中空夹层圆钢管混凝土短柱的压弯承载力计算法

Translated title of the contribution: Load Bearing Capacity Calculation Method of Circular Concrete-Filled Double Skin Steel Tubular Stub Columns

Yangyu Chen, Jihui Ning, Yongxin Zhang, Siwei Liu, Xueyou Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

When a circular concrete-filled double skin tubular (CFDST) stub column is subjected to compression, the inside concrete is in a tri-axial stressing state due to the confining actions induced by the internal and external steel tubes. Consequentially, the compression strength might be increased, which is directly affected by the lateral confining stress applied on the concrete core. The section sizes and axial force levels are two main factors that have influences on this effect. Current design methods assume the confining stress is the same under the loading actions of pure-bending and axial-compression, but it is not clearly stated how to consider the stress under the eccentric pressure. This research proposes a lateral confining stress coefficient β to revise the concrete constitutive model for a more accurate calculation of the confining actions on concrete. A new stress integration method is proposed in this paper for computing the section capacity of stub columns under the ultimate limited state, and the axial-moment (N-M) strength interaction curve can be accordingly generated. Finally, a few several examples are provided for demonstrating the accuracy of the proposed method.

Translated title of the contributionLoad Bearing Capacity Calculation Method of Circular Concrete-Filled Double Skin Steel Tubular Stub Columns
Original languageChinese (Simplified)
Pages (from-to)85-93
Number of pages9
JournalProgress in Steel Building Structures
Volume23
Issue number12
DOIs
Publication statusPublished - 31 Dec 2021
Externally publishedYes

Keywords

  • Calculation of section bearing capacity
  • Concrete-filled double skin steel tube
  • Constitutive relationship of concrete
  • Eccentric pressure
  • Stub column

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Numerical Analysis
  • Building and Construction
  • Metals and Alloys

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