Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Vulnerability assessment of irregular steel structures under traveling fires
https://orcid.org/0000-0002-8348-4711
SummaryThis paper investigates the response of tall setback irregular steel moment resisting structures under traveling fires. A seven‐story steel regular structure (RS) is first designed for gravity and seismic loads and then it is fireproofed for a fire resistance rating (FRR) of 120 min based on the ISO834 fire. Some architectural changes are then imposed on the RS to make it a setback irregular structure (SBS). Based on the traveling fire methodology, both structures are then subjected to fire curves ranging from 1% to 100% for the fire load density (qf)of 570 MJ/m2. As in the SBS, the distribution of gravity loads is not uniform; the structural fire analyses are performed twice: when the fires start from left to right and then vice versa. The results show the FRR of the RS is minimized under the fire size of 22% with the collapse time of 87.0 min. In the SBS, when the fires start from left to right and then from right to left, the FRR is minimized under the fire size of 20% with the collapse times of 75.0 and 79.0 min, respectively. This shows that the SBS is more vulnerable toward traveling fires than the RS. In order to monitor the role ofqfin the FRRs of the structures,qfis then reduced, and the required analyses are repeated. This process continues to where no collapse is observed under all the fire sizes. The results indicate that the RS would remain stable if theqfis decreased to 480 MJ/m2, implying that a 16% increase should be considered to the required FRR. As for the SBS, theqfshould be decreased to 440 MJ/m2to make it stable, meaning that a 25% increase should be considered to the required FRR.
Vulnerability assessment of irregular steel structures under traveling fires
https://orcid.org/0000-0002-8348-4711
SummaryThis paper investigates the response of tall setback irregular steel moment resisting structures under traveling fires. A seven‐story steel regular structure (RS) is first designed for gravity and seismic loads and then it is fireproofed for a fire resistance rating (FRR) of 120 min based on the ISO834 fire. Some architectural changes are then imposed on the RS to make it a setback irregular structure (SBS). Based on the traveling fire methodology, both structures are then subjected to fire curves ranging from 1% to 100% for the fire load density (qf)of 570 MJ/m2. As in the SBS, the distribution of gravity loads is not uniform; the structural fire analyses are performed twice: when the fires start from left to right and then vice versa. The results show the FRR of the RS is minimized under the fire size of 22% with the collapse time of 87.0 min. In the SBS, when the fires start from left to right and then from right to left, the FRR is minimized under the fire size of 20% with the collapse times of 75.0 and 79.0 min, respectively. This shows that the SBS is more vulnerable toward traveling fires than the RS. In order to monitor the role ofqfin the FRRs of the structures,qfis then reduced, and the required analyses are repeated. This process continues to where no collapse is observed under all the fire sizes. The results indicate that the RS would remain stable if theqfis decreased to 480 MJ/m2, implying that a 16% increase should be considered to the required FRR. As for the SBS, theqfshould be decreased to 440 MJ/m2to make it stable, meaning that a 25% increase should be considered to the required FRR.
Vulnerability assessment of irregular steel structures under traveling fires
https://orcid.org/0000-0002-8348-4711
SummaryThis paper investigates the response of tall setback irregular steel moment resisting structures under traveling fires. A seven‐story steel regular structure (RS) is first designed for gravity and seismic loads and then it is fireproofed for a fire resistance rating (FRR) of 120 min based on the ISO834 fire. Some architectural changes are then imposed on the RS to make it a setback irregular structure (SBS). Based on the traveling fire methodology, both structures are then subjected to fire curves ranging from 1% to 100% for the fire load density (qf)of 570 MJ/m2. As in the SBS, the distribution of gravity loads is not uniform; the structural fire analyses are performed twice: when the fires start from left to right and then vice versa. The results show the FRR of the RS is minimized under the fire size of 22% with the collapse time of 87.0 min. In the SBS, when the fires start from left to right and then from right to left, the FRR is minimized under the fire size of 20% with the collapse times of 75.0 and 79.0 min, respectively. This shows that the SBS is more vulnerable toward traveling fires than the RS. In order to monitor the role ofqfin the FRRs of the structures,qfis then reduced, and the required analyses are repeated. This process continues to where no collapse is observed under all the fire sizes. The results indicate that the RS would remain stable if theqfis decreased to 480 MJ/m2, implying that a 16% increase should be considered to the required FRR. As for the SBS, theqfshould be decreased to 440 MJ/m2to make it stable, meaning that a 25% increase should be considered to the required FRR.
Vulnerability assessment of irregular steel structures under traveling fires
Structural Design Tall Build
Behnam, Behrouz (Autor:in)
10.08.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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