湖南大学学报（自然科学版）2024，Vol.51Issue(3)：1-7,7.DOI:10.16339/j.cnki.hdxbzkb.2024022
钢绞线热铸锚节点高温下抗拉性能试验研究
Experimental Study on Tensile Behavior of Hot-cast Anchor Socket of Steel Twisted Wire Strands at Elevated Temperatures
摘要
Abstract
Aiming at the problem that hot-casting sockets are easy to fail at elevated temperatures due to the low melt point of Zn-Cu alloy(approximately 460℃±10℃),high-temperature tensile tests were carried out on the hot-cast anchor sockets of prestressing twisted wire strands to obtain the failure modes and tensile capacity of specimens at elevated temperatures.The ultimate tensile capacity calculation formulas of the hot-cast anchor sockets of twisted wire strands and critical temperature under various load ratios were proposed,which can be used for the fire resistance capacity verification and fire protection layer thickness design of the hot-cast anchor sockets.Test results show that the failure mode is the rupture of the strand when the temperature is lower than 200℃,while the failure mode is the pull-out of the strand from the socket when the temperature is greater than 200℃.When the temperature is in 150～440℃range,the load capacity of the anchorage decreases as the temperature increases.The load capacity at the anchorage temperature of 287℃,340℃,392℃and 425℃is 77.3%,39%,35.2%and 10.5%of that at ambient temperature,respectively.关键词
预应力/索/热铸锚节点/高温试验/火灾/抗拉性能Key words
prestressing/cables/hot casting anchorages/high temperature testing/fires/tensile behavior分类
建筑与水利引用本文复制引用
楼国彪,侯婧,戚洪辉,宋战辉..钢绞线热铸锚节点高温下抗拉性能试验研究[J].湖南大学学报（自然科学版）,2024,51(3):1-7,7.基金项目
国家自然科学基金资助项目(51578420),National Natural Science Foundation of China(51578420) （51578420）
