ترجمه عمران ارزیابی ضریب اصلاح رفتار در سازه های فولادی با طبقه ی نرمِ مجهز شده با دستگاه میراگر ویسکوز

ترجمه عمران - 28 صفحه

سال 2016

http://journals.sagepub.com/doi/abs/10.1177/1369433216642036

دانلود رایگان مقاله انگلیسی - اصلاح رفتار در سازه های فولادی

چکیده

طبقه ی نرم در زیر زمین ساختمان های بلند در پارکینگ ها یا فروشگاه ها قرار می گیرد. با توجه به محدودیت های موجود در معماری، ممکن است این سازه ها با اجرای اتلاف و پراکندگی انرژی زمین لرزه مانند دستگاه های میراگر ویسکوز در سطح طبقه ی نرم مجهز شوند. لذا، مرور جامع متون مربوطه نشان می دهد که تاثیر میراگر ویسکوز بر ضریب اصلاح رفتار مورد بررسی قرار نمی گیرد. بنابراین، این مقاله ضرایب اصلاح رفتار را در سازه های فولادی مجهز شده با دستگاه های میراگر ویسکوز در سطح طبقه ی نرم پیشنهاد نمی دهد و تاثیر اجرای برخی دستگاه ها در ضریب اصلاح رفتار را مورد بررسی قرار داده است. در این تحقیق، سازه های فولادی با طبقات عظیم برای ارزیابی ضریب اصلاح رفتار در نظر گرفته شدند، این تحقیق بر پایه ی سه ویژگی گردآوری شد، این سه ویژگی ضرایب یا عوامل استحکام، قابلیت تورق یا کشش و افزونگی نامیده می شوند. تحلیل استاتیکی غیر خطی شبه استاتیک با استفاده از نرم افزار المان محدود مبنی بر مدل های ساختاری و سازه ای تجهیز شده با دستگاه های میراگر اجرا شد که در مکان های مختلفی از سطح پارکینگ نصب شده بودند. هیچ دهانه ی بازی در دیگر طبقات برای نصب دستگاه های میراگر در دسترس نبود. در حالیکه ، ضرایب اصلاح رفتار ، استحکام و تورق (کشش) با تحلیل استاتیک غیر خطی ایجاد شدند. نتایج مطالعه اشکار ساخت که ضرایب اصلاح رفتار در سازه های تجهیز شده با دستگاه های میراگر بلندتر از سازه های بدون دستگاه های میراگر است. علاوه براین، مقدار و ارزش ضریب اصلاح رفتار تحت تاثیر برخی طبقات و میراگرها قرار دارد. با توجه به نتایج تحلیل در نمونه های مختلف، معادله ی دترمینانِ ضریب اصلاح رفتار در سازه های فولادی با دستگاه های میراگر ویسکوز در سطح طبقه ی نرم پیشنهاد شد.

کلید واژه ها: میراگر، ضریب تورق یا کشش، قاب ها، ضریب استحکام مفرط، ضریب اصلاح رفتار، رفتار وابسته به زمین لرزه

Abstract
The soft story located in the basement of tall buildings for parking or shopping lot. Considering the limitation in architecture, these structures may be retrofitted by implementing earthquake energy dissipation such as viscous damper devices in soft story level. Nevertheless, an extensive review of related literature indicates that the effect of viscous damper on response modification factor is not considered. Therefore, this study proposed the response modification factors for steel structures furnished with viscous damper devices in soft story level and investigated the effect of implementing such devices on the response modification factor. In this research, steel structures with numerous stories were considered to evaluate the response modification factor, which was formulated based on three aspects, namely, strength, ductility, and redundancy factors. Quasi-static nonlinear analysis was performed using finite element software based on structural models equipped with damper devices installed in different locations of the parking level. No open bay is available in other floors to install the damper devices. Meanwhile, the overstrength, ductility, and response modification factors were established by conducting pushover analysis. Results of the study revealed that the response modification factors for structures equipped with damper devices are higher than those of structures without damper devices. Moreover, the value of response modification factor was affected by the number of stories and number of dampers. Considering the analytical results for different cases, the equation for determining the response modification factor for steel structures furnished by viscous damper devices in soft story level was proposed

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