Experimental Study And Finite Element Analysis Of Localized Corrosion On The Ultimate Bearing Capacity Of Steel Arch

Arch bridge has a long history in China. It is one of the most popular types of bridges in China for a long time caused its characteristics of various structural forms, beautiful shape and big stiffness. In spite of more and more bridge types in the last three decades, a lot of arch bridges have been built with remarkable achievements in design, construction, etc. However,many damage had happened to steel arch bridges during their service period. The corrosion of steel poses a serious threat to the durability of bridges. So the research of remaining capacity of steel arch bridges after being corroded should be taken seriously enough. Based on the corrosion disease of steel arch bridges, this paper is carried out the following work:(1)In order to investigate the corrosion influence on ultimate bearing capacity of steel tube arch rib, 4 round steel tube arch rib models are designed. The way of changing the steel tube local ring thickness is adopted to simulate local corrosion of different parts, in the form of symmetric in-plane five point loading, the bearing capacity is test. Observe the whole process of load change and analyze the result of the test. The results show that compare to the corrosion situation of vault, the corrosion situation of joint between derrick and arch rib decrease the bearing capacity in larger amplitude of 8% under the same load. There is a big error between the actual wall thickness of the steel pipe and the wall thickness of the steel pipe. This is the reason why no corrosion of steel tube arch rib in the limit bearing capacity compared to the localized corrosion of steel pipe arch rib in the limit bearing capacity is low.(2)Based on the experimental research, the general finite element software ABAQUS is used to simulate the test member. The three-dimensional nonlinear finite element model ofthe test member is established. Considering effects of geometric nonlinearity and material nonlinearity on the carrying capacity of test arches, finite element results and experimental results are comparative analyzed and the rationality of finite element model is verified. We analyze the difference between the two results to provide reference for the follow-up experiment. Based on the finite element calculation results, we analyze the relationship of load and deformation and the study distribution and variation of stress of steel pipe arches after corrosion in loading process.(3) Steel ribs models under different degrees of corrosion are simulated by using finite element software ABAQUS to study the effect of corrosion parameters as site, area and depth on the ultimate bearing capacity of steel tubular arch rib under in-plane half-span load.