钢板加固高温后钢筋混凝土梁抗弯性能研究

摘 要：为研究钢板加固高温后混凝土梁抗弯性能的变化规律，对1根常温未加固梁、1根常温加固梁、2根高温后未加固梁和2根高温后加固梁进行对比试验研究，得到了梁截面温度场分布规律及试件受弯性能的变化规律。研究结果表明，梁截面温度场呈外高内低的不均匀分布。加热60,90 min后试验梁的抗弯承载力较常温梁分别折减7.1%、10.9%；加热60,90 min的试验梁经钢板加固后其抗弯承载力相较于常温未加固梁分别提高13.3%、10.5%。借鉴常温加固梁承载力计算公式，结合温度场模拟结果，提出了高温后钢板加固梁抗弯承载力理论计算方法，计算结果误差较小，符合实际工程精度要求。

Research on flexural performance of reinforced concrete beams strengthened by steel plate after high temperature

Abstract: In order to study the change law of the flexural performance of concrete beams strengthened by steel bonding after high temperature, a comparative test study was carried out on one unreinforced beam at room temperature, one reinforced beam at room temperature, two unreinforced beams after high temperature and two beams strengthened after high temperature. The distribution law of the cross-section temperature field and the variation law of the bending performance of the specimen were obtained. The research results show that the temperature field of the beam section is unevenly distributed with high outside and low inside. After heating for 60 min and 90 min, the flexural bearing capacity of the test beam is reduced by 7.1% and 10.9%, respectively, compared with that of the normal temperature beam. The reinforced beams were increased by 13.3% and 10.5% respectively. With reference to the calculation formula for the bearing capacity of beams strengthened at room temperature, combined with the simulation results of the temperature field, a theoretical calculation method for the flexural bearing capacity of the bonded steel beams after high temperature is proposed. The calculation results have small errors and meet the actual engineering accuracy requirements.