توسعه روش نوین محاسباتی بر اساس المانهای خرپایی جهت بررسی رفتار استاتیکی غیرخطی دیوارهای برشی فولادی

نوع مقاله : علمی - پژوهشی

نویسندگان

1 دانشجوی دکتری مهندسی سازه، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران

2 استادیار، گروه مهندسی عمران، واحد کرمانشاه، دانشگاه آزاد اسلامی، کرمانشاه، ایران

3 استادیار، گروه عمران، دانشکده مهندسی عمران، واحد اسلام آباد غرب، دانشگاه آزاد اسلامی، اسلام آباد غرب، ایران

چکیده

بررسی رفتار غیرخطی دیوارهای برشی فولادی تحت بارهای جانبی ملزم به انجام مدلسازیهای پییچیده در حیطه تغییرشکلهای فراارتجاعی میباشد. این مدلسازیها به دلیل نیاز به زمان زیاد مدلسازی و تحلیل، نیاز به داشتن دانش تخصصی در زمینه روابط اجزا محدود و همچنین حساسیت خروجیهای تحلیل نسبت به مشخصات مصالح و ابعاد سازه، امکان استفاده عموم مهندسین را فراهم نخواهد کرد. از طرف دیگر، به دلیل حجم بالای محاسبات، امکان مدلسازی سازه‌های تمام مقیاس را به آسانی فراهم نمیکند. بنابراین در این تحقیق رویکردی نوین بر پایه به کارگیری اعضای محوری به منظور ارزیابی پاسخ غیرخطی دیوارهای برشی فولادی ارائه گردید. نوآوری روش پیشنهادی در این است که موانع موجود در مدلسازی دیوارهای برشی با شکلها و نسبتهای ابعادی مختلف بر طرف شده و به دلیل سرعت محاسباتی بالای این روش (صرفه‌جویی 60 % در زمان پیش‌پردازش، 92 %در زمان تحلیل در بارگذاری استاتیکی و 66 %در بارگذاری چرخه‌ای)، سازه‌های تمام مقیاس با سرعت بالا و دقت قابل قبول تحلیل میشوند. بعلاوه، این روش به دلیل جامعیت، امکان قرارگیری در نرم‌افزارهای تجاری موجود را داشته و یا میتوان نرم‌افزاری مبتنی بر این رویکرد نوین توسعه داد. به منظور ارزیابی کارایی روش پیشنهادی، 4 دیوار مختلف برشی با مشخصات مکانیکی و هندسی متفاوت با استفاده از روش پیشنهادی مدلسازی و تحلیل شد. نتایج حاکی از تطابق مناسب بین خروجیهای روش پیشنهادی و رفتار واقعی دیوار برشی فولادی داشت که نشان دهنده صحت عملکرد این روش میباشد. نتایج تحلیل عددی با استفاده از روش پیشنهادی نشان داد که به ازای نسبت ابعاد کم و ضخامتهای کم دیوار برشی، نسبت تنش برشی بیشینه مقدار خود را دارد. بعلاوه، افزایش ضخامت ورق میانی و همچنین افزایش H/L موجب افزایش برش قابل تحمل توسط مقطع و کاهش نسبت تنش میگردد. این کاهش به طور متوسط برای ضخامت 8/61 درصد و برای H/L حدود 72 درصد میباشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Development of a new computational method based on truss elements to investigate the nonlinear static behavior of steel shear walls

نویسندگان [English]

  • Babak Moradnezhad 1
  • Mohsen Oghabi 2
  • Mehrzad TahamouliRoudsari 2
  • Mehrdad Movahednia 3
1 Ph.D. candidate, dept. of Civil engineering, Kermanshah branch, Islamic Azad University, Kermanshah, Iran
2 Assistant Professor, dept. civil engineering, Islamic Azad University, Kermanshah, Iran
3 Assistant professor, dept. of civil engineering, Eslamabad-E-Gharb Branch, Islamic Azad University, Eslamabad-E-Gharb,Iran.
چکیده [English]

Investigation of the nonlinear behavior of SPSWs requires complex non-linear finite element analyses. These analyses have some drawbacks namely convergence problems, time-consuming, and the need for expertise. Therefore, it is necessary to propose a comprehensive method that can solve the problems of current methods. In this research, a novel approach based on the use of axial members to evaluate the nonlinear behavior of SPSWs with any arbitrary configuration is developed. The innovation of the proposed method is that the obstacles in modeling of shear walls with different shapes and aspect ratios have been solved. Moreover, due to the low computational cost of this method, i.e., a 60% reduction in modeling time, and a saving of 92% and 66% in analysis time in static and cyclic loading, respectively, full-scale structures can be analyzed with acceptable accuracy. In addition, owing to its comprehensiveness, this method can be placed in existing commercial software, or it is possible to be developed as software. To evaluate the efficiency of the proposed method, 4 different SPSWs with different mechanical and geometric characteristics were analyzed using the proposed method. The results showed a good agreement between the outputs of the proposed method and the actual behavior of the SPSW, which verifies the suitable performance of the method. The results of analysis using the proposed method indicated that the maximum shear stress ratio occurs at the lower H/L and thickness. In addition, increasing the thickness and H/L of the infill results in an increase in the shear that can be tolerated by the section as well as a reduction in the stress ratio. The average of reduction for an increase in thickness and H/L is 61.8% and 72 %, respectively.

کلیدواژه‌ها [English]

  • Steel plate shear walls
  • Equivalent truss method
  • Full-scale analysis
  • Load bearing capacity
  • Initial stiffness

مراجع

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  • تاریخ دریافت: 04 خرداد 1401
  • تاریخ بازنگری: 24 مهر 1401
  • تاریخ پذیرش: 05 آبان 1401

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