二期荷载下预应力CFP加固钢筋混凝土梁

Two loads of reinforced concrete beams prestressed CFP

对预应力碳纤维片加固钢筋混凝土梁进行了可行性研究。根据碳纤维板的特性,为了施加预应力,开发了一种预应力钳及一个装置。在普通碳素纤维板和预应力碳纤维板之间,及二次荷载的碳纤维片和混凝土梁二次荷载的碳纤维板之间进行了对比实验。在此基础上,我们分析了故障模式、裂缝的宽度和分布、开裂荷载、屈服载荷、极限载荷及载荷与挠度之间的关系。结果表明,采用预应力碳纤维片来加强混凝土梁有效可行。

Feasibility of using pre- stressed carbon fiber plates to strengthen reinforced concrete beams was studied. Based on the characteristics of carbon fiber plates,we developed a pre- stress clamp and a device for applying the pre- stress. Contrast tests were conducted between ordinary carbon fiber plates and a pre- stressed carbon fiber plate and between secondary loaded carbon fiber plates and a concrete beam strengthened with a secondary loaded carbon fiber plate. On this basis,we analyzed the failure pattern,the width of cracks and their distribution,the cracking load,the yield load,the limit load and the relation between load and deflection. The results indicate that using pre- stressed carbon fiber plates to strengthen concrete beams is feasible and effective.