In-Plane Strength and Design of Fixed Concrete-Filled Steel Tubular Parabolic Arches
Publication: Journal of Bridge Engineering
Volume 20, Issue 12
Abstract
Concrete-filled steel tubular (CFST) arch bridges have the advantages of high compressive strength, light self-weight, and convenience in construction, and thus have been widely used in recent years. The current codes or specifications use the equivalent beam–column method to predict the in-plane strength of CFST arches. In this method, the CFST arches are considered under central or eccentric axial compression and are treated similarly to CFST columns. However, different from the CFST columns, the in-plane strength of CFST arches is affected by not only the slenderness ratio but also the rise–span ratio. Especially for the arches with small rise–span ratios, the prebuckling deformation becomes quite nonlinear, leading to a remarkable decrease in in-plane strength. Therefore, it is doubtful if the current method for in-plane strength design of CFST arches can provide correct predictions. In this paper, the elastic buckling and elastic–plastic buckling behaviors of fixed CFST parabolic arches that are subjected to uniform axial compression are investigated. The effect of the rise–span ratio on both the elastic buckling load and the in-plane strength are studied. A new method for the prediction of the in-plane strength of fixed CFST parabolic arches that are subjected to uniform axial compression is developed by considering both the slenderness ratio and the rise–span ratio.
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Acknowledgments
The work described in this paper was supported by the National Natural Science Foundation of China (No. 51208148), China Postdoctoral Science Foundation–funded projects (No. 2012M520746 and No. 2014T70345), the National Science and Technology Pillar Program during the 12th Five-Year Plan Period (2011BAJ09B02-03), the Heilongjiang Postdoctoral funded project (No. LBH-Z12106), and the Fundamental Research Funds for the Central Universities (HIT.NSRIF.2013114). The support from these institutions is gratefully acknowledged.
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© 2015 American Society of Civil Engineers.
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Received: Mar 13, 2014
Accepted: Dec 12, 2014
Published online: Apr 24, 2015
Discussion open until: Sep 24, 2015
Published in print: Dec 1, 2015
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