原文传递
Investigation on Postfire Residual Capacity of High-Strength Steel Columns with Axial Restraint
| 题名： | Investigation on Postfire Residual Capacity of High-Strength Steel Columns with Axial Restraint |
| 正文语种： | 英文 |
| 作者： | Guo-Qiang Li; Jiarong Miao; Linxin Song; Wenyu Cai; and Jian Jiang |
| 作者单位： | Tongji Univ.,;Guangzhou Design Institute;Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering |
| 关键词： | invest；column；strain；fire；axia；stig；rest；post；behavior；apac |
| 摘要： | This paper experimentally and analytically investigates the fire and postfire behavior of axially restrained high-strength steel columns. Tests on the buckling behavior during heating as well as the residual load-bearing capacity after heating are first conducted on the column specimens made of Grade Q550 steel with a yield strength of 730 MPa. A numerical model is established and validated against the test results, and parametric studies are conducted with influencing factors including the maximum temperature, load ratio, slenderness ratio, and steel grade. A simplified calculation method is proposed to determine the residual capacity of restrained high-strength steel columns. The experimental results show that restrained high-strength steel columns buckle at a low temperature of about 300°C. The postfire residual capacity and axial stiffness of the columns are significantly reduced to a level of 55% and 32% of its initial values, respectively, due to the presence of a residual bending deformation. The numerical results show that the residual strength decreases greatly if the maximum temperature of a column is higher than its buckling temperature. The axial stiffness ratio and slenderness ratio have a significant influence on the residual capacity of restrained high-strength steel columns at buckling temperatures, while the axial load ratio has a significant in・ fluence at critical temperatures. However, the steel grade has little influence on the residual capacity of restrained high-strength steel columns. |
| 出版日期： | 2020.09 |
| 出版年： | 2020 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.146 |
| 期： | No.09 |
| 页码： | 04020182 |
相关文献
- Structural Response and Residual Capacity of S700 High-Strength Steel CHS Columns after Exposure to Elevated Temperatures
- Axial load behavior of reinforced concrete columns with high-strength steel coiled strips as confinement
- Axial load behavior of reinforced concrete columns with high-strength steel coiled strips as confinement
- Axial load behavior of reinforced concrete columns with high-strength steel coiled strips as confinement
- Investigation of Concrete-Filled Double-Skin Steel Tubular Columns with Ultrahigh-Strength Steel
- Experimental Behavior of Concrete-Filled Steel Tube Columns Using Ultrahigh-Strength Steel
检索历史
应用推荐
