Analysis of continuous PC box girder bridges with CSWs by using equivalent computational model
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T E C H N I C A L N OT E S
Wei Ji
· Kui Luo · Jingwei Zhang
Analysis of continuous PC box girder bridges with CSWs by using equivalent computational model
Received: 7 March 2020 / Accepted: 10 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The widespread usage of prestressed concrete (PC) box girder with corrugated steel webs (CSWs) can be attributed to its many remarkable merits over traditional concrete box girders, such as significantly reducing the deadweight of the girder, speeding up the construction process, avoiding the problem of web cracking and increasing the prestress introduction efficiency. Numerous previous studies were conducted to investigated the mechanical properties of CSWs as well as simply supported box girder bridges with CSWs, whereas very few studies focused on the FE modeling methods of continuous PC box girders with CSWs. In addition, experimental work on scale bridge models or full-scale bridges adopting the box girder with CSWs is very limited. In this paper, an equivalent orthotropic web (EOW) model was developed for CSWs and used to analyze the performance of the continuous PC box girder bridges with CSWs. To verify this model, a one-tenth-scale bridge model was developed for an existing continuous PC box girder bridge with CSWs. Both static and dynamic tests were carried out on this scale bridge model. The results obtained from the bridge finite element (FE) model with EOWs were compared to the results obtained from the bridge FE model with CSWs and also the experimental results from the scale bridge model. Good agreement was achieved between these results, indicating that the EOW model can provide a trustworthy and convenient tool in the FE analysis of PC continuous box girder bridges with CSWs. Keywords Corrugated steel web · Orthotropic web · Stiffness · Deflection · Natural frequency · Mode shape
1 Introduction Since the first prestressed concrete (PC) box girder bridge with corrugated steel webs (CSWs) was built in 1986 in France, this new type of composite box girder structure becomes an attractive concept for highway bridges [1,2]. As shown in Fig. 1, this new type of PC box girder bridges with CSWs can take full advantages of the material characteristics of the concrete flanges and CSWs. The materials are used more efficiently because concrete is expected to resist primarily the bending moment and steel is to carry shear. The widespread usage of this type of box girder with CSWs can be attributed to its many remarkable merits over traditional concrete box girder, such as significantly reducing the deadweight of the girder, speeding up the construction process, avoiding the problem of web cracking and increasing the prestress introduction efficiency [3]. Most recently, comprehensive theoretical and experimental studies have been conducted to investigate the shear stress distribution [4], flexural behavior [5,6], torsional response [7] and natural frequencies [8] of the box girder bridge with CSWs as well as the shear strength and design
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