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预应力CFRP板加固混凝土梁技术对其锚固件研究较多,而对其加固效果和破坏荷载下的力学模式缺乏数据分析。通过对空心板原型梁按比例缩小后制作3根混凝土实心模型梁,在预压和预应力CFRP板加固后考察不同荷载下梁的力学性能、破坏形态及裂缝发展。结果表明,该加固方法能有效地限制裂缝发展,提高混凝土梁承载力;加固件在较小荷载下符合平截面假定,预应力CFRP板和混凝土梁协同工作,随荷载增加,应变先减小后增大;施加的预应力使梁体应力重新分布,钢筋应力和构件变形都减小;理论计算与模型试验比较表明加固后梁体存在较大的安全储备。
Prestressed CFRP plate reinforced concrete beam technology for its anchors more research, but its reinforcement effect and failure under the load of the mechanical model of the lack of data analysis. Three concrete solid model beams were made by reducing the prototype beam of the hollow slab. The mechanical properties, failure modes and crack development of the beam under different loads were investigated after the prestressed and prestressed CFRP sheets were strengthened. The results show that the reinforcement method can effectively limit the development of cracks and increase the bearing capacity of the concrete beam. The reinforcement complies with the assumption of flat section under small load. The prestressed CFRP plate and the concrete beam work together. With the increase of load, the strain first decreases Increase; the prestress applied to the beam stress redistribution, stress and deformation of the reinforcement are reduced; theoretical calculations and model tests show that there is a greater safety margin beam reinforcement.