تأثیر آزاد کردن اتصال ورق از ستون‌ها در دیوار برشی فولادی تحت بارگذاری‌های مختلف

حسین زاده, سید علی اصغر; کاظمی, علی; برخورداری, محمد علی; میرزایی, مهدی

doi:10.22065/jsce.2019.145512.1652

تأثیر آزاد کردن اتصال ورق از ستون‌ها در دیوار برشی فولادی تحت بارگذاری‌های مختلف

نوع مقاله : علمی - پژوهشی

نویسندگان

¹ دانشکده فنی و مهندسی، دانشگاه گلستان

² دانش آموخته کارشناس ارشد سازه

³ استاد دانشگاه علم و صنعت

⁴ رئیس گروه عمران دانشگاه امام علی (ع)

10.22065/jsce.2019.145512.1652

چکیده

در این تحقیق با استفاده از روش المان محدود، تأثیر آزاد کردن اتصال ورق از ستون‌ها در مشخصه‌های رفتار غیرخطی سیستم‌های دیوار برشی فولادی تحت بارگذاری‌های پو‌ش‌آور، سیکلی و انفجاری مطالعه شد. نتایج تحلیل‌های پوش‌آور نشان داد که در این سیستم، به دلیل عدم وقوع تسلیم کامل در سطح ورق، بطور نسبی از مقاومت ورق و در نتیجه مقاومت کل و تا حدی، سختی اولیه و شکل‌پذیری سیستم کاسته می‌شود، لیکن تغییری در مقاومت قاب به وجود نمی‌آید. با افزایش ضخامت ورق متناسب با کاهش نسبی مقاومت آن، نه تنها افت نسبی مقاومت سیستم نیمه‌پیوسته جبران می‌شود، بلکه سختی اولیه و شکل‌پذیری سیستم (با ضخامت اصلاح شده) نسبت به سیستم اولیه با اتصال کامل نیز افزایش می‌یابد. نتایج تحلیل سیکلی نشان داد که به دلیل کاهش نسبی مقاومت و جذب انرژی توسط ورق، میزان جذب انرژی در سیستم نیمه‌پیوسته نسبت به سیستم پیوسته نظیر کاهش می‌یابد. نتایج تحلیل‌های انفجاری نیز نشان داد که سیستم‌های پیوسته و نیمه‌پیوسته دیوار برشی فولادی (طراحی شده در برابر زلزله) در برابر بار انفجاری نیز تا حدی مقاوم هستند و به صورت کلی منهدم نمی‌شوند. همچنین، با جداسازی ورق پرکننده از ستون‌ها، رفتار سیستم‌های دیوار برشی فولادی تحت تأثیر نسبت طول دهانه به ارتفاع آن‌ها تغییر می‌کند.

کلیدواژه‌ها

موضوعات

مهندسی سازه و زلزله

عنوان مقاله [English]

Nonlinear behavior of steel plate shear wall connected to frame beams only under Various Loading conditions

نویسندگان [English]

Ali Asghar hosseinzade ¹
ali kazemi ²
Mohammad Ali Barkhordari ³
mehdi mirzaei ⁴

¹ Assistant Professor, Department of Civil Engineering, Golestan university

² M.SC. of Structural Engineering

³ Professor, Department of Civil Engineering, Iran University of Science and Technology

⁴ Instructor, Department of Engineering, Imam Ali University

چکیده [English]

In the present paper, the behavior of steel shear walls connected to frame beams only was investigated under various loading conditions (nonlinear static, cyclic and blast) using the finite element method and compared with that of the corresponding system with fully-connected infill walls (typical SPSW). The obtained results were discussed in terms of strength, initial stiffness, ductility, max of Von-Mises stress and max of in-plane and out-of-plane deformations. In the study, the effects of different system aspect ratios and various infill plate thicknesses were also considered. The adequacy of the finite element modeling approach for representing the responses of SPSWs under loading conditions was verified through comparison with experimental results. Results of pushover analyses showed that releasing of the infill wall connection to the columns limits the widespread yielding of the infill plate. This, in turn, affects the strength, initial stiffness and ductility of the system. Notably, the behavior of SPSW frames is not affected much by such configuration. Increasing the infill plate thickness in proportion to the decrease of its strength, not only offsets the effect of this configuration on the system strength, but also improves the system behavior in terms of initial stiffness and ductility (compared to the corresponding system with infill plate connected to boundary columns and beams). Results of cyclic analyses showed that the dissipated energy by the semi-connected SPSW is relatively decreased mainly due to the decrease of plate strength and energy absorption. Results of analyses under blast loading condition showed that both fully-connected and semi-connected SPSWs designed for seismic loading can partially resist against out-of-plane blast loading effects without failure.

کلیدواژه‌ها [English]

Steel Plate Shear Wall
Blast
Earthquake
Finite Element
Nonlinear analysis

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