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A platform for research: civil engineering, architecture and urbanism
Linear elastic iteration technique for ultimate bearing capacity of circular CFST arches
Abstract The current primary numerical methods for ultimate bearing capacity of concrete-filled steel tube (CFST) arches are of nonlinear iterative procedures, which are time consuming and inaccurate. In order to overcome this problem, a linear elastic iteration technique was introduced for plastic limit analysis of the CFST arches with small or medium nominal slenderness ratio in this paper. Firstly, generalized yield functions were derived from the interaction equation of circular CFST members. Then, homogeneous generalized yield functions (HGYF) with appropriate order powers were developed by means of regression analysis. Furthermore, a reference element bearing ratio was presented as a dynamic threshold to distinguish the highly-stressed elements in CFST arches on basis of the HGYFs, while an adaptive strategy of elastic modulus adjustment is presented for linear elastic iterative analysis of the ultimate bearing capacity of CFST arches with small or medium nominal slenderness ratio. Test data for ultimate strength of 100 CFST members and arches were adopted in examples to demonstrate the accuracy and efficiency of the proposed HGYF and the linear elastic iteration method. It was also verified that the proposed method can be successfully applied to common single-circular-tube CFST arches under consideration of buckling effect in engineering practice.
Highlights A homogeneous generalized yield function was developed for circular CFST members under combined loadings; The EMAPs were extended to structures made up of heterogeneous composite materials for the first time; The proposed method can achieve higher accuracy and efficiency.
Linear elastic iteration technique for ultimate bearing capacity of circular CFST arches
Abstract The current primary numerical methods for ultimate bearing capacity of concrete-filled steel tube (CFST) arches are of nonlinear iterative procedures, which are time consuming and inaccurate. In order to overcome this problem, a linear elastic iteration technique was introduced for plastic limit analysis of the CFST arches with small or medium nominal slenderness ratio in this paper. Firstly, generalized yield functions were derived from the interaction equation of circular CFST members. Then, homogeneous generalized yield functions (HGYF) with appropriate order powers were developed by means of regression analysis. Furthermore, a reference element bearing ratio was presented as a dynamic threshold to distinguish the highly-stressed elements in CFST arches on basis of the HGYFs, while an adaptive strategy of elastic modulus adjustment is presented for linear elastic iterative analysis of the ultimate bearing capacity of CFST arches with small or medium nominal slenderness ratio. Test data for ultimate strength of 100 CFST members and arches were adopted in examples to demonstrate the accuracy and efficiency of the proposed HGYF and the linear elastic iteration method. It was also verified that the proposed method can be successfully applied to common single-circular-tube CFST arches under consideration of buckling effect in engineering practice.
Highlights A homogeneous generalized yield function was developed for circular CFST members under combined loadings; The EMAPs were extended to structures made up of heterogeneous composite materials for the first time; The proposed method can achieve higher accuracy and efficiency.
Linear elastic iteration technique for ultimate bearing capacity of circular CFST arches
Yang, LuFeng (author) / Xie, WeiWei (author) / Zhao, YuFeng (author) / Zheng, Jian (author)
2020-04-30
Article (Journal)
Electronic Resource
English
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