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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:

2019年03期

Page:

66-73

Research Field:

Publishing date:

Info

Title:

Fire Resistance of Square Steel Reinforced Concrete-filled Stainless Steel Tube Columns Embedded with Cross-section Steel

Author(s):

LIU Yan-zhi¹;  DENG Ji-qian¹;  TAN Qing-hua²

(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. College of Aerospace Science, National University of Defense Technology, Changsha 410073, Hunan, China)

Keywords:

steel reinforced concrete-filled stainless steel tube column;  fire resistance;  temperature field;  numerical analysis

PACS:

TU398.9

DOI:

-

Abstract:

The steel reinforced concrete-filled stainless steel tube column was composed by embedding profile steel in the concrete-filled stainless steel tube column, which reduced the amount of stainless steel and made the column have better ductility and fire resistance. The fire resistance of square steel reinforced concrete-filled stainless steel tube column embedded with profile steel was studied by finite element simulation. Firstly, the finite element model of fire resistance performance of square steel reinforced concrete-filled stainless steel tube column under fire was established, and the temperature field and fire resistance data of relevant tests were used to fully verify the model. Based on the validated finite element model, the temperature history, axial deformation-time relationship, typical failure modes and section internal force redistribution of a typical steel reinforced concrete-filled stainless steel tube column under different load ratios were analyzed, and the working mechanism under fire was defined. At the same time, the comparative analysis with concrete-filled stainless steel tube columns with equal steel content was carried out. The results show that the embedded profile steel is helpful to improve the axial stiffness and lateral stiffness of columns at high temperature. The failure modes of steel reinforced concrete-filled stainless steel tubular columns are manifested as axial compression failure. Under low fire load ratio, because partial profile steel shares the load transferred from stainless steel, it allows stainless steel to deteriorate at higher temperatures, thereby improving its fire resistance. The lower the fire load ratio, the more remarkable the improvement effect is.

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Memo

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Common functions

Last Update: 2019-05-23