Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Collapse performances of steel frames against fire considering effect of infill walls
Abstract This study numerically investigates effect of infill walls on collapse performances of three-dimensional (3D) steel frames against fire using explicit nonlinear dynamic analysis. Two eight-story, five-span with three-bay composite steel frames were designed, one of which has no infill walls (bare frame) while the other one has infill walls (infilled frame). The fire resistance, load redistribution mechanisms of the structures subjected to single compartment fire are investigated. Frame analysis against traveling fires is also conducted. Moreover, the effect of parameters including load ratio, opening percentage and number of infill walls are also studied. Results indicate that the damaged compartment moves down in fire and drags the other part of the frame, causing overturning deformation in the frame in the short span and the twist of the entire structure. The infill walls decrease the buckling temperature of the heated columns, whereas significantly increase the collapse temperature of the steel frames. The strut action of infill walls drastically changes internal forces within adjacent columns, significantly altering load redistribution path of steel frames against fire. The collapse modes of the steel frames can be greatly altered by the presences of infill walls. The steel frames collapse at a lower temperature with increasing load ratio and opening percentage of infill walls, whereas collapse at a higher temperature with more infill walls. Finally, a preliminary analytical approach is proposed to predict collapse modes of steel frames against traveling fire.
Graphical abstract We Investigate the collapse mechanisms of 3D steel frames with/without infill walls against fire and identify two distinct collapse modes of steel frames against traveling fire due to the influence of infill walls. Display Omitted
Highlights Investigate the collapse mechanisms of 3D steel frames with infill walls against fire. Infill walls increase the robustness while change the load redistribution pattern of steel frames. Identify two distinct collapse modes of steel frame against traveling fire due to the influence of infill walls. Propose a preliminary analytical method to predict the collapse modes of steel frames.
Collapse performances of steel frames against fire considering effect of infill walls
Abstract This study numerically investigates effect of infill walls on collapse performances of three-dimensional (3D) steel frames against fire using explicit nonlinear dynamic analysis. Two eight-story, five-span with three-bay composite steel frames were designed, one of which has no infill walls (bare frame) while the other one has infill walls (infilled frame). The fire resistance, load redistribution mechanisms of the structures subjected to single compartment fire are investigated. Frame analysis against traveling fires is also conducted. Moreover, the effect of parameters including load ratio, opening percentage and number of infill walls are also studied. Results indicate that the damaged compartment moves down in fire and drags the other part of the frame, causing overturning deformation in the frame in the short span and the twist of the entire structure. The infill walls decrease the buckling temperature of the heated columns, whereas significantly increase the collapse temperature of the steel frames. The strut action of infill walls drastically changes internal forces within adjacent columns, significantly altering load redistribution path of steel frames against fire. The collapse modes of the steel frames can be greatly altered by the presences of infill walls. The steel frames collapse at a lower temperature with increasing load ratio and opening percentage of infill walls, whereas collapse at a higher temperature with more infill walls. Finally, a preliminary analytical approach is proposed to predict collapse modes of steel frames against traveling fire.
Graphical abstract We Investigate the collapse mechanisms of 3D steel frames with/without infill walls against fire and identify two distinct collapse modes of steel frames against traveling fire due to the influence of infill walls. Display Omitted
Highlights Investigate the collapse mechanisms of 3D steel frames with infill walls against fire. Infill walls increase the robustness while change the load redistribution pattern of steel frames. Identify two distinct collapse modes of steel frame against traveling fire due to the influence of infill walls. Propose a preliminary analytical method to predict the collapse modes of steel frames.
Collapse performances of steel frames against fire considering effect of infill walls
Shan, Sidi (Autor:in) / Li, Shuang (Autor:in)
05.04.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Influence of masonry infill walls on fire-induced collapse mechanisms of steel frames
| British Library Online Contents | 2019