带扇叶形锚固板钢筋机械锚固性能试验研究
RESEARCH ON ANCHORING BEHAVIOR OF REINFORCEMENT WITH FAN-SHAPED ANCHOR PLATE
吴琛 1姚鹏飞 1陈真锋 2邓芬1
作者信息
- 1. 福建理工大学福建省土木工程新技术与信息化重点实验室,福州 350118
- 2. 锦曦控股集团有限公司,福州 350017
- 折叠
摘要
为避免型钢混凝土节点钢筋锚固时导致的大量型钢穿孔或钢筋焊接,设计一种新型扇叶形锚固板,并通过带扇叶形锚固板钢筋中心拔出试验,分析锚固板形式、钢筋直径、锚固长度对带锚固板钢筋机械锚固性能的影响.试验结果表明:带扇叶型锚固板钢筋可避开抗剪栓钉,具有施工方便的优点,同时拥有良好的锚固性能;当钢筋锚固长度为 5d～7d时,发生混凝土劈裂破坏,当锚固长度为 8d～12d时,发生钢筋拉断破坏,且钢筋的锚固系数大于 1.25,具有良好的锚固性能;带扇叶形锚固板钢筋极限粘结强度随钢筋直径、钢筋锚固长度增大而减小,建议钢筋的锚固长度取为 8d;提出了适用于带扇叶形锚固板钢筋极限粘结强度的计算公式,能较准确地反映扇叶形锚固板对混凝土产生的挤压和劈裂作用.
Abstract
To avoid perforations and welds caused by reinforcement anchorage at steel reinforced concrete joints,a new type of fan-shaped anchor plate was proposed.The influence of anchor plate form,of bar diameter and of embedment length on mechanical anchorage performance were analyzed by the center pull-out test of the reinforcement with fan-shaped anchor plate.The test results show that:the reinforcement with fan-shaped anchor plate can avoid the shear stud,which is convenient for construction and has positive anchoring behavior.The failure mode is concrete splitting failure when the embedment length of reinforcement is 5d-7d.Whereas when the embedment length is 8d-12d,the failure mode is tensile failure of reinforcement and,the anchorage coefficient of reinforcement is greater than 1.25,indicating a good anchoring behavior.The ultimate bond strength decreases as the diameter and the embedment length increase,the embedment length is suggested to be 8d.This work proposes an ultimate bond strength formula for the reinforcement with fan-shaped anchor plate that accurately reflects the squeezing and splitting effect of the fan-shaped anchor plate on the concrete.
关键词
扇叶型锚固板/中心拔出试验/机械锚固性能/极限粘结强度/型钢混凝土节点Key words
fan-shaped anchor plate/center pull-out test/mechanical anchoring behavior/ultimate bond strength/steel reinforced concrete joints引用本文复制引用
出版年
2025
NETL
NSTL
万方数据