تستخدم الإطارات البيتونية المقاومة للعزوم في الأبنية المنخفضة إلى متوسطة الارتفاع في المناطق الزلزالية استخداماً كبيراً.
تتصرف هذه الإطارات تصرفاً جيداً عندما تتعرض لحركات زلزالية قوية إذا كانت مصممة بحيث تبدد الطاقة الزلزالية المدخلة من خلال التشوهات في المجال اللدن، و من ثم تصبح الوصلات بين الجوائز و الأعمدة مكونات حرجة في أداء هذه المنشآت.
في الوصلات التقليدية للإطارات لا يتجاوز عرض الجائز عرض العمود المتصل معه، إلا أنه في كثير من الحالات توجد حاجة لاستخدام جوائز مخفية ذات عرض أكبر من عرض العمود نظراً إلى سهولة تركيب القالب و سرعته و تقليل الارتفاع الطابقي المطلوب. تستخدم الإطارات البيتونية المقاومة للعزوم الحاوية على جوائز مخفية بشكل واسع على الرغم من قلة المعلومات عن أدائها تحت تأثير الحمولات الزلزالية، الأمر الذي جعل غالبية كودات التصميم تقيد استخدام وصلات جائز مخفي_عمود في المناطق الزلزالية.
RC moment-resisting frames (RCMRFs) have commonly been used for low-to-moderate rise buildings in
seismic prone regions. RCMRFs can perform well when they are subjected to strong earthquake ground
motions if they are properly designed and detailed to dissipate the seismic input energy through
deformations in inelastic range. The connections between beams and columns thus become critical
components to the performance of these structures.
In conventional RCMRF connections, the width of the beam does not exceed the width of the column.
Adopting a flat beam system for the design scheme provides many advantages, such as the reducing the
amount of formwork required, the simplicity for repetition, and the decrease of the required story height.
RCMRFs with flat beams have been used extensively, despite the lack of sufficient information on how
this system behaves under earthquake loading which leads the codes to restrict the use of flat beamcolumn
connections in earthquake prone regions.
References used
Committee for the development of seismic codes. Norma de Construcción Sismor resistente NCSE-94. Madrid: Spanish Ministry of Construction; 1994
Darwin D, Nmai CK. “Energy dissipation in RC beams under cyclic load” . J Struct Eng 1986;112(8):1829.46
DIANA, 2007, User Manual-DIANA Version 9.3, DIANA Analysis, P.O. Box 113, 2600 AC Delft, The Netherlands
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