内嵌预应力筋材加固混凝土梁的延性性能研究

摘要

Spiral rib steel wire has good performance and high strength low relaxation,the anchorage performance and ductility is better than the prestressing CFRP plate.To calculate the relationship between the prestressed spiral rib steel reinforced quantity,initial prestress structure parameter and yield curvature,the ultimate curvature,derived embedded with prestressed helical rib steel wires reinforced mix-ing coagulation beam ductility coefficient calculation formula.In order to ensure the reinforcement to improve the bearing capacity of member at the same time,to meet the requirements of ductility.On the basis of test,The ductility coefficient calculation results are com-pared with the experimental results.The theoretical results are in good agreement with the experimental results.The ductility coefficient deduced the calculation formulas are correct,and can be used in practical engineering.%螺旋肋钢丝具有良好的低松驰性能和高强度，其锚固性能和延展性能比预应力碳纤维板更好。对预应力螺旋肋钢丝加固量、初始预应力等参数与结构屈服曲率、极限曲率之间的关系进行计算，推导出内嵌预应力螺旋肋钢丝加固混凝梁的延性系数计算式，以确保加固构件承载力提高的同时满足延性要求。在此基础上根据推导结果进行试验，将延性系数计算结果与试验研究结果进行对比，理论计算结果与试验结果吻合良好，表明推导出的延性系数计算式正确，可以在实际工程中使用。