预应力碳纤维布加固效果试验研究

The Experimental Study of Prestressed Carbon Fiber Cloth Strengthening Effect

通过预应力碳纤维布加固试验梁试验,模拟预应力混凝土旧桥加固方法,试验过程采用分级加载方式,对试验梁加固前后各级荷载作用下控制截面的应变、位移和裂缝宽度进行详细加载测试。试验结果表明,预应力碳纤维布加固方法兼具体外预应力和普通碳纤维布两种主、被动加固方法的优点,能够有效降低开裂结构控制截面的应变、挠度和裂缝宽度,提高结构刚度和耐久性,延长桥梁使用寿命。

Through the prestressed carbon fiber cloth strengthening test beam experiment,the strengthening methods of prestressed concrete old bridge are simulated. During the experiment,the hierarchical loading method is used,which carried out a detailed load test of strain,displacement and crack width of the control section under various loads before and after the test beam reinforcement. The test results show that the prestressed carbon fiber cloth strengthening methods have both the advantages of active and passive reinforcement methods of external prestressed and common carbon fiber cloth. The method can effectively reduce the strain,deflection and crack width of the cracking structure control section,and improve the structural rigidity and durability,prolong the service life of the bridge.