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为研究火灾中植筋连接构件的抗火性能,进行了35个化学植筋试件在不同温度下(25～200°C)的拉拔试验以及12个植筋连接混凝土构件的受火试验。拉拔试验重点研究了植筋胶的粘结力随温度变化的规律,以及不同温度下植筋胶的粘结—滑移关系,结果表明:随着温度升高,植筋胶的粘结力显著下降。植筋构件的受火试验中,考虑了植筋深度(15d,20d,d为钢筋直径)和保护层厚度(25、40、60mm)两种影响因素。首先对6个试件按ISO834标准升温曲线升温(荷载为常温下植筋构件设计承载力的10%),到指定时间后,加载至构件破坏失效,结果表明:植筋深度和保护层厚度对火灾中植筋连接构件的极限承载力均有重要影响。其后进行了6个构件的恒载升温试验(荷载为常温下常规植筋构件设计承载力的80%),直至构件破坏,结果表明:当保护层厚度小于40mm时,植筋深度和保护层厚度对耐火极限均有重要影响;当保护层厚度大于40mm时,对耐火极限的影响植筋深度要大于保护层厚度。
In order to study the fire resistance of the anchorage-connected components in fire, the pull-out test of 35 chemical-planting specimens at different temperatures (25 ~ 200 ° C) and the fire test of 12 anchorage-connected concrete members were carried out. The pullout test focuses on the relationship between the adhesive force of anchorage adhesive with temperature and the bond-slip relationship of anchorage adhesive under different temperatures. The results show that with the increase of temperature, the anchorage force of anchorage glue Decreased significantly. In the fire test of anchorage-reinforced components, two influencing factors, anchorage depth (15d, 20d, d for reinforcement diameter) and protective layer thickness (25, 40, 60mm) were considered. Firstly, six specimens were heated according to the ISO834 standard temperature rise curve (load is 10% of the designed bearing capacity of the anchorage member at room temperature). After the specified time, the specimens were loaded to the failure of the components. The results showed that the depth of the planting bar and the thickness of the protective layer The ultimate bearing capacity of anchorage connecting members in fire has a significant impact. After that, six components were tested under constant load (the load was 80% of the designed bearing capacity of conventional reinforcement at normal temperature) until the components were destroyed. The results showed that when the thickness of the protective layer was less than 40mm, The thickness of the fire resistance has an important impact; when the protective layer thickness is greater than 40mm, the impact on the fire resistance of planting depth is greater than the protective layer thickness.