Typical diseases of a long-span concrete-filled steel tubular arch bridge and their effects on vehicle-induced dynamic r
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RESEARCH ARTICLE
Typical diseases of a long-span concrete-filled steel tubular arch bridge and their effects on vehicle-induced dynamic response Jianling HOUa, Weibing XUa* , Yanjiang CHENa, Kaida ZHANGa, Hang SUNb, Yan LIb a b *
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
Corresponding author. E-mail: [email protected]
© Higher Education Press 2020
ABSTRACT A long-span concrete-filled steel tubular (CFST) arch bridge suffers severe vehicle-induced dynamic responses during its service life. However, few quantitative studies have been reported on the typical diseases suffered by such bridges and their effects on vehicle-induced dynamic response. Thus, a series of field tests and theoretical analyses were conducted to study the effects of typical diseases on the vehicle-induced dynamic response of a typical CFST arch bridge. The results show that a support void results in a height difference between both sides of the expansion joint, thus increasing the effect of vehicle impact on the main girder and suspenders. The impact factor of the displacement response of the main girder exceeds the design value. The variation of the suspender force is significant, and the diseases are found to have a greater effect on a shorter suspender. The theoretical analysis results also show that the support void causes an obvious longitudinal displacement of the main girder that is almost as large as the vertical displacement. The support void can also cause significant changes in the vehicle-induced acceleration response, particularly when the supports and steel box girder continue to collide with each other under the vehicle load. KEYWORDS
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long-span arch bridge, expansion joint disease, vehicle-bridge coupling vibration, dynamic response
Introduction
The long-span concrete-filled steel tubular (CFST) arch bridge is one of the main types of bridges used in cities and highways [1,2]. It has the advantage of good spanning capacity. A steel box girder is frequently used as the main girder in this type of bridge, which exhibits less stiffness than a conventional concrete arch bridge [3]. Thus, the vehicle-induced dynamic response it exhibits during service is significant. The bridge is prone to numerous diseases due to the effect of vehicles [4]. Owing to the remarkable vehicle-induced dynamic response, various diseases, and a complex stress system [5–7], several relevant studies on this type of bridge have been conducted, primarily comprising field testing and finite element numerical analysis [8–11]. For instance, using field testing and a theoretical analysis, Roeder et al. Article history: Received Jul 1, 2019; Accepted Oct 14, 2019
[12] studied a steel-tied arch bridge with a large vibration response and serious fatigue cracking. The results showed that this type of bridge was flexible and susceptible to large deflections and vibrations caused by vehicles, which was the ma
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