بررسی آزمایشگاهی رفتار دیوارهای مرکب تحت بارگذاری عمود بر صفحه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 ------استاد تمام دانشکده مهندسی عمران دانشگاه صنعتی خواجه نصیرالدین طوسی--------

2 دانشجوی دکتری، دانشکده مهندسی عمران دانشگاه صنعتی خواجه نصیرالدین طوسی

3 دانشجوی دکتری، پلی تکنیک، ژیرونا، ژیرونا، اسپانیا

چکیده

استفاده از دیوارهای حائل در سازه‌های دارای گودبرداری عمیق امری ضروری می‌باشد. امروزه از سیستم دیوارهای بتن‌آرمه به عنوان سیستم مرسوم برای ساخت دیوارهای حائل استفاده می‌شود. این نوع دیوارها علی‌رغم مزایای مناسب‌شان، مشکلات و چالش‌های اجرایی مهمی دارند که از آن جمله می‌توان به قالب‌گذاری جهت بتن‌ریزی، گماردن شبکه‌های آرماتوری با تراکم بالا، سرعت پایین ساخت و درگیر شدن تعداد زیادی نیروی کار اشاره نمود. در این مطالعه جهت رفع مشکلات اجرایی دیوارهای بتن‌آرمه، سیستم دیوار مرکب جهت بکارگیری به عنوان دیوار حائل مطرح می‌گردد. در این دیوارها که از یک ورق کششی، برش‌گیر، بتن و شبکه آرماتور حرارتی تشکیل می‌شود، ورق هم نقش قالب و هم نقش آرماتور کششی را ایفا نموده و بدین ترتیب سرعت و سهولت اجرای ساخت دیوار افزایش می‌یابد. در این تحقیق با استفاده از 6 نمونه آزمایشگاهی به بررسی کامل این دیوارها تحت بار عمود بر صفحه پرداخته شده و اثر پارامترهای مختلف نظیر طول برش‌گیر، فاصله برش‌گیر، مقاومت بتن، استفاده از ورق فشاری و استفاده از آرماتور فشاری بر رفتار دیوارها بررسی شده است. از نتایج به دست آمده مشخص گردید که در صورت طراحی مناسب، دیوارهای مرکب تحت بار عمود بر صفحه، رفتار بسیار مناسب و شکل‌پذیر از خود بروز می‌دهند. همچنین مشاهده گردید حتی در صورت وجود نقایصی در سیستم دیوار مرکب، نظیر فاصله بسیار زیاد برش‌گیرها و طول کم برش‌گیرها، این دیوارها توانایی ایجاد رفتار نیمه‌شکل‌پذیر را دارا هستند. در انتها مقایسه‌ای بین نتایج حاصل از آزمایشات با نتایج حاصل از آیین‌نامه ACI 318-05 انجام شد. این مقایسه نشان داد که آیین‌نامه ACI ظرفیت‌ دیوار مرکب را به صورت محافظه‌کارانه تخمین می‌زند.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental Investigation of Composite (Steel-Concrete) Walls under Pure Out-of-plane Load

نویسندگان [English]

  • Saeid Sabouri-Ghomi 1
  • Arman Nasri 2
  • Younes Jahani 3
1 Professor / Civil Engineering Department / K.N Toosi University of Technology / Tehran , Iran
2 Civil Engineering Department, K.N. Toosi University of Technology, Tehran, Iran
3 Analysis and Advanced Materials for Structural Design (AMADE), Polytechnic School, University of Girona
چکیده [English]

This paper presents a new structural system for retaining walls. In civil works, in general, there is a trend to use the traditional reinforced concrete (RC) retaining walls to resist soil pressure. Despite their good resistance, RC retaining walls have some disadvantages such as the need for huge temporary formworks, high dense reinforcing, low construction speed, etc. In the present work, a composite wall with only one steel plate (steel-concrete) was proposed to cover the disadvantages of the RC walls. In this system, a steel plate was utilized not only as tensile reinforcement but also as permanent formwork for the concrete. To evaluate the efficiency of the proposed SC composite system, an experimental program that included six specimens was performed. In this experimental campaign, effects of different parameters such as length of shear connectors, use of compressive steel plate, concrete ultimate strength, the distance between shear connectors, and compressive steel reinforcement were investigated. The results showed that with proper design, the composite walls have very good and ductile behavior under out-of-plane loads. Furthermore, it was observed that even with a large distance between the shear connectors, a short length of the shear connectors, etc., this system is capable to keep the flexural performance and shows semi-ductile behavior. Furthermore, the design equations based on the ACI code for calculating out-of-plate flexural and shear strength of SC composite walls were presented and compared to the experimental database.

کلیدواژه‌ها [English]

  • Composite wall system
  • Retaining wall
  • Experimental test
  • Flexural load
  • Out-of-plane load

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نشریه مهندسی عمران امیرکبیر
دوره 53، شماره 7
مهر 1400
صفحه 3129-3148

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