摘要
设计了直径20 mm、埋深20 cm、混凝土基材强度等级C25的植筋试件30个,并对在常温下、高温自然冷却后、高温下恒温加载和高温下恒载升温4种工况进行了拉拔试验.通过总结其破坏形态,测算其极限承载力、极限粘结应力和承载力损失,得出了高温自然冷却后和高温下恒温加载试件极限粘结应力和承载力损失规律,高温下恒载升温试件在不同预加载力下试件破坏的滑移变化规律;结合工程实际对高温条件下植筋结构的安全性进行了判定,给出了植筋结构抗火设计和维修加固依据,可为推广应用植筋技术提供参考.
It is designed 30 specimens with 20 mm diameter bonded rebar, 20 cm embedment depths, C25 strength grade of concrete substrate. Experiment study is conducted on the pullout strength of normal temperature, high-temperature after natural cooling, constant temperature with pullout loading under high temperature, the constant loading with gradual heating under high temperature four conditions. This paper measured and calculated its ultimate pullout strength, ultimate bond stress and loss of bearing capacity, it summarized its failure mode, analyzed the general law of ultimate bond stress and the loss of bearing capacity with constant temperature, pullout loading under high temperature and constant loading with gradual heating under high temperature specimens, as well as the general law of bond-slip behavior on constant loading with gradual heating and different pre-load power under high temperature, determined bonded rebar specimens of the safety under high temperature. The test results can provide reference about the use of bonded rebar technology.
出处
《湖南城市学院学报（自然科学版）》
CAS
2009年第4期1-4,共4页
Journal of Hunan City University:Natural Science
基金
铁道部科技研究开发计划资助项目(2006G007-A-1)
关键词
高温
植筋
极限承载力
试验研究
high temperature
bonded rebar
ultimate pullout strength
experimental study
