تعیین ضریب رفتار قاب های بتن آرمه تقویت شده با سیستم قاب ستون پیوند شده فولادی

عزالدین, علیرضا; خیرالدین, علی; قلهکی, مجید

doi:10.22065/jsce.2019.183337.1848

تعیین ضریب رفتار قاب های بتن آرمه تقویت شده با سیستم قاب ستون پیوند شده فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ عمران، دانشکده عمران، دانشگاه سمنان

² استاد، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

³ دانشیار، دانشکده مهندسی عمران، دانشگاه سمنان، سمنان، ایران

10.22065/jsce.2019.183337.1848

چکیده

یکی از مناسب‌ترین راه کارها برای کاهش اثرات لرزه‌ای، استفاده از سیستم‌ سازه‌ ترکیب شده با سیستم فیوز سازه‌ی تعویض‌پذیر است که به منظور رفتار شکل‌پذیر مناسب و مستهلک کننده‌ی انرژی، در کنار اعضـای اصلی سازه می‌باشد. پایین بودن زمان، هزینه و سهولت تعمیر در این سیستم‌ها، سبب بازگشت سریع ساختمان به خدمت رسانی خواهد شد. در این تحقیق به تعیین ضریب رفتار قاب‌های بتن‌آرمه تقویت شده با سیستم قاب ستون پیوند شده فولادی با تعداد طبقات 3 و 6 طبقه با سه طول متفاوت تیر پیوند پرداخته شده است. بر‌اساس نتایج مدل سازی منحنی نیرو-تغییرمکان، ضریب رفتار و پارامترهای مربوط براساس روش انرژی معادل محاسبه شده است. نتایج حاصل از تحلیل استاتیکی غیرخطی نشان می دهد با استفاده از سیستم قاب ستون پیوند شده فولادی جهت تقویت قاب بتن‌آرمه میزان ظرفیت باربری و قابلیت جذب و استهلاک انرژی را نسبت به نمونه بدون تقویت در حدود 5/3 برابر افزایش می‌دهد و مقدار ضریب رفتار در روش طراحی حالت حدی در حدود 95/8 می‌باشد که این مقدار نسبت به قاب بتن‌آرمه بدون تقویت در حدود 71درصد بیشتر است. همچنین فاصله بین تغییرمکان متناظر با تشکیل اولین مفصل پلاستیک در تیر پیوند و تغییرمکان متناظر با تشکیل اولین مفصل پلاستیک در قاب بتن‌آرمه برای نمونه‌ای با نسبت طول تیر پیوند به طول دهانه قاب بتن‌آرمه برابر 45/0 از بقیه نمونه‌ها بیشتر می‌باشد که این باعث می‌شود کلیه‌ی آسیب‌ها به تیر پیوند که قابل تعویض بوده، وارد شده و سازه اصلی در حالت الاستیک باقی بماند و این سیستم در سطح خطر زیاد، قابلیت بازسازی سریع (RR) به سطح عملکرد خود را پیدا می‌کند.

کلیدواژه‌ها

عنوان مقاله [English]

Determination of Response Modification Factor of the RC frame retrofitted with the linked column frame system

نویسندگان [English]

Alireza Ezoddin ¹
Ali Kheyroddin ²
majid Gholhaki ³

¹ Faculty of Civil Engineering, Semnan University, Semnan, Iran,

² Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran

³ Associate Professor, Faculty of Civil Engineering, Semnan University, Semnan, Iran

چکیده [English]

The adequate solution for protecting main structural members and reducing the destructive effects of earthquakes use of structural systems combined with the replaceable fuse members, which due to the ductile behavior and seismic energy dissipation are next to the main members of the structure. Relatively low cost and easy repair process in these systems leads to rapid return to occupancy after an earthquake. In this study presents the response modification factor ‘R’ of the RC frame retrofitted with the linked column frame system with the number of floors 3- and 6-story with three different lengths of link beam. Based on the results of modeling the force-displacement curve, the R factor and related parameters are calculated based on the equivalent energy method. The results of the nonlinear static analysis, using the linked column frame system for retrofitting RC frame Can be increased the load bearing capacity and the capability of absorption and dissipation energy than a model of the RC frame without retrofitting about 3.5 times. The R factor in the Limit state method is about 8.95 which is more about 71% than a model of the RC frame without retrofitting. Also, the distance the corresponding displacement for the first plastic hinges formed in link beam and the corresponding displacement for the first plastic hinge formed in the RC frame for the model of LCF-0.8-0.45 is more than other models. This causes the damage to the replaceable link beam and the main structure is remained elastic phase and at a high risk level, this system will achieve to reach the rapid return to occupancy performance level.

کلیدواژه‌ها [English]

"Linked Column Frame System"
"Link beam"
"Plastic hinges"
"retrofit of RC frame"
"Response modification factor"

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