Experimental study on retrofitted RC railway viaduct columns subjected to earthquake loads

초록

Earthquake damage on the viaduct bridge of the railway may give rise to social loss due to transport restrictions greater than the cost of structural recovery. Therefore, it is necessary that reinforced concrete structures of the railway viaduct, especially life-safety structures not designed in accordance to modern earthquake code be reinforced to endure earthquake loads. To properly strengthen these vulnerable reinforced concrete structures against complex seismic loading patterns, it is important to understand the progression of damage and the mechanisms causing collapse in reinforced concrete columns from the experimental results. This paper focuses on the properties of RC columns confined by HTA(HyperTex & perforate Aluminium) under cyclic lateral loads and axial compression. An experimental program that involved 1/3 scaled 5 specimen was conducted. Different HTA thickness was considered as main parameter in this experiment. Test results that have been obtained for retrofitted RC columns suggest certain relationships between structural parameters including the stiffness, ductility and energy dissipation capacity