Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 6 (June 2018) 877-885   

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  VULNERABILITY ASSESSMENT OF STEEL STRUCTURES IN DISTRICT 12 OF MASHHAD CITY AND PRIORITIZING THE WELDING DEFECTS USING THE ANALYTIC HIERARCHY PROCESS
 
R. Orangi, H. Mansourian, K. Bina and S. Rabbanifar
 
( Received: November 03, 2017 – Accepted in Revised Form: March 09, 2018 )
 
 

Abstract    Recently, steel structures have been accounted for a large percentage of the buildings due to their advantages such as higher execution speed and easier construction. In steel structures, welded joints are commonly used and their quality plays a key role in stability of buildings under applied loads. Hence, to increase resiliency of welded steel structures against natural hazards, welded joints quality should be improved. In this article, a statistical study was done on welding defects of different connections in 50 welded steel buildings that were being constructed in district 12 (Mashhad, Iran). The reasons for selecting this district were high rates of construction and high potential of hazards. Actually, initial information about joints importance and weld defects were collected by distributed questionnaires among building designer engineers and weld inspectors. In this paper, we used the Expert Choice software that works according to Analytic Hierarchy Process (AHP) to prioritize weld defects in different connections of the buildings and define management solutions to improve them. The priority results revealed that in the non-rigid connections crater, slag inclusion and spatter are more critical whereas in the rigid connections Lack of Penetration (LoP) and Lack of Fusion (LoF) are more critical than the other welding defects in steel building structures.

 

Keywords    Weld Defects, Weld Defects Management, Steel Structures, Analytic Hierarchy Process

 

چکیده    اخیرا، سازههای فولادی به دلیل مزایای ویژه مانند سرعت بالا و راحتی ساخت درصد بالایی از ساختمانها را در بر گرفتهاند. در سازههای فولادی، اتصالات جوشی عمدتا مورد استفاده قرار میگیرند که کیفیت جوشها نقش اساسی در پایداری ایفا میکنند. بنابرین برای افزایش مقاومت اینگونه سازهها در برابر حوادث طبیعی باید کیفیت اتصالات جوشی را بهبود بخشید. در این پژوهش، مطالعهای آماری بر روی عیوب جوش در اتصالات مختلف مربوط به 50 ساختمان فولادی جوشکاری شده در منطقه 12 شهرداری مشهد، ایران، انجام شده است. دلایل انتخاب این منطقه، بعنوان مورد مطالعاتی، نرخ بالای ساخت و ساز و پتانسیل بالای خطرات طبیعی در آنبوده است. همچنین، اطلاعات اولیه مربوط به اهمیت انواع اتصالات و عیوب جوش با توزیع پرسشنامه بین مهندسان عمران طراح و بازرسان جوش جمعآوری شده است. در این مقاله، نرمافزار Expert Choice انتخاب شده که براساس تحلیل سلسله مراتبی(AHP) به اولویتبندی انواع عیوب جوش در اتصالات مختلف ساختمان میپردازد تا راهکارهای مدیریتی مناسب جهت بهبود وضعیت آنها ارائه گردد. نتایج نهایی نشان میدهند در اتصالات غیرصلب، عیوب بریدگی کناره و حبس سرباره و پاشش بحرانیتر بودهاند در صورتی که در اتصالات صلب عدم نفوذ و امتزاج ناقص بحرانیتر به نظر میآیند.

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