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Creep effect on critical strength of high-strength steel columns exposed to fire
Engineering Structures ( IF 5.5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.engstruct.2020.110971 Guo-Qiang Li , Xin-Xin Wang , Chao Zhang , Wen-Yu Cai
Engineering Structures ( IF 5.5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.engstruct.2020.110971 Guo-Qiang Li , Xin-Xin Wang , Chao Zhang , Wen-Yu Cai
Abstract Under fire conditions, the fire resistance of steel columns may be critically affected by steel creep. However, in the current codes of practice, creep effect has not been explicitly considered in determination of the high-temperature load-bearing capacity of steel columns. This may result in unsafe predictions of the load-bearing capacity of steel columns exposed to fire. In this study, both numerical and theoretical approaches are employed to study the creep effect on the critical strength of Chinese grades Q550, Q690, and Q890 high-strength steel columns. First, the creep buckling behavior of steel columns is numerically studied using the finite element program ABAQUS, and then validated against the existing experimental results. The creep buckling load factor, which is the ratio of the buckling load with creep effect to that without creep effect, is calibrated from the numerical approach and plotted against creep buckling time. The creep buckling load factor vs. buckling time curves are also established from the theoretical approach and compared with the curves established from tests and numerical analyses. A parametric study is then conducted by using a validated theoretical approach to investigate the effects of several variables including slenderness ratio, temperature, and material strength on the creep buckling load of high-strength steel columns. Based on the parametric study results together with current code of practice EN 1993-1-2, the modification factors of the buckling load with creep effect are proposed. The results demonstrate that under fire conditions without considering the creep effect, the buckling load of high-strength steel columns may be overestimated.
更新日期：2020-10-01
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