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ممكن واحد يشرح لي الدرس بالعربية

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    faltomalto
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    ممكن واحد يشرح لي الدرس بالعربية

    Numbering of Joints

    The displacement method requires that all joints be numbered. Any numbering scheme can be chosen. Internal hinges are not considered as joints and are not numbered.

    Member End Moments

    We define member end moment Mik as the moment at joint i in the member i-k. The first subscript denotes the joint under consideration, the pair of subscripts denotes the member under consideration. For example, M23 would be the moment at the top of the left column in the frame shown above, i.e., the moment at joint 2 in member 2-3. The moments at the ends of member 2-3 are therefore called M23 (at the top of the member) and M32 (at the bottom of the member).
    The sign convention for member end moments Mik is counter-clockwise positive when the free body under consideration is a member. This is illustrated in the following figure:

    Joint moments


    As shown in the preceding figure, joint moments are defined on a free body consisting only of a given joint. They originate from:
    1. The member end moments. In this case, they are applied equal and opposite across the cut that separates a given member from the joint in question. With respect to the joint, therefore, these moments are taken to be positive in the clockwise direction.
    2. External application. A moment applied externally as a load to joint i is called Mi. This type of moment is considered positive in the counterclockwise direction. This type of moment often occurs when the given structure contains a cantilever member. It is convenient to calculate the cantilever moment, remove the cantilever, and apply the moment as an external load at the joint opposite the free end of the cantilever, as shown in the following figure:

    At joint 4, the true direction of the moment created by load Q is clockwise. It is therefore applied as a negative quantity in the counterclockwise positive convention.
    Joint Rotations

    Two types of rotation angles are considered. The angle of joint rotation, fi, is the angle by which joint i rotates relative to the undeformed structure, assuming that there is no translational displacement of any of the joints in the structure. Joint rotation is defined as counter-clockwise positive. Positive joint rotations fi and fk are shown in the following figure.

    Member Rotations

    The angle of member rotation, yik, is created by translational displacements of joints i and k in member i-k, assuming joint rotation is zero at both ends of the member. It is defined as the angle at joint i between the line segment joining the displaced positions of joints i and k and member i-k in the undeformed structure. It follows that yik = yki. Member rotation is defined as counter-clockwise positive. Positive member rotations yik and yki are shown in the following figure.



    رابط الدرس
    http://www.ecf.utoronto.ca/apsc/cour...finitions.html

  2. [2]
    شهاب الحق
    شهاب الحق غير متواجد حالياً
    عضو فعال
    الصورة الرمزية شهاب الحق


    تاريخ التسجيل: Aug 2006
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    السلام عليكم ورحمة الله وبركاته
    الاخ الكريم
    من غير لا تطلب من احد يشرح الدرس عليك وعلى جوجل ترجمة واطبع عنوان الموقع او انسخ الكلام اللى مش فاهمه هاتلاقى نتيجة جيدة باذن الله .
    وان لم تصل لنتيجة مرضية اخبرنا لعل احد الاخوة الاحباب يدلو بدلوه

    والله المستعان

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  3. [3]
    amel2009
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    جديد


    تاريخ التسجيل: May 2009
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    السلام عليكم

    اخبرنا ان لم تكن ترجمته بعد
    ان شاء الله يمكننا مساعدتك بالترجمه كامله

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  4. [4]
    faltomalto
    faltomalto غير متواجد حالياً
    عضو فعال


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    صراحة انا لم افهم الدرس بالنجليزية ممكن واحد يشرحلي الدرس بالعربية او يعطيني موقع للدرس بالعربية

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