内嵌预应力混杂筋材加固混凝土梁试验研究

Experimental study on concrete beams strengthened with prestressed near-surface-mounted helical rib steel wire and CFRP rod

基于螺旋肋钢丝、CFRP筋材两种材料的特点,提出将预应力螺旋肋钢丝、CFRP筋材混合内嵌于混凝土梁中的加固方法,并通过对1根对比梁、6根内嵌不同加固筋材的试验梁进行静力加载试验,系统分析了加固梁的抗弯承载能力、变形能力、裂缝状况、破坏形态和延性等。研究结果表明,加固方法在满足延性要求的同时,能够显著提高试验梁的开裂荷载、屈服荷载、极限荷载,改善被加固梁的变形能力。其中,BF1P2-45加固梁的加固效果较好。研究成果可为其他相关研究提供参考。

Based on the properties of helical rib steel wire and carbon fiber reinforced polymer ( CFRP ) rod,a new reinforcement method of concrete beams with prestressed near-surface-mounted ( NSM) helical rib steel wire and CFRP rod was presented. Static loading tests were carried out on one contrast beam and six test beams strengthened with different reinforcement bars. The flexural bearing capacity,deformation capacity,crack condition,failure state and ductility of the strengthened beams were analyzed systematically. The experimental results show that the reinforcement method can significantly increase the cracking load,yield load and ultimate load of the test beams while meeting the requirement of ductility,and the deformability was also improved. The research results can provide a reference for other related research.