بررسی اثر آتش بر پایداری و مقاومت جانبی دیوارهای برشی فولادی با ورق نازک.

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری سازه، دانشکده مهندسی عمران، دانشگاه سمنان

2 عضو هیات علمی دانشگاه سمنان

3 دانشگاه فردوسی مشهد

چکیده

دیوار برشی فولادی به عنوان یک سیستم باربر جانبی در برخی سازه‌های بلندمرتبه جهان مورد استفاده قرار گرفته و به دلیل سختی، مقاومت، شکل‌پذیری و جذب انرژی مناسب و همچنین کاهش وزن اسکلت می‌تواند در آینده جایگزین برخی از سیستم‌های باربر مرسوم شود. از طرفی نیز در دهه اخیر خطرات و اثر آتش سوزی بر سیستم سازهای ساختمان ها موردتوجه واقع شده که این مساله در سازه‌های بلندمرتبه و خاص دارای اهمیت ویژه‌ای است. در سیستم دیوار برشی فولادی با ورق نازک توجه به ضخامت کم ورق‌های دیوارها، اثرات آتش بر پایداری و کاهش مقاومت جانبی آنها می‌تواند قابل توجه باشد. بر این اساس در این مقاله اثر حرارت ناشی از آتش سوزی بر پایداری، سختی الاستیک و مقاومت تسلیم یک دیوار برشی فولادی سه طبقه مورد مطالعه قرار گرفته است. نتایج تحلیل‌های همبند تنش-حرارت نشان داد که افزایش ضخامت ورق باعث کاهش چشمگیر تغییرشکل ستون می‌شود. همچنین افزایش ضخامت و تنش تسلیم ورق در کاهش کمتر مقاومت تسلیم و سختی الاستیک سیستم پس از آتش‌سوزی موثر بوده اما در ضخامت ثابت ورق، سختی الاستیک سیستم با افزایش تنش تسلیم ثابت می‌ماند. بر اساس نتایج، روابط ساده‌ای جهت محاسبه کاهش سختی الاستیک و مقاومت تسلیم سیستم پس از آتش‌سوزی، به دست آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

An Investigation into the Impact of Fire on Lateral Stability and Strength of Thin Steel Plate Shear Walls

نویسندگان [English]

  • ghasem pachideh 1
  • majid gholhaki 2
  • yoones noori 3
1 Phd Candidate, civil faculty, semnan university
3 ferdowsi university
چکیده [English]

The SPSWs has been enthusiastically applied in some of the tall buildings across the world as a novel lateral load-bearing system and due to their proper stiffness, strength, ductility, and energy absorption, as well as remarkable reduction in buildings’, weigh compared to the concrete cases, they are deemed as an efficient alternative for the traditional load-resisting systems. Fire-related hazards and their impacts on the structural systems have been of major concern for practitioners, which is of utmost significance for special structures and tall buildings. Accordingly, in the case of thin steel plate shear walls, fire is most likely to leave detrimental effects on the lateral stability and strength of them due to their small values of thickness. To better understand the behavior of such systems in the event of a fire, this paper aims to investigate the impact of heat caused by a fire on the stability, elastic stiffness and yield strength of a 3-storey frame equipped with SPSW system. Based on the results derived by connected stress-heat analyses, thickening the wall results in a substantial reduction in the column’s deformations. Moreover, an increase in thickness and yield strength of the steel plate plays an effective role in less reduction in yield strength and elastic stiffness of the system after fire events although, while the plate thickness is kept constant, the system’s elastic stiffness does not vary as the yield strength raises. In addition, simple relations were achieved to estimate the post-fire elastic stiffness and yield strength of the SPSW system.

کلیدواژه‌ها [English]

  • Steel Plate Shear Wall
  • Fire Condition, Stability
  • Elastic Stiffness
  • Yield strength
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