高温损伤后粘钢板加固混凝土梁的抗弯性能

Study on Bending Behavior of RC Beam after High Temperature Reinforced by Bonding Steel Plate

对粘钢板加固高温(250℃,350℃,450℃,550℃)损伤后钢筋混凝土梁的抗弯性能进行了试验研究,得到了受热温度对加固梁抗弯性能的影响规律。结果表明,高温后粘钢板加固效果明显,梁的开裂荷载、屈服荷载和极限荷载都有不同程度的提高,且粘钢板加固对减小高温损伤后梁的挠度也有明显作用。当采用必要的锚固措施后,粘钢加固法对于450℃以下高温梁的加固具有良好的适用性和可靠性,当温度达到550℃时,粘钢板法仍具有一定的适用性。

The flexural performance of RC beams after high temperature strengthened by bonding steel plate was investigated. The results show that the effect of strengthening is obvious, and the cracking load, yield load and ultimate load of the strengthened beams were increased in various degrees. Meanwhile, the bonded steel plate can obviously diminish the deflection of beams. This indicated that, when using necessary anchorage measures, the application of bonding steel plates in reinforcement of RC beam after high temperature below 450℃ possesses excellent applicability and reliability. When the temperature researched 550℃, bonding steel plate method also possess certain applicability.