مهندسی سازه و ساخت

مهندسی سازه و ساخت

تاثیر لحاظ اثرات ثانویه بر رفتار چرخه‌ای تیرهای فولادی با جان کاهش یافته

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران
2 دانشیار، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل، ایران
چکیده
استفاده از بازشو در جان تیرهای فولادی به عنوان روشی جدید برای بهبود عملکرد لرزه ای قاب های خمشی فولادی مطرح می باشد. طول محدود ناحیه دارای بازشو در این تیرها و بروز مکانیزم ویراندیل در آنها، باعث کاهش طول افقی تیر در محدوده رفتار غیرارتجاعی می شود. در این میان، صلبیت کف سازه ای از کاهش طول دهانه قاب جلوگیری می کند. این مسئله باعث ایجاد نیروهای کششی در طول تیر می شود که به اثرات ثانویه مشهور است. مقاله حاضر تاثیر لحاظ اثرات ثانویه بر رفتار چرخه ای تیرهای فولادی با جان کاهش یافته را به روش المان محدود بررسی می نماید. برای این منظور ابتدا یک مدل المان محدود از تیر دارای بازشو در جان در نرم افزار آباکوس توسعه داده شده و برای اطمینان از صحت نتایج، داده های عددی با استفاده از گزارشات آزمایشگاهی صحت سنجی شده اند. در ادامه با در نظر گرفتن سه پروفیل مختلف برای مقطع تیر و ابعاد مختلف برای بازشو، مدل های عددی یکبار بدون لحاظ اثرات ثانویه و بار دیگر با لحاظ این اثرات تحلیل شده و نتایج با هم مقایسه شده اند. بر اساس نتایج بدست آمده، لحاظ اثرات ثانویه باعث تغییر رفتار تیر در ناحیه کاهش یافته و جلوگیری از افت سختی و مقاومت در شاخه نزولی نمودار می شود. مقدار اضافه مقاومت ناشی از لحاظ اثرات ثانویه در دریفت های پایین تر از 2% ناچیز بوده، لیکن با افزایش دامنه بارگذاری بیشتر می شود. تحت دریفت بارگذاری 6%، مقدار این اضافه مقاومت بین 44% تا 120%، بسته به ابعاد بازشو متغیر می باشد. تعیین مقدار این اضافه مقاومت به عنوان تابعی از دریفت بارگذاری و ابعاد مختلف بازشو برای استفاده در روند تحلیل و طراحی تیرهای با جان کاهش یافته را می توان به عنوان نوآوری اصلی این تحقیق برشمرد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigating the influence of second order effects on the cyclic behavior of steel perforated beams

نویسندگان English

Morteza Daryaei 1
Vahid Akrami 2
1 M.Sc. student, Faculty of engineering, University of Mohaghegh Ardabili, Ardabil, Iran
2 Associate professor, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
چکیده English

Implementation of openings in beams web has been introduced as an innovative method for improving seismic performance of steel moment frames. The limited length of the opening zone and formation of the Vierendeel mechanism in this area causes the reduction of beam horizontal length in nonlinear behavior range. This is while, the rigidity of the structural floor system prevents the reduction of the beam span length. This causes the creation of tensile force in the beam which is known as the second order effect. In this article a numerical study is conducted to evaluate the influence of the second order effects on the cyclic behavior of steel beams with web opening. For this purpose, a perforated steel beam has been modeled in Abaqus software and its results has been validated using laboratory test data. The numerical models have been analyzed considering different opening dimensions and three different profiles for the beam cross-section. This is done once with and once again without considering the second order effects and the results are compared. Based on the results, considering the second order effects changes the behavior of the beam in the reduced area and prevents the stiffness and strength decrease in the post-capping part of the hysteresis curve. The amount of additional strength caused by second order effects is negligible for drift ratios smaller than 2%, but it increases with the increase of loading amplitude. At 6% drift ratio, the amount of this additional strength varies between 44% and 120%, depending on the dimensions of the opening. Determination of this additional strength as a function of lateral drift ratio and opening dimensions for use in the analysis and design of beams with web openings can be considered as the main innovation of this research.

کلیدواژه‌ها English

Steel beam
Web opening
Second order effect
Finite element method
Cyclic loading
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  • تاریخ دریافت 14 مهر 1402
  • تاریخ بازنگری 01 اسفند 1402
  • تاریخ پذیرش 30 فروردین 1403