بررسی ظرفیت لرزه ای و احتمال فروریزش ساختمان های بلند فولادی با سیستم هسته مهاربندی و مهار بازویی با استفاده از منحنی های شکنندگی و پروفیل خسارت

نویسندگان
فرهاد دانشجو
الهام احمدی
دانشگاه تربیت مدرس
چکیده
- نوع سازه‌ای مهار بازویی و کمربند خرپایی کارایی زیادی در کاهش پاسخ سازه‌های بلند در برابر بارهای جانبی دارد با این وجود، مهار بازویی به عنوان یک سیستم لرزه ای در آیین‌نامه‌های طراحی موجود آورده نشده است. در این پژوهش رفتار لرزه‌ای ساختمان‌های بلند با مهار بازویی بررسی می شود و تأثیر اضافه کردن مهار بازویی بر ظرفیت لرزه‌ای متناظر با سطح عملکرد آستانه فروریزش، تقاضای متناظر با شروع ناپایداری کلی، نحوه توزیع نیاز لرزه‌ای در ارتفاع و منحنی های شکنندگی در سطح عملکردی آستانه فروریزش مورد مطالعه قرار می گیرد. بدین منظور درابتدا سه ساختمان 20، 25 و 30 طبقه به صورت سه بعدی طراحی شده اند به طوری که اثرات مهار بازویی در طراحی اولیه در نظر گرفته نشده است و به لحاظ مقاومت اعضا و هم‌چنین تغییر مکان نسبی طبقات از حدود آئین‌نامه عبور کرده‌اند. سپس در هر ساختمان یکی از قاب‌های میانی با سیستم ترکیبی قاب خمشی و مهاربند همگرا ، با استفاده از نرم‌افزار Opensees به صورت دو بعدی مدل شده و رفتار غیر ارتجاعی قاب ها در دو حالت وجود و عدم وجود مهار های بازویی با استفاده از تحلیل دینامیکی غیر خطی فزاینده IDA بررسی شده است. نتایج نشان می‌دهد سازه‌های مجهز به مهار
ساختمان بلند، سیستم مهار بازویی وکمربند خرپایی، رفتار لرزه ای، تحلیل دینامیکی غیر خطی فزاینده IDA.

کلیدواژه‌ها

عنوان مقاله English

Seismic capacity and possibility of collapse of tall steel buildings with outrigger system using failure curves and damage profiles]

چکیده English

forms of the outrigger or belt truss structure have high performance in reducing the response of tall structures against side loads. However outriggers system are not considered as a seismic system in design codes. In this paper seismic behavior of tall buildings with outriggers will be checked and the effect of adding outrigger on the seismic behavior of steel tall structures in term of capacity of seismic intensity corresponding to the level of performance of collapse, Distribution of seismic requirements in high of structures demand curves corresponding to the general instability of structures and Fragility curves will be studied. Therefore, in the first three buildings of 20, 25 and 30 floors in three dimensions are designed so that the effects of outriggers not considered in the initial design and in terms of members resistance and the relative displacement (drift) have passed some regulations.
To do this, the three structures is designed using 3D model So that the effects of outrigger are not considered in the initial design and in terms of resistance members as well as the relative displacement of stories have passed limits of design code. and then one of main frame of structure is analyzed using “Opensees” software and moment frame structural system and CBF with regard to inelastic behavior in both the presence and absence of outrigger checked by IDA analysis. The results show
Keywords: Tall Building, Outrigger and Belt Truss, Seismic behavior, Incrimental Daynamic Analysis.
forms of the outrigger or belt truss structure have high performance in reducing the response of tall structures against side loads. However outriggers system are not considered as a seismic system in design codes. In this paper seismic behavior of tall buildings with outriggers will be checked and the effect of adding outrigger on the seismic behavior of steel tall structures in term of capacity of seismic intensity corresponding to the level of performance of collapse, Distribution of seismic requirements in high of structures demand curves corresponding to the general instability of structures and Fragility curves will be studied. Therefore, in the first three buildings of 20, 25 and 30 floors in three dimensions are designed so that the effects of outriggers not considered in the initial design and in terms of members resistance and the relative displacement (drift) have passed some regulations.
To do this, the three structures is designed using 3D model So that the effects of outrigger are not considered in the initial design and in terms of resistance members as well as the relative displacement of stories have passed limits of design code. and then one of main frame of structure is analyzed using “Opensees” software and moment frame structural system and CBF with regard to inelastic behavior in both the presence and absence of outrigger checked by IDA analysis. The results show
Keywords: Tall Building, Outrigger and Belt Truss, Seismic behavior, Incrimental Daynamic Analysis.
To do this, the three structures is designed using 3D model So that the effects of outrigger are not considered in the initial design and in terms of resistance members as well as the relative displacement of stories have passed limits of design code. and then one of main frame of structure is analyzed using “Opensees” software and moment frame structural system and CBF with regard to inelastic behavior in both the presence and absence of outrigger checked by IDA analysis. The results show
Keywords: Tall Building, Outrigger and Belt Truss, Seismic behavior, Incrimental Daynamic Analysis.

کلیدواژه‌ها English

tall building
Outrigger and Belt Truss
Seismic behavior
Incrimental Daynamic Analysis
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مهندسی عمران مدرس
دوره 17، شماره 4
مهر و آبان 1396
صفحه 1-13