630MPa热处理带肋高强钢筋机械锚固性能试验研究
Experimental study on mechanical anchoring performance of 630MPa heat treated ribbed high-strength steel bar
戎贤 1孙小康 1赵川 2李艳艳 1徐超 3王凤亮 3谭冰3
作者信息
- 1. 河北工业大学土木与交通学院,天津 300401
- 2. 中国二十二冶集团有限公司,唐山 063000
- 3. 中建八局第二建设有限公司,济南 250022
- 折叠
摘要
为了研究630MPa热处理带肋高强钢筋的机械锚固性能分别采用单侧贴焊锚固与端头塞焊锚板的形式,对2组60个试件进行拉拔试验.研究不同锚固条件下混凝土抗拉强度、锚固长度、钢筋直径、混凝土保护层厚度及配箍率对其机械锚固性能的影响.结果表明:630MPa热处理带肋高强钢筋机械锚固试件具有3种破坏形式,即混凝土劈裂、钢筋拔出、钢筋屈服,端头塞焊锚板试件抗滑移效果更优.试件的机械锚固强度随着混凝土抗拉强度、混凝土保护层厚度、配箍率的增大而增大,随着锚固长度、钢筋直径的增加而减小.基于试验结果建立了 630MPa热处理带肋高强钢筋机械锚固强度计算公式,结果表明该公式计算值与试验值吻合较好.
Abstract
In order to study the mechanical anchoring performance of 630MPa heat treated ribbed high-strength steel bar,two groups of 60 specimens were subjected to pull-out tests,which were in the form of single side bonding anchorage and the end plug bonding anchor plate.The influence of concrete tensile strength,anchorage length,reinforcement diameter,thickness of concrete cover and stirrup ratio on mechanical anchoring performance under different anchoring conditions was studied.The results show that the mechanical anchoring specimens with 630MPa heat treated ribbed high-strength steel bar have three failure modes,namely concrete splitting,steel pulling out and steel yielding.The specimens of end plug bonding anchor plate has better anti-slip effect.The mechanical anchoring strength of specimens increases with the increase of concrete tensile strength,thickness of concrete cover and stirrup ratio.It decreases with the increase of anchoring length and reinforcement diameter.Based on the experimental results,a formula for calculating mechanical anchoring strength of 630MPa heat treated ribbed high-strength steel bar was established.The results show that the calculated values of the formula are in good agreement with the experimental values.
关键词
热处理带肋高强钢筋/机械锚固性能/荷载-滑移曲线/机械锚固强度Key words
heat treated ribbed high-strength steel bar/mechanical anchoring performance/load-slip curve/mechanical anchoring strength引用本文复制引用
基金项目
河北省自然科学基金(E2019202064)
河北省重点研发计划(22374501D)
出版年
2024
NETL
NSTL
万方数据