تاثیر تسلیح ملات بر عملکرد دیوارهای خشتی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده عمران، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران

چکیده

با توجه به سالنامه اماری درصد قابل توجهی از ساختمان‌های مسکونی در ایران مربوط به ساختمان‌های خشتی و سنتی می‌باشد. این ساختمان‌های کوتاه مرتبه به علت داشتن سیستم سازه‌ای سنتی قادر به تحمل بارهای جانبی ناشی از زلزله نیستند. در این مقاله راهکارهایی برای افزایش عملکرد این ساختمان‌ها در برابر زلزله ارائه شده است. بدین منظور تعداد 12 عدد دیوار خشتی با انواع مختلف ملات: معمولی، مسلح شده با توری فلزی (با قطر چشمه 7/12 و 05/19 میلی‌متر(5/0 و 75/0 اینچ))، توری پلی‌مری (با قطر چشمه 10 و 25 میلی‌متر) و لیف خرما، در ابعاد 22×120×120 سانتی‌متر برای بررسی رفتار دیوار و ملات ساخته شده‌اند. دیوارها تحت بار جانبی یکنوا بارگذاری شده تا نوع ترک‌ها، نیروی نهایی، تغییرشکل نهایی و جذب انرژی آنها بدست آیند. نتایج‌ حاصل از آزمایش نشان می‌دهد که ملات به عنوان یکی از ضعیف‌ترین اجزای دیوار می‌باشد. در دیوارهای مسلح شده با توری پلی‌مری با قطر چشمه 25 میلی‌متر افزایش 83 درصدی در بار نهایی و افزایش 165 درصدی در جذب انرژی مشاهده شده است. در دیوارهای مسلح شده با لیف‌خرما افزایش 82 درصدی تغییر مکان نهایی و افزایش 162 درصدی در جذب انرژی مشاهده شده است. بنابراین می‌توان با تقویت ملات با توری و لیف خرما عملکرد دیوار را بهبود بخشید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effect of reinforcement the mortar on adobe walls performance

نویسندگان [English]

  • A. Vatani Oskouei
  • M. Afzali
  • M. Madadipour
Department of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
چکیده [English]

Present study investigates an experimental performance of mud brick wall under static lateral
load. The size of bricks was about 22×22×7 cm3 (face × bed × end). For wall specimens, two types mortar
was used: a) non-reinforced mortar, b) reinforcement mortar. For reinforcement mortar many types such as:
metal mesh (mesh size: 0.5 and 0.75 inches), polymeric mesh (mesh size: 10 and 25 mm) and palm fiber
considered was used. First mechanical properties of each types of mortar have been determined. Then the 12
wall with dimensions of 120 × 120 × 22 cm3 are made with six different kinds of mortar. Walls are loaded
under static lateral load in order to evaluate their cracks pattern, load capacities, deformability and energy
absorption characteristics. Cracks in the specimens occurred between the first and the second row that caused
the failure. The mortar was vulnerable part of conventional walls (unreinforced mortar). Ultimate strength
of walls with mortar reinforced by polymer mesh (mesh size was 25 × 25 mm) increased the load and
energy capacity to 83.04% and 158% respectively. The palm fibers increased the load carrying capacity about
82.14% and energy absorption capacity about 247%. Test result was shown that using palm fiber and polymer
mesh with diameter of 25 mm in mortar can increase adobe wall performance.

کلیدواژه‌ها [English]

  • Mud brick
  • Static lateral load tests
  • Palm fiber
  • Mortar
  • Mud brick wall
  • Metal mesh
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