建筑钢结构进展2024，Vol.26Issue(6)：76-83,8.DOI:10.13969/j.cnki.cn31-1893.2024.06.008
电力火灾后圆端形不锈钢管混凝土柱轴压性能研究
Axial Compressive Behavior of Round-Ended Concrete-Filled Stainless Steel Tubular Stub Columns After Electric Power Fire
摘要
Abstract
Axial compressive tests of 14 round-ended concrete-filled stainless steel tubular(CFSST)stub columns after the electric power fire were carried out.Effects of the height-to-width ratio,fire exposure time,and steel ratio on the residual strength of the round-ended CFSST stub column after the fire were analyzed.The test shows that the failure modes of this type of short column are local buckling,weld cracking,and concrete crushing.With the increase in fire exposure time or height-to-width ratio,the residual strength of the specimen will decrease.The bearing capacity of the round-ended CFSST specimen was reduced by 7.8%-13.9%after 120 min of fire.The finite element(FE)model was then established,and the model can simulate the measured results well.A theoretical analysis based on the FE model was carried out,which shows that the initial load has a small effect on the residual strength of this composite column.Parametric analysis shows that when the strength of concrete increases from 30 MPa to 90 MPa,the strength reduction coefficient of column decreases by 15.8%.When the cross-sectional circumference increases from 1 228 mm to 4 913 mm,the strength reduction coefficient of column increases by 20.5%.When the fire exposure time increases from 0 min to 180 min,the strength reduction coefficient of column is reduced by 8%.The strength reduction coefficient of column is less affected by the steel ratio,height-to-width ratio,and steel strength.Finally,a design method for the residual strength of the CFSST stub column after the electric power fire was proposed.关键词
不锈钢管混凝土/圆端形截面/电力火灾/剩余承载力/有限元/设计方法Key words
concrete-filled stainless steel tube/round-ended section/electric power fire/residual strength/finite element/design method分类
建筑与水利引用本文复制引用
高献,王晖,宋培,王志滨,董靖怡..电力火灾后圆端形不锈钢管混凝土柱轴压性能研究[J].建筑钢结构进展,2024,26(6):76-83,8.基金项目
福建省自然科学基金(2021J01603),国家电网有限公司科技项目(5200-202156074A-0-0-00),泉州市科技计划项目(2021C015R) （2021J01603）
