Experimental research on fire resistance of circular steel tube column filled with steel-reinforced high-strength concrete

• Main Authors: ZHU Siyi, ZHU Meichun, ZHENG Lilan, YANG Jinghua, WANG Lvyi
• Format: Article
• Language: English
• Published: Academic Journals Center of Shanghai Normal University 2014-06-01
• Series: Journal of Shanghai Normal University (Natural Sciences)
• Subjects: composite column; concrete-filled steel tube; steel-reinforced concrete; fire resistance; experimental study
• Online Access: http://qktg.shnu.edu.cn/zrb/shsfqkszrb/ch/reader/create_pdf.aspx?file_no=201403017&flag=1&year_id=2014&quarter_id=3
• ISSN: 1000-5137; 1000-5137

Circular steel tube filled with steel-reinforced high-strength concrete is a new model of composite column design.The fire resistance of this composite column was investigated experimentally.One circular steel tube column filled with steel-reinforced high-strength concrete and one circular steel tube column filled with high- strength concrete were tested under axial load and fire.The test results show that the axial deformations of both kinds of the composite columns under the same load level have experienced three stages variation:the initial expansion deformation stage,the compression deformation gradual growth stage and the damage stage with the dramatic increasing in compression deformation.The second compression stable development stage of the circular steel tube filled with steel-reinforced high-strength concrete is much longer than that of the circular steel tube column filled with high-strength concrete.Thus the fire endurance of the circular steel tube filled with steel-reinforced high-strength concrete reaches 166 minutes while the fire endurance of the circular steel tube column filled with high-strength concrete only reaches 46 minutes.Thus encasig section steel can remarkably improve the fire endurance of the circular steel tube filled with high-strength concrete.The research results can provide beneficial reference for the fire design of circular steel tube composite columns filled with steel-reinforced concrete.