Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Analysis and calculation method for concrete-encased CFST columns under eccentric compression
Abstract This paper presents a computational method for concrete-encased concrete-filled steel tube (CFST) columns under eccentric compression, which adopts the form of equivalent rectangular stress integrated by material constitutive curve. When establishing finite element model via ABAQUS, confinement provided by stirrup was considered to modify the constitutive law of encased concrete, so that the numerical modeling was in good agreement with tests. By analyzing the simulation results, the applicability of basic assumptions, such as plane section assumption, was discussed, and a database of 207 models with various parameters was created. The developed method took into account the influences of geometric nonlinearities of section shape, and its accuracy was verified against various collected tests and the database. It turned out that the formula presented was applicable to a wide range and had sufficient precision, while the predictions of N-M interaction curves of concrete-encased CFST columns in EC4, AISC and CECS were conservative due to the ignorance of the exact integration about irregular section-shape.
Highlights A practical design method for concrete-encased CFST columns subjected to eccentric load is introduced. The accurate integration takes into account the irregular shape of sections. The equivalent coefficients are uniformly expressed by simple equations, and cover the influence of important factors. The proposed method can capture the N-M interaction of composite columns effectively.
Analysis and calculation method for concrete-encased CFST columns under eccentric compression
Abstract This paper presents a computational method for concrete-encased concrete-filled steel tube (CFST) columns under eccentric compression, which adopts the form of equivalent rectangular stress integrated by material constitutive curve. When establishing finite element model via ABAQUS, confinement provided by stirrup was considered to modify the constitutive law of encased concrete, so that the numerical modeling was in good agreement with tests. By analyzing the simulation results, the applicability of basic assumptions, such as plane section assumption, was discussed, and a database of 207 models with various parameters was created. The developed method took into account the influences of geometric nonlinearities of section shape, and its accuracy was verified against various collected tests and the database. It turned out that the formula presented was applicable to a wide range and had sufficient precision, while the predictions of N-M interaction curves of concrete-encased CFST columns in EC4, AISC and CECS were conservative due to the ignorance of the exact integration about irregular section-shape.
Highlights A practical design method for concrete-encased CFST columns subjected to eccentric load is introduced. The accurate integration takes into account the irregular shape of sections. The equivalent coefficients are uniformly expressed by simple equations, and cover the influence of important factors. The proposed method can capture the N-M interaction of composite columns effectively.
Analysis and calculation method for concrete-encased CFST columns under eccentric compression
Ke, Xiaojun (Autor:in) / Wei, Haibin (Autor:in) / Yang, Linjie (Autor:in) / Sun, Haiyang (Autor:in)
25.03.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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