بررسی آزمایشگاهی و عددی رفتار خمشی تیرهای ساندویچی با رویه‌های فولادی و هسته الاستومری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد، دانشکده عمران و محیط زیست، دانشگاه امیرکبیر، تهران، ایران

2 عضو هیأت‌علمی، کارشناسی ارشد، دانشکده فنی و مهندسی شهید باهنر شیراز، شیراز، ایران‎ ‎

چکیده

صفحات ساندویچی روزبه‌روز در حال تکامل بوده و مدل‌‏های جدید ساخته ‌شده نسبت به مدل‌‏های قبلی دارای مقاومت و باربری ‏بیشتری هستند و به دلیل نسبت استحکام به وزن و جذب انرژی زیاد، کاربرد وسیعی در صنایع مختلف از جمله هوافضا، صنایع دریایی و ‏پل‌سازی دارند. اما مشکلی که در بیشتر این نوع صفحات وجود دارد، خردشدن هسته در اثر اعمال بارگذاری و در نتیجه تخریب ‏تیر است. در تحقیق حاضر، کارکرد تحمل بار و مقاومت نهایی در نوع جدیدی از تیر‏های ساندویچی با رویه‌های فولادی و هستۀ ‏فوم‏ الاستومری مورد بررسی عددی و آزمایشگاهی قرار گرفته که استفاده از این نوع هسته در ‏تیر‏های ساندویچی در تحقیقات قبلی ‏گزارش نشده است.‏ فوم‌های الاستومری دارای مدول الاستیسیته کمتری هستند، اما در تغییرشکل‌های بزرگ رفتار برگشت‌پذیر دارند. از این‌رو در مورد سازه‌هایی از جمله پل که برای جذب انرژی بالا بکار می‌روند می‌توانند مورد استفاده قرار گیرند. در این مقاله، با ساخت پانل‌های ساندویچی، علاوه بر تعیین مشخصات مکانیکی مصالح، تأثیر اضافه کردن هستۀ الاستومری در مقدار تغییرشکل تیر ساندویچی و میزان جذب انرژی آن، مورد مطالعه قرار گرفته است. همچنین شبیه‌سازی ‏سازۀ ساندویچی و صفحات فولادی تحت بار خمش سه‌نقطه به کمک نرم‌افزار آباکوس انجام ‌شده است. بررسی‌های تجربی و مطالعات ‏پارامتریک انجام ‌شده نشان می‌دهند که بین نتایج عددی و تجربی، تطابق خوبی وجود دارد و می‌توان در تحقیقات آتی، در ابعاد بزرگ‌تر به عنوان عرشه پل مورد بررسی قرار گیرد. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Experimental and Numerical Study of Bending Behavior of Sandwich Beams with Steel Surfaces and Elastomeric Core

نویسندگان [English]

  • Alireza Golshan 1
  • Mahmoudreza Golshan 2
1 Master of Science, Civil and Environmental Engineering Department, Amirkabir University of Technology, ‎Tehran, Iran‎
2 Instructor, Master of Science, Shahid Bahonar Technical and Engineering College, Shiraz, Iran ‎
چکیده [English]

Sandwich plate manufacturing technology is evolving day by day and it has led to the higher strength ‎and load-bearing capacity of new fabricated models in comparison to previous models. Due to ‎their high ratio of strength to weight and great energy absorption characteristic, they are widely used in various ‎industries including aerospace, marine, and bridge construction. However, the problem with most of these types of ‎plates is that the core crushes due to loading and thus leads to beam failure. In the present study, the load-bearing ‎capacity and ultimate strength of a novel type of sandwich beam with steel faces and elastomeric foam core are numerically and experimentally investigated. The use of this type of core in sandwich beams has not been ‎reported in previous research. Although elastomeric foams have a lower modulus of elasticity, they show reversible ‎behavior in large deformations, and therefore they can be used in structures such as bridges, where high absorption ‎of energy is expected. In this paper, by fabricating sandwich panels, in addition to determining the mechanical ‎properties of materials, the effect of adding elastomeric core on the deformation of the sandwich beam and its ‎energy absorption was studied; Furthermore, the simulation of sandwich structure and steel plates under three-point bending load was done with the help of Abacus software. Experimental and parametric studies showed ‎that ‎there ‎is good compliance between experimental investigations and numerical results. Thus, it can be considered ‎as a bridge deck in larger dimensions in future studies.  ‎

کلیدواژه‌ها [English]

  • Sandwich structure
  • Three-point bending load
  • Elastomeric core
  • Steel surface
  • bridge building
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