بررسی پاسخ ساختمان‌های فولادی مجهز به مهاربندهای کمانش ناپذیر در برابر خرابی پیشرونده

محمدی, یعقوب; باقری پوراصیل, میثم

doi:10.22065/jsce.2019.153064.1688

بررسی پاسخ ساختمان‌های فولادی مجهز به مهاربندهای کمانش ناپذیر در برابر خرابی پیشرونده

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ دانشیار گروه مهندسی عمران، دانشگاه محقق اردبیلی، اردبیل، ایران

² کارشناس ارشد مهندسی سازه، دانشگاه محقق اردبیلی، اردبیل، ایران

10.22065/jsce.2019.153064.1688

چکیده

در مطالعه حاضر استفاده از مهاربندهای کمانش ناپذیر که به دلیل جلوگیری از کمانش مهاربند،‌ ‌قابلیت جذب انرژی بسیار بیشتری را نسبت به سیستم های رایج مهاربندی همگرا فراهم می آورند، به عنوان نوآوری تحقیق با هدفِ کاهش پتانسیل خرابی پیشرونده در قاب‌های فولادی مهاربندی شده مورد ارزیابی قرار گرفته است. برای این منظور مدل اجزاء محدود سه بعدی ساختمان‌های 4، 8 و 12 طبقه در دو حالت استفاده از مهاربندهای معمولی و کمانش ناپذیر شبیه سازی شدند و پاسخ آنها در برابر خرابی پیشرونده مورد ارزیابی قرار گرفته است. بررسی خرابی پیشرونده با استفاده از روش مسیر بار جایگزین صورت پذیرفت و پاسخ سازه ها در برابر حذف ستون مورد بررسی قرار گرفت. شبیه‌سازی مدل‌ها با استفاده از نرم افزار ABAQUS انجام شد. همچنین صحت روش اجزاء محدود مورد استفاده در شبیه سازی مدل‌‌های مورد بررسی ارزیابی شد و تطابق مناسبی بین نتایج حاصل مشاهده گردید. مهم ترین نتایج حاصل نشان می دهد که قاب های فولادی که دارای مهاربندهای کمانش ناپذیر می باشند، در مقایسه با قاب های فولادی دارای مهاربندهای معمولی متحمل تنش های کمتری شده اند؛ بطوریکه در تمامی حالت ها، مهاربندهای کمانش ناپذیر با جذب انرژی ورودی سازه، سبب شده اند که تنش های کمتری به سایر اعضای سازه وارد شود و بدین ترتیب پتانسیل وقوع خرابی پیشرونده کاهش یابد. همچنین استفاده از مهاربند کمانش ناپذیر سبب شده است که دوران محل اتصال تیر به ستون در مقایسه با ساختمان‌های با مهاربند معمولی کاهش یابد. این اثرگذاری بویژه در ساختمان‌های با ارتفاع بیشتر مشهودتر می‌باشد؛ بطوریکه مقدار بیشینه چرخش مفصل متناظر با ساختمان 12 طبقه دارای مهاربند کمانش ناپذیر در مقایسه با مهاربند معمولی به میزان 21 درصد کاهش یافته است.

کلیدواژه‌ها

موضوعات

خرابی پیشرونده

عنوان مقاله [English]

Investigation of steel buildings response equipped with buckling-restrained braces against progressive collapse

نویسندگان [English]

Yaghoub Mohammadi ¹
Meysam Bagheripourasil ²

¹ Ph.D., Civil Engineering Department, University of Mohaghegh Ardabili, Ardabil, Iran,

² M.Sc., Civil Engineering Department, University of Mohaghegh Ardabili, Ardabil, Iran

چکیده [English]

In the present study, the use of buckling-restrained braces (BRBs) has been evaluated as a research innovation aimed at reducing the potential of progressive collapse in steel braced frames. These braces prevent the overall buckling of brace and provide much more energy absorption than conventional convertible bracing systems. For this purpose, three-dimensional finite element models of 4, 8, and 12-story buildings were simulated in two modes using ordinary and buckling braces and their response against progressive collapse was evaluated. The progressive collapse analysis was carried out using an alternative load path method and the response of the structures to column removal was investigated. Simulation of models was done using ABAQUS software. Also, the accuracy of the finite element method used in simulating the models was evaluated and a suitable agreement between the results was observed. The most significant results show that in steel frames that have BRBs, less stresses have been created compared with conventional steel braces. In all cases, BRBs with internal energy absorption of the structure have caused lower stresses to other structure member, thereby reducing the potential of progressive collapse. Also, the use of BRBs has reduced the rotation of the beam to column connection, compared to conventional bracing. This effect is especially noticeable in buildings with higher altitudes; the maximum amount of joint rotation corresponding to the 12-story building with BRBs has been reduced by 21% compared with the conventional braces. The reason for this is that, in buckling-restrained braces, the members are able to withstand a pressure above the tensile yield strength, and, unlike ordinary systems, the inherent ductility is due to the occurrence of yield in pressure before it begins to buckle.

کلیدواژه‌ها [English]

Progressive collapse
Buckling-restrained brace
Finite element method
Alternate load path method
BRB

مراجع

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