Strength design against in-plane failure of Concrete-Filled Steel Tubular arches

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Conference Proceeding
Tubular Structures XIII - Proceedings of the 13th International Symposium on Tubular Structures, 2010, pp. 615 - 622
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In current design practice, the philosophy for the strength design of reinforced and prestressed concrete arches is commonly adopted for Concrete-Filled Steel Tubular (CFST) arches. For this, the CFST arches are considered under axial or eccentric compression and are treated similarly to CFST columns. The strength design method for CSFT columns is associated with the classical buckling theory of CFST columns. However, under transverse loading, the buckling behaviour of CFST arches, particularly shallow CFST arches, is very different from that of CFST columns. In addition, transverse loading produces non-uniform compressive and bending actions in CFST arches. Hence, it is doubtful if the current method for the in-plane strength design can provide correct strength predictions for CSFT arches. This paper presents a method for the in-plane strength design of CFST circular arches using elastic-plastic finite element analyses. Lower-bound design equations for the in-plane strength check of CFST arches are proposed, and their predictions for the in-plane strength of CFST arches are compared with finite element results. © 2010 The University of Hong Kong.
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