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- 저자 : Changyong Liu (검색결과 2 건)
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In-Plane Stability of Concrete-Filled Steel Tubular Parabolic Truss Arches
Changyong Liu,Qing Hu,Yuyin Wang,Sumei Zhang 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.4
For determining the in-plane buckling resistance of a concrete-fi lled steel tubular (CFST) arch, the current technical code GB50923-2013 specifi es the use of an equivalent beam-column method which ignores the eff ect of rise-to-span ratio. This may induce a gap between the calculated result and actual stability capacity. In this study, a FE model is used to predict the buckling behavior of CFST truss arches subjected to uniformly distributed loads. The infl uence of rise-to-span ratio on the capacity of truss arches is investigated, and it is found that the stability capacity reduces as rise-to-span ratio declines. Besides, the calculations of equivalent slenderness ratio for diff erent truss sections are made to consider the eff ect of shear deformation. Moreover, based on FE results, a new design equation is proposed to predict the in-plane strength of CFST parabolic truss arches under uniformly distributed loads.
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Qing Hu,Changyong Liu,Changchun Yuan,Yuyin Wang,Sumei Zhang 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.6
This paper deals with experimental investigations into in-plane stability of fi xed concrete-fi lled steel tubular (CFST) parabolic arches. Three CFST arches with the same span but diff erent rise-to-span ratios were tested under fi ve-point symmetrical concentrated loads over the full span. All applied loads were controlled in synchronization. The test results show that the test arches buckled in an antisymmetric failure mode and the section positions with the maximum deformation were slightly diff erent for three test arches. It is found that the bearing capacity of CFST arches decreased signifi cantly with the decline of rise-to-span ratios, and the outer steel tube provided signifi cant confi nement eff ects on the core concrete after the load reaches 80% of the load-carrying capacity. Moreover, comparisons between the test and fi nite element results indicate that the existing beam-element modeling method can predict the in-plane stability performance of CFST arches very well.
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