راستی آزمایی روابط مشخصات مکانیکی آیین نامه های معتبر موجود برای بتن سبک سازه ای

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد زلزله، گروه مهندسی عمران، دانشگاه شهاب دانش.

2 استادیار، گروه مهندسی عمران، دانشگاه شهاب دانش.

3 دانشجوی کارشناسی ارشد سازه، گروه مهندسی عمران، دانشگاه شهاب دانش قم.

چکیده

سبک‌سازی یکی از مباحث نوین در صنعت ساختمان است که روز به روز در حال گسترش می‌باشد. این فن‌آوری، منجر به کاهش وزن تمام شده ساختمان با استفاده از تکنیک‌های نوین ساخت مصالح جدید و صرفه‌جویی در زمان می‌شود؛ همچنین با توجه با لرزه‌خیزی ایران و لزوم سبک‌سازی در سازه‌ها، این بحث از اهمیت ویژه‌ای برخوردار می‌باشد. این مقاله، مشخصات مکانیکی بتن سبک ‌سازه‌ای شامل مقاومت فشاری، مقاومت کششی، مقاومت خمشی و مدول الاستیسته را مورد بررسی قرار داده است. افزون بر این، با جمع‌آوری داده‌های مطالعات گذشته، با ایجاد بانک داده‌ها برای بتن سبک، نتایج آن را با روابط آیین‌نامه‌های معتبر دنیا (آمریکا، اروپا، استرالیا، کانادا و ژاپن) و روابط پیشنهاد شده توسط محققین دیگر برای بتن معمولی مقایسه کرده است. نتایج این مقایسه نشان می‌دهد که بتن سبک در محدوده مقاومت‌های فشاری رایج دارای مقاومت کششی، مقاومت خمشی و مدول الاستیسیته کمتری نسبت به بتن معمولی می‌باشد. همچنین براساس تحلیل‌های آماری و رگرسیون غیرخطی روابطی را برای مشخصات مکانیکی بتن سبک‌ سازه‌ای پیشنهاد داده است.

کلیدواژه‌ها


عنوان مقاله [English]

Verification of mechanical properties provisions of existing codes for lightweight concrete

نویسندگان [English]

  • Masoud Saadatkhosh 1
  • Mahdi Arezoumandi 2
  • Seyed Hadi Pour Hosseini 3
1 M.Sc. Student, Department of Civil Engineering, Shahab Danesh University.
2 Assistant Professor, Department of Civil Engineering, Shahab Danesh University.
3 M.Sc. Student, Department of Civil Engineering, Shahab Danesh University.
چکیده [English]

The demand for structural lightweight concrete (LWC) in many applications of modern construction is increasing. The use of lightweight aggregate concrete is beneficial in terms of reducing structural dead load, improving sound and thermal insulations, and ease of handling and transportation. A comprehensive literature review on mechanical properties of lightweight concrete including compressive strength, splitting tensile strength, modulus of elasticity and flexural strength is presented. In addition, databases are created for mechanical properties of lightweight concrete in order to lead to changes or acceptance in design codes and standards’ provisions. These data were compared with the American, European, Australian, Japanese and Canadian standards provisions. Results of this study show that existing code provisions are not always conservative for mechanical properties of lightweight concrete. Furthermore, statistical analysis (nonlinear regression) has been performed on the mechanical properties of lightweight concrete and new relationships have been suggested for the mechanical properties of lightweight concrete.

کلیدواژه‌ها [English]

  • Lightweight Concrete
  • Conventional Concrete
  • Tensile splitting strength
  • Modulus of elasticity
  • Flexural strength

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