books effective length
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effective span (Info)
effective span:- المسافة بين مراكز مساند الجائز. يستخدم هذا الطول، وهو أكبر من المجاز الحر (المسافة الأفقية بين مسندين)، في حساب عزم الانعطاف الذي يتعرض له الجائز (المعجم الموحد لمصطلحات الهندسة المدنية)
