体外预应力加固钢筋混凝土连续梁受力性能与计算分析

Mechanical Behavior of Reinforced Concrete Continuous Beams Strengthened by External Prestressing Tendon

通过4根钢筋混凝土连续梁体外预应力加固试验,对预应力加固连续梁的裂缝、挠度、承载力等受力性能进行研究,提出预应力加固连续梁极限承载力的影响因素,并对预应力加固连续梁的计算进行了分析。试验证明:预应力加固钢筋混凝土连续梁能使其刚度和抗裂性能有较大的提高,并能有效地提高加固梁的受弯承载力;加固梁混凝土强度等级、预应力筋的线形、施加预应力大小和二次效应的作用对预应力加固连续梁极限抗弯承载力都有较大的影响,预应力加固设计时必须综合考虑。

The experiment on four reinforced concrete continuous beams strengthened by external prestressing tendon is carried out.The mechanical behavior of the externally prestressed concrete continuous beam is studied,and the influencing factors of the ultimate bearing capacity of the externally prestressed continuous beam are presented.The deflection and bearing capacity of the strengthened continuous beam are analyzed.Results show that the ultimate bearing capacity,the crack resistance and stiffness of the reinforced concrete continuous beam are greatly strengthened.The ultimate bearing capacity of the strengthened continuous beam will be influenced by the concrete grade,the alignment of prestressing tendon,the value of prestressing force and the quadratic effect.So comprehensive consideration should be paid to the strengthening design of the reinforced concrete continuous beam.