Experimental and numerical investigation on the pier-girder fixed connection in a steel-concrete composite continuous rigid frame bridge
Miao Su,Guanyu Liu,Yiyun Yang,Jianbo Yi,Hui Peng
Abstract
The pier-beam fixed system of bridges enhances structural stiffness and reduces positive flexural moment at the mid-span. However, as the structure of composite girder-pier fixed region is usually of large stresses and structural complexity, its mechanical performances usually need specific research. In this study, the structural behavior of the steel-concrete composite pier-girder fixed region of a specific continuous rigid frame bridge was investigated by experiment and numerical simulation. Notably, a scaled specimen with a 1/6 ratio was manufactured and loaded to assess its behavior. The nonlinear finite element model (FEM) analysis, considering material damage and steel-concrete interfacial bond-slip behavior, was then conducted to study the stress distribution, deformation, and bearing capacity. The experimental results show that the specimen remains within the elastic range under the 1.38 times of the design load, with no observed cracks in the concrete bridge deck or steel girder during the experimental loading process. The results obtained from the corresponding FEM, including the load-displacement curves, loadstress curves, stress distribution, agreed well with the experiment. Furthermore, the ultimate capacity of the pier-to-girder fixed region of the actual bridge was obtained by conducting nonlinear FEM analysis. The failure mode observed was the crack failure in the concrete bridge deck. When the load reaches 4.5 times of the design load, the fixed region cannot withstand additional load due to the instability propagation of concrete cracks. This study clarifies the stress characteristics of the fixed connection of the composite bridge and can provide some guidance for the design and analysis of similar structures.
Key Words
bridge engineering; composite beams; finite element analysis; load-bearing capacity; scale model test
Address
Miao Su, Hui Peng — 1) Key Laboratory of Safety Control of Bridge Engineering, Ministry of Education (Changsha University of Science & Technology), Changsha 410114, Hunan, China; 2) School of Civil and Environmental Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
Guanyu Liu — School of Civil and Environmental Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
Yiyun Yang — 1) Key Laboratory of Safety Control of Bridge Engineering, Ministry of Education (Changsha University of Science & Technology), Changsha 410114, Hunan, China; 2) Zhongnan Survey and Design Institute Group Co., Ltd, Wuhan 430000, Hubei, China
Jianbo Yi — CCCC First Highway Engineering Group Co., Ltd, Lishui 323000, Zhejiang, China
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