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作者:

Lin, Siqi (Lin, Siqi.) | Yan, Xi-Feng (Yan, Xi-Feng.) | Yang, Di (Yang, Di.) | Zhao, Yan-Gang (Zhao, Yan-Gang.)

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摘要:

This paper develops a nonlinear model for the analysis of circular CFST columns under equal and unequal end moments using fiber beam element (FBE) method. An iterative process adopting Newton's method combined with secant method was proposed to improve the calculation efficiency. A test database was collected to assess the accuracy of the proposed model regarding the prediction of axial load-bearing capacity, deflection curves and load-deflection curves. The verified model was then further used to investigate the behavior of CFST columns under different end moments. It was found that the normalized sectional locations of maximum deflection of CFST columns are only significantly affected by the end moment ratio, whereas those of critical sections are also influenced by the axial load. The specimen with a larger end moment ratio, steel strength, L/D ratio and/or a smaller e1/D ratio, D/t ratio experiences more significant second order effect. The bending stiffness of CFST columns is hardly affected by the end moment ratio. Moreover, the current codes, i.e., EC4 and AISC 360, may underestimate the capacities of CFST columns under unequal end moments.

关键词:

Double curvature bending Concrete -filled steel tube columns Fiber beam element model Unequal end moments

作者机构:

  • [ 1 ] [Lin, Siqi]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 2 ] [Zhao, Yan-Gang]Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China
  • [ 3 ] [Yan, Xi-Feng]Xian Univ Architecture & Technol, Sch Civil Engn, Xian 710055, Peoples R China
  • [ 4 ] [Yang, Di]Kanagawa Univ, Dept Architecture & Bldg Engn, Yokohama, Kanagawa 2218686, Japan

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来源 :

CONSTRUCTION AND BUILDING MATERIALS

ISSN: 0950-0618

年份: 2023

卷: 409

7 . 4 0 0

JCR@2022

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