بررسی عددی رفتار لرزه ای سیستم دیوار بتنی پس کشیده مرکزگرا دارای میراگر اصطکاکی

نوع مقاله : مقاله پژوهشی

نویسندگان

• سینا حیرانی مقدم
• احمد شوشتری

دانشکده مهندسی، دانشگاه فردوسی مشهد

10.22067/jfcei.2022.71012.1044

چکیده

طراحی لرزه­ای سازه­ها باید به نحوی صورت گیرد که هزینه­های تعمیر سازه پس از وقوع زلزله به حداقل برسند. سیستم­های مرکزگرا هم‌چون دیوار بتنی پس­کشیده­ این هدف را تأمین می­کنند. در این پژوهش برای مقایسه رفتار لرزه­ای سیستم پیشنهادی دیوار بتنی پس­کشیده دارای میراگر اصطکاکی با سیستم دیوار بتنی پس­کشیده دارای میلگردهای مستهلک‌کننده و دیوار برشی بتنی معمولی، سه سیستم مذکور در ساختمان­های سه، شش و ده طبقه با استفاده از نرم­افزار OpenSees تحت اثر بارگذاری چرخه­ای و تحلیل تاریخچه‌زمانی قرار می­گیرند. ضریب جذب انرژی در مجموع چرخه­های بارگذاری اعمالی در دیوار بتنی پس­کشیده دارای میراگر اصطکاکی برای سازه­های سه، شش و ده طبقه به‌ترتیب 37/1، 40/1 و 02/2 برابر دیوار بتنی پس­کشیده دارای میلگردهای مستهلک‌کننده و 15/1، 05/1 و 72/1 برابر دیوار برشی بتنی معمولی است. تحت اثر هفت رکورد زلزله اعمالی میانگین جابه‌جایی جانبی نسبی حداکثر طبقات پایین در سیستم دیوار برشی بتنی معمولی کمتر از دو سیستم دیگر و میانگین جابه‌جایی جانبی نسبی حداکثر در طبقات بالا در سیستم دیوار بتنی پس­کشیده دارای میراگر اصطکاکی کمتر از سایر سیستم­ها است.

کلیدواژه‌ها

• دیوار بتنی پس کشیده مرکزگرا
• میراگر اصطکاکی
• میلگردهای مستهلک کننده
• بارگذاری چرخه ای
• تحلیل تاریخچه زمانی

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عنوان مقاله [English]

Numerical investigation of the seismic behavior of self-centering post-tensioned concrete wall system with friction-based damper

نویسندگان [English]

• Sina Heyrani Moghaddam
• Ahmad Shooshtari

Department of Civil Engineering, Engineering Faculty, Ferdowsi University of Mashhad

چکیده [English]

The seismic design of buildings ought to be done to decrease the expenses of building repairing after an earthquake. Self-centering systems such as the post-tensioned concrete wall can provide this purpose. In this study, to evaluate the seismic behavior of the post-tensioned concrete wall with friction-based damper (FBD), the proposed system, the post-tensioned concrete wall with energy dissipator (ED) bars, and the concrete shear wall are subjected to the cyclic and nonlinear response history analyses at three, six, and ten-story buildings using OpenSees software. Based on the cyclic analysis, the total energy dissipation coefficients for the post-tensioned concrete wall with FBD in three, six, and ten-story buildings are respectively 1.37, 1.40, and 2.02 times of that obtained for the post-tensioned concrete wall with energy dissipator bars system, and are respectively 1.15, 1.05, and 1.72 times of that achieved for the concrete shear wall system. According to the results of the applied seven earthquake records, the average of the maximum drift in the concrete shear wall system is less than the other systems in the lower floors, and the average of the maximum drift in the upper floors in the post-tensioned concrete wall with FBD is less than the other systems.

کلیدواژه‌ها [English]

• Self-Centering post-tensioned concrete wall
• Friction-based damper
• Energy dissipators bars
• Cyclic loading
• Nonlinear response history analysis

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