,and the design proposal of anchorage length of the headed reinforcement was put forward.Based on the test database,the proposed formula and the Chinese code formula were statistically analyzed.The results show that the concrete strength,anchorage length,and anchorage plate size have a marked impact on the bearing capacity of headed reinforcement.The bearing capacity is not very sensitive to stirrup spacing,and the anchorage force shared by the anchorage plate accounts for more than 70％of the total anchorage force.The regulation in China code on the proportion of anchorage plate sharing is relatively small.The code regulation on anchorage length may be unsafe.It is suggested that the anchorage length of headed reinforcement in the corner joint of the middle-story beam-column of a cast-in-place frame should be adjusted to 0.45lab(lab is the basic anchoring length in China code),and the anchorage length in the side joint of the middle-story beam-column should not be adjusted.
关键词
带锚固板钢筋/锚固长度/承载力/混凝土强度/梁柱节点Key words
headed reinforcement/anchorage length/bearing capacity/concrete strength/beam-column joint引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据