EXPERIMENTAL STUDY ON IN-PLANE ULTIMATE LOAD-CARRYING CAPACITY OF CFST ARCHES WITH CORRUGATED STEEL WEBS

Two concrete filled steel tubular arches with corrugated steel webs (CFST-CSW arch) were tested under symmetrical and asymmetrical in-plane loadings. The measured deflections, strains of steel tube and corrugated webs, and ultimate loads are recorded. Test results show that the CFST－CSW arch, as a new composite structure, has good behaviors, in which the advantages of both corrugated steel webs and CFST chords can be exploited. Compared with the CFST single tubular arch and dumbbell shaped arch, the rigidity and bearing capacity of the CFST－CSW arch is greatly improved; And the joint failure, occurring commonly in CFST truss arch, can be avoided in CFST-CSW arch, thus its ductility and ultimate loads are improved. The FE analysis results show that the dual non-linearity should be taken into account in calculation of its ultimate load carrying capacity. The Equivalent Beam-Column method employed in CFST single tubular arch and dumbbell shaped arch, rather than the Limit State method employed in RC arch, is valid in the calculation of the ultimate load.