بررسی رفتار اتصالات جوش شده فولادی نیمه گیردار بر رفتار لرزه ای قاب‌های فولادی سه بعدی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری رشته مهندسی عمران گرایش سازه دانشگاه علم و صنعت ایران

2 دانشیار و عضو هیئت علمی دانشکده فنی مهندسی عمران دانشگاه علم و صنعت ایران

چکیده

نظر به اینکه قاب های خمشی فولادی با اتصال گیردار یکی از سیستم‌های مقاوم در برابر بارهای جانبی مانند زلزله و باد هستند، نقش مقاومت اتصال در این قاب‌ها نقش حیاتی خواهد بود. هدف از این پژوهش، بررسی رفتار اتصالات جوش‌شده فولادی نیمه-گیردار بر رفتار لرزه‌ای قاب‌های فولادی سه بعدی است. از نتایج این پژوهش چنین برمی‌آید که با کاهش تعداد طبقات سازه، در این پروژه شکل‌پذیری سازه‌ها کاهش یافته منحنی‌های IDA در سطح IM پایین‌تری افقی می‌گردند که این موضوع نشان می-دهد که با افزایش شکل‌پذیری سازه‌ها می توان به دریفت‌های بالاتری در سازه‌ها، در یک سطح زلزله ی زلزله یکسان دست یافت. همچنین منحنی‌های پوش متناظر با سازه‌های دارای شکل پذیری کمتر در سطح بالاتری قرار می‌گیرند و به عبارتی با افزایش شکل‌پذیری در تحلیل استاتیکی غیرخطی، منحنی پوش آن در سطح پایین‌تری قرار می‌گیرد. به عبارتی با افزایش صلبیت اتصالات، سازه دارای رفتار صلب‌تری می‌باشد و منحنی پوش آنها در سطح بالاتری قرار می‌گیرد ونیز سازه‌های دارای شکل‌پذیری بیشتر، در سطح شدت لرزه‌ای پایین‌تری افقی می‌گردند و سازه‌های صلب‌تر در سطح بالاتری قرار می‌گیرند که در نتایج تحلیل استاتیکی غیرخطی نیز نمود پیدا کرده است و با کاهش صلبیت اتصالات، زمان تناوب موثر سازه نامتقارن افزایش می‌یابد و شتاب طیفی کاهش می‌یابد . همچنین با کاهش صلبیت اتصالات، درصد مشارکت مودهای بالاتر افزایش یافته بنابراین در سازه‌های دارای اتصالات نیمه صلب تعداد مودهای موثر در سازه نسبت حالت صلب بیشتر است. این موضوع در طراحی سازه می‌تواند نقش مهمی ایفا کند.با توجه به یافته های این پژوهش ،در کارهای کمی می توان بررسی همه جانبه این روش را در کشور مشاهده نمود درحالی که تا کنون پژوهشی درباره رفتار اتصالات جوش شده فولادی نیمه گیردار بر رفتار لرزه ای قاب‌های فولادی صورت نپذیرفته و تفاوت نتایج این پژوهش با توجه همه جانبه بودن آن مشهود می باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the behavior of semi-conductive welded steel joints on seismic behavior of 3D steel frames

نویسندگان [English]

  • Majid Malekzadeh 1
  • Mohsen Ali Shayanfar 2
1 PhD student in Civil Engineering, Structural Engineering, University of Science and Technology, Tehran, Iran
2 Faculty member of the Faculty of Civil Engineering, University of Science and Technology, Tehran, Iran
چکیده [English]

Given that bent steel bending frames are one of the load-resisting systems such as earthquakes and winds, the role of bonding resistance in these frames will be crucial. The purpose of this study was to investigate the behavior of semi-conductive welded steel joints on the seismic behavior of 3D steel frames. The results of this study show that with the decrease in the number of structural classes, in this project the reduced formability of the structures decreases the IDA curves to a lower IM level, indicating that with increasing Structural plasticity can be achieved by higher computations in structures at the same earthquake level. Also, the coating curves corresponding to the structures with less ductility are at a higher level, that is, the coating curve is lower at higher level, with increasing formability in nonlinear static analysis. In other words, with increasing rigidity of the joints, the structures behave more rigidly and their bending curves are higher and the structures with higher plasticity become horizontal at lower seismic intensity levels. And the rigid structures are at a higher level, which is also reflected in the results of nonlinear static analysis, and by decreasing the rigidity of the joints, the effective alternation time of the asymmetric structure increases and the spectral acceleration decreases. Also with decreasing joint rigidity, the contribution of higher modes increased, so in semi-rigid joints the number of effective mods in the structures is higher than the rigid state. This issue can play an important role in the design of the structure. According to the findings of this study, little work can be done to investigate this method in the country, although research on the behavior of welded steel joints has so far been studied.

کلیدواژه‌ها [English]

  • RBS
  • IDA
  • performance
  • Based
  • Design
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