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Fire Resistance of Square Tubed Steel Reinforced Concrete Columns in Relative Fires(PDF)

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

Issue:
2020年03期
Page:
91-98
Research Field:
Publishing date:

Info

Title:
Fire Resistance of Square Tubed Steel Reinforced Concrete Columns in Relative Fires
Author(s):
ZHANG Yu-zhuo1;  LIU Yu-jie2;  LYU Xue-tao3
(1. School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China; 2. China Railway Construction Engineering Group Shandong Co., Ltd, Qingdao 266000, Shandong, China; 3. School of Transportation and Civil Engineering, Foshan University, Foshan 528000, Guangdong, China)
Keywords:
square tubed steel reinforced concrete column;  relative fire;  fire resistance;  steel content
PACS:
TU352.5
DOI:
10.19815/j.jace.2018.05050
Abstract:
In order to study the fire resistance of square tubed steel reinforced concrete columns in relative fires, the finite element model of square tubed steel reinforced concrete columns under ISO 834 standard fire curve was established by using ABAQUS, including temperature field analysis model and fire resistance analysis model. The model was analyzed and verified by the existing related experiments. The change rules of the temperature field and mechanical properties of the section were analyzed.On this basis, the influences of load ratio, calculation length,steel content of steel, dimensions, concrete strength and other parameters on the fire resistance of the component were analyzed. Based on the above rules and combined with a large number of calculation results, the simplified calculation formula for the fire resistance of the confined steel concrete columns with square steel tubes on two sides subjected to fire was given quantitatively. The results show that the load ratio and the calculated length have great influence on the fire resistance, with the increase of the load ratio and the calculation length, the fire resistance of components decrease linearly. The section dimensions has a greater influence on the fire resistance of the component, and the fire resistance of the component increases with the section dimensions. With the increase of the steel content of steel, the increase of the fire resistance of the components is not obvious.The formula has a good calculation accuracy and can be used for the concrete column fire resistance of square steel tubes confined by two sides of fire.

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Last Update: 2020-06-08