CFRP及TRM加固受火后预应力空心板受力性能试验研究

Experimental Study on the Performance of Prestressed Hollow Slab Strengthened with CFRP and TRM After Fire

将受IS0-834标准火灾1 h后的预制混凝土空心楼板分别采用粘贴1层和2层CFRP和喷涂2层TRM不同方法进行加固,通过对加固后的空心楼板进行静力加载试验,考察不同方法加固后板的开裂荷载、破坏荷载、破坏形态、裂缝开展和变形发展,以及通过比较各试件截面内不同材料应力变化情况,研究这两种方法对受火灾后的预制混凝土空心楼板的加固效果。结果表明,采用CFRP和TRM加固对受火后空心楼板的极限承载力和刚度均有较大幅度提升。相比之下,CFRP加固方法对承载力提高更为明显,而TRM加固方法对提高构件刚度和变形能力更明显。

Prestressed hollow slabs after the fire of ISO - 834 for one hour were strengthened with 1 or 2 layersof CFRP and with 2 layers of TRM. Static loading experiments were conducted to investigate the crackingload, failure load, failure modes, cracking and deformation development. Through comparing the stress ofdifferent materials, the reinforcement effects were studied. Results showed that, both two methods can highlyimprove the ultimate bearing capacity and stiffness of the prestressed hollow slabs. Under the experimentalcondition, CFRP does better in improving the ultimate bearing capacity and TRM is more effective to improvethe stiffness and deformation capacity of the prestressed hollow slabs.