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高性能复合砂浆钢筋网薄层(简称HPFL)加固混凝土构件是一种新型的加固方法,为研究其高温性能,对7根三面U型(在梁的受拉面和侧面进行加固)加固梁和1根未加固对比梁从加固界面原混凝土表面粗糙度、初始荷载两个方面进行了高温抗剪试验研究。试验结果表明,在初始荷载一定的条件下,加固界面为Ⅰ级粗糙度的试件耐火时间较短,出现了加固层剥离退出工作的现象,Ⅱ级粗糙度、Ⅲ级粗糙度试件的耐火时间显著延长,且均为整体破坏,说明当加固界面为Ⅱ级、Ⅲ级粗糙度时能显著提高试件的耐高温性能。在界面粗糙度等级相同的条件下,随着初始荷载的增加,加固梁的耐火性能迅速下降。
High-performance composite mortar reinforced concrete thin-layer (HPFL) reinforced concrete member is a new type of reinforcement method. In order to study its high temperature performance, seven reinforced concrete beams reinforced with seven U-shaped three sides (reinforcement on the tensile and side of the beam) Compared with the unbonded root beam, the high temperature shear test was conducted on the two aspects of the surface roughness and the initial load of the reinforced concrete interface. The test results show that under the condition of initial load, the specimens with reinforcement interface Ⅰ grade have a shorter refractory time, and the reinforcement layer peels off to exit the work. The grade II roughness, grade Ⅲ roughness of refractory The time was significantly prolonged, and all the damage, indicating that when the reinforcement interface is Ⅱ, Ⅲ grade roughness can significantly improve the high temperature performance of the specimen. Under the condition of the same interface roughness, the fire resistance of the reinforced beam decreases rapidly with the increase of initial load.