体外预应力加固RC超静定梁抗弯性能试验研究

Experimental Study on Flexural Behavior of Hyperstatic RC Beams Reinforced by External Prestressing

为了研究体外预应力加固钢筋混凝土超静定梁的受弯性能,对三根混凝土梁进行了试验研究,其中一根为未加固的对比试验梁.研究结果表明:采用体外预应力加固混凝土超静定梁能显著改善试验梁的受弯性能,提高试验梁的承载力,增大结构刚度并能推迟裂缝的出现,加固前对构件进行卸载的试验梁比不卸载的梁具有更好的加固效果,进行卸荷的试验梁比未卸荷的梁具有更好的刚度并能更好地推迟裂缝的出现以及减小裂缝的宽度.

In order to research the flexural behavior of hyperstatic reinforced concrete beam strengthened by external prestressing,we researched three reinforced concrete beams which inchlud one unreinforced beam used for comparision.The result shows that external prestressing can observably improve fixed RC beams＇ flexural behavior and supporting ca-pacity,meanwhile enlarge structural stiffness to put off appearing crack.The experiment with beam unloaded before can get better reinforcement effect than the loaded beam,and the unloaded beam have a better structural stiffness to put off ap-pearing crack and reduce the width of crack expansion.