چكيده به لاتين
Changes in precipitation patterns and wind patterns, rising temperatures, and the occurrence of atmospheric fluctuations due to climate change conditions have profound impacts on urban infrastructure and structures. Irregular structural buildings are particularly vulnerable to seismic events and the effects of climate change. Therefore, the development of innovative solutions to enhance the seismic performance and resilience of these buildings, especially in regions susceptible to climate change, is crucial.
This study examines the improvement of irregular structure's performance against climate change effects, focusing on wind loading and utilizing magnetorheological dampers. A total of six structures, including two regular and four irregular ones with 8 and 12 stories, were analyzed under various increased wind speed conditions including low, moderate, and severe increases. To mitigate the negative impacts of climate change conditions on the seismic performance of the structures, magnetorheological dampers were employed. The modified Bouc-Wen model was used for damper modeling, and two control scenarios including passive control and active control were considered. Also, three installation configurations of the magnetorheological damper within the floor plan were examined: 1-installation at the floor's center of mass along the x-axis, 2-installation at the floor's center of mass along the y-axis, and 3- installation at the corner of the floor plan along the x-axis.
The results indicated that by adding dampers to the structures, the maximum displacement, drift, and base shear values significantly decreased across all structures and in all climate change scenarios. Furthermore, the positioning of the damper can have a significant impact on controlling the seismic response of the structures. The damper exhibited optimal performance in two scenarios: low wind speed increase and medium wind speed increase, although it also maintained its effectiveness in the high wind speed scenario. In the best case, the reductions in maximum displacement, drift, and base shear for regular structures were 13%, 25%, and 40%, respectively, while for irregular structures, they were 20%, 41%, and 38%. This demonstrates the effective performance of these dampers in enhancing the stability and safety of steel buildings against changing climatic conditions.
