Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 28, No. 6 (June 2015) 871-879    Article in Press

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  COMPARISON OF THE PROGRESSIVE COLLAPSE RESISTANCE OF SEISMICALLY DESIGNED STEEL SHEAR WALL FRAMES AND SPECIAL STEEL MOMENT FRAMES
 
M. R. Sheidaii and S. Jalili
 
( Received: August 28, 2014 – Accepted: May 02, 2015 )
 
 

Abstract    In this study, the progressive collapse potential of seismically designed steel plate shear wall (SPSW) systems is investigated using the alternate path method, and their performances are compared with those of the conventional special moment frame (SMF) systems. Nonlinear static and dynamic analyses are conducted to follow the progressive collapse of the structures, and their ability of absorbing the destructive effects of member loss is investigated. The obtained results show that when a corner or a middle column in the first story of the SPSWs is removed, the rest of the structure is not able to provide an appropriate alternative path for redistributing the generated loads caused by member loss, and therefore the structure presents a high potential for progressive collapse. However, by changing the lateral load resisting system of these buildings with the SMFs, the progressive collapse resisting capacity of the buildings increases significantly.

 

Keywords    Progressive Collapse, Alternate Path Method, Nonlinear Static Analysis, Nonlinear Dynamic Analysis, Steel Plate Shear Wall

 

چکیده    در این مطالعه پتانسیل خرابی پیشرونده در قابهای فولادی مقاوم لرزهای مجهز به دیوار برشی فولادی (SPSW) با استفاده از روش مسیر جایگزین بررسی شده و عملکرد آنها در برابر خرابی پیشرونده با سیستمهای قاب خمشی ویژه رایج (SMF)مقایسه شده است. تحلیلهای غیرخطی استاتیکی و دینامیکی برای تعقیب وقوع خرابی پیشرونده در سازهها انجام شده و قابلیت جذب اثرات مخرب حذف عضو، بررسی شده است. نتایج بدست آمده نشان میدهد زمانی که یک ستون گوشه و یا یک ستون میانی واقع در طبقه اول از سیستم SPSW حذف میشود، سازه باقیمانده نمیتواند مسیر جایگزین مناسبی برای بازتوزیع بارهای ناشی از حذف عضو فراهم نماید و سازه پتانسیل بالایی را برای خرابی پیشرونده نشان میدهد. ولی با تغییر سیستم باربر جانبی سازه از SPSW به SMF، ظرفیت باربری سازه در برابر خرابی پیشرونده بطور چشمگیری افزایش مییابد.

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