喷射高性能水泥复合混凝土加固石拱桥试验研究

Experimental Investigation on Stone-arch Bridge Strengthened with Injecting High Performance Cement Composite Concrete

通过1座未加固石拱桥模型与1座带载喷射高性能水泥复合混凝土加固石拱桥模型的破坏实验,研究了喷射高性能水泥复合混凝土加固石拱桥的加固效果及加固计算方法.试验结果表明,在石拱桥模型达到破坏荷载70%时持载喷射60mm厚高性能水泥复合混凝土加固,石拱桥模型承载力提高幅度为25%.喷射高性能水泥复合混凝土加固石拱桥能有效提高其承载力,改善其脆性破坏的性质,是一种经济有效的石拱桥加固方法.文中所用的加固后石拱桥承载力计算方法的计算结果与实验结果吻合良好,可供工程加固设计参考使用.

In order to investigate the reinforcement effect and calculation method of stone arch bridge strength-ened with inj ecting high performance cement composite concrete,an unreinforced stone arch bridge model and an load-carrying stone arch bridge model strengthened by inj ecting high-performance cement composite concrete were made for the destruction test.The experiment results show that the ultimate compressive bearing capacity of stone arch bridge model strengthened by injecting 60mm high-performance cement composite concrete can be improved by 25%,when the sustained load reaches 70% of the failure load.Strengthening stone arch bridge by inj ecting high performance ce-ment composite concrete can effectively improve the failure load and properties of brittle failure,which is an economi-cal and effective arch bridge strengthening method.The calculation results of strengthening arch bridge bearing capaci-ty were in good agreement with experimental results,and the calculation method can be employed to design in strengthening engineering.