تاثیر مهاربندهای BRB و CBF در رفتار لرزه ای سازه های فولادی تحت زلزله های حوزه نزدیک

امامی کورنده, محمد; عسکری, بهرام

تاثیر مهاربندهای BRB و CBF در رفتار لرزه ای سازه های فولادی تحت زلزله های حوزه نزدیک

نوع مقاله : ترویجی

نویسندگان

¹ استادیار، گروه مهندسی عمران، واحد تهران جنوب، دانشگاه آزاد اسلامی، تهران، ایران

² دانش آموخته کارشناسی ارشد، گروه مهندسی عمران، واحد صفادشت، دانشگاه آزاد اسلامی، تهران، ایران.

چکیده

بادبندهای کمانش ناپذیر قابلیت مستهلکشدن و جذب انرژی مناسبی را دارا میباشند. هدف از انجام این تحقیق به دست آوردن نتایج حاصل از رفتار دینامیکی سازههای فلزی و سیستم لرزهای با مهاربندهای CBF و مقایسه آن‌ها با نتایج سازه‌های فلزی مجهز به مهاربند BRB با دو سطح مقطع مختلف تحت اثر زلزله حوزه نزدیک و کنترل بهتر ساختمانها در برابر زلزله میباشد، با توجه به اینکه کشور ما در منطقه زلزله‌خیز قرارگرفته است در نظر‌گرفتن ملاحظات مربوط به زلزلههای نزدیک به گسل در طراحی طیف استاندارد زلزله اجتناب‌ناپذیر است. در این مقاله دو سازه فولادی 5 و 10 طبقه در نرمافزار Etabs مورد مدلسازی قرار گرفته است. این نرمافزار جهت طراحی اولیه عناصر سازهای انتخاب شده است و سپس با استفاده از نرمافزار Perform-3D رفتار لرزهای آنها در زلزلههای حوزه نزدیک با دو مهاربند BRB و CBF ارزیابی شده است. نتیجهی این تحقیق نشان میدهد که سازه‌های با بادبندهای کمانش ناپذیر، دارای مستهلکشدن و جذب بالای انرژی بوده و رفتاری یکسان در فشار و کشش داشته که همین امر باعث حداکثر و بیشتر شدن برش پایه و همچنین عملکرد بهتری نسبت به سازه‌های با مهاربند CBF شده است. همچنین جابجایی ساختمان را به علت سختی بالا کنترل مینمایند، در نهایت چنانچه سطح مقطع فلزی هسته مهاربند های BRB بیشتر باشد، عملکرد سازه و تغییر مکان ها بهتر کنترل میگردد. در آخر مستهلک کردن انرژی توسط این بادبند همانطور که در بالا اشاره شد در کشش و فشار مساوی و مانند دمپر جواب میدهد.

کلیدواژه‌ها

20.1001.1.20086849.1402.14.1.11.1

عنوان مقاله [English]

The Effect of BRB and CBF Braces on Seismic Behavior of Steel Structures under Near Field Earthquakes

نویسندگان [English]

Mohammad EmamiKorandeh ¹
Bahram Askari ²

¹ Assistant Professor; Department of Civil Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran

² M.Sc. Graduate, Department of Civil Engineering, Safadasht Branch, Islamic Azad University, Tehran, Iran

چکیده [English]

Buckling Restrained Brace (BRB) has the ability to wear and absorb energy well. The aim of this study was to obtain the results of dynamic behavior of metal structures and seismic system with CBF braces and compare them with the results of steel structures equipped with BRB bracing with two different cross sections due to near field earthquake and better building control. Considering that our country is located in an earthquake-prone region, it is inevitable to take into account the considerations related to near-fault earthquakes in the design of the standard earthquake spectrum. In this paper, two 5 and 10 level steel structures are modeled in Etabs software. This software was selected for the initial design of structural elements and then using Perform-3D software, their seismic behavior in near field earthquakes was evaluated with two braces BRB and CBF. The result of this study shows that structures with non-buckling braces have high energy absorption and absorption and have the same behavior in pressure and tension, which causes maximum and more base shear as well as better performance than Structures with CBF bracing. They also control the movement of the building due to its high stiffness. Finally, if the metal cross-sectional area of the BRB braces is higher, the performance of the structure and displacement will be better controlled. Finally, energy consumption by this brace, as mentioned above, responds to equal traction and pressure, like a damper.

کلیدواژه‌ها [English]

BRB
CBF
Seismic Behavior
Steel Structures
Near Field Earthquakes

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doi: 10.30469/jnace.2022.150302

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