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ETABS related question

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  1. [1]
    ahm531
    ahm531 غير متواجد حالياً

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    ETABS related question

    Al Salamo Alekom
    Sorry for typing in english but that is because my computer containes no arabic letters.

    I have a question regarding ETABS, and looking forward to get some answers from the experts in this forum.

    I'm working on my graduation project which is the design of high rise structure, and I decided to model and Analyse it using ETABS 8.00.

    My question is, when I enter the beams and Columns elements, There is a filed to select the moment releases where I have to select between Pinned or Continuous? How does this selection affect the analysis and design results, and what is the difference between this option, and the option of assigning Joints restrained from the menu "Assign"?

  2. [2]
    Eng. Haytham
    Eng. Haytham غير متواجد حالياً
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    moment release

    in beams, it's usually connected as moment continouse
    because this is the normal beam analysis, to be designed as continouse beam,


    so in beams use moment

    in columns, it has another story, because it depends on the structural system that you use in your highrise building.

    in most cases, they let the columns to be pinned and designed for axial loads only,

    for more details about this topic, wait for my articla in this forum about all these type connection

    Haytham Sadeq
    Civil engineering senior student
    Qatar University

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  3. [3]
    Abo Fares
    Abo Fares غير متواجد حالياً
    مشرف


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    اقتباس المشاركة الأصلية كتبت بواسطة Eng. Haytham مشاهدة المشاركة
    in beams, it's usually connected as moment continouse
    because this is the normal beam analysis, to be designed as continouse beam,


    so in beams use moment

    in columns, it has another story, because it depends on the structural system that you use in your highrise building.

    in most cases, they let the columns to be pinned and designed for axial loads only,

    for more details about this topic, wait for my articla in this forum about all these type connection

    Haytham Sadeq
    Civil engineering senior student
    Qatar University
    السلام عليكم..

    في الأحوال العادية (في الدراسة اليدوية على الأحمال الشاقولية) فإننا نصمم الأعمدة على الضغط المركزي آخذين بعين الاعتبار معاملات تصعيد للحمولة المطبقة للحظ أثر اللامركزية الطارئة حسب موقع العمواد في المبنى..
    ولكن في النمذجة على الإيتابس التي هي هدف لدراسة تحمل المبنى تحت تأثير الأحمال الزلزالية، فالتصميم يجب أن يكون على العزوم المطبقة أيضاً.. فكيف لنا أن نصمم العمود على أساس أنه pinned؟؟

    أما عن السؤال الأصلي، الفرق بين pinned و continuous هو ببساطة طبيعة الاستناد، بسيط أو مستمر..

    مع تحيـــــــاتي..

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  4. [4]
    Eng. Haytham
    Eng. Haytham غير متواجد حالياً
    عضو


    تاريخ التسجيل: Apr 2007
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    اقتباس المشاركة الأصلية كتبت بواسطة أبو الحلول مشاهدة المشاركة

    السلام عليكم..

    في الأحوال العادية (في الدراسة اليدوية على الأحمال الشاقولية) فإننا نصمم الأعمدة على الضغط المركزي آخذين بعين الاعتبار معاملات تصعيد للحمولة المطبقة للحظ أثر اللامركزية الطارئة حسب موقع العمواد في المبنى..
    ولكن في النمذجة على الإيتابس التي هي هدف لدراسة تحمل المبنى تحت تأثير الأحمال الزلزالية، فالتصميم يجب أن يكون على العزوم المطبقة أيضاً.. فكيف لنا أن نصمم العمود على أساس أنه pinned؟؟

    أما عن السؤال الأصلي، الفرق بين pinned و continuous هو ببساطة طبيعة الاستناد، بسيط أو مستمر..


    مع تحيـــــــاتي..
    I may didn't illustrate what I mean exactly,

    what I want to say, that the highrise buildings have more than one design system to be used and I will not go through them now

    but most of the towers and highrise buildings use the system that is designed to resisted the wind load and Seismic loads by the shear wall only,
    no latarel force is tranfered to the columns
    and this makes the floor system to resist the gravity floors only

    so if the designer want to use this structure system in the highrise building, he can really assume and model the columns to resist the axial load only with mimium moments in both direction
    by using pinned command in ETABS
    this type of floor - column connection can be named as non-rigid connections

    rigid connections is used in other cases and it has a very special detailing in construction to be able to tranfer moments


    Regards,

    Haytham Sadeq
    Senior student, Civil Engineering department
    Qatar University

    0 Not allowed!



  5. [5]
    فاطمةالمهاجرة
    فاطمةالمهاجرة غير متواجد حالياً

    إستشارية الهندسة المدنية


    الصورة الرمزية فاطمةالمهاجرة


    تاريخ التسجيل: Feb 2008
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    اقتباس المشاركة الأصلية كتبت بواسطة Eng. Haytham مشاهدة المشاركة
    I may didn't illustrate what I mean exactly,

    what I want to say, that the highrise buildings have more than one design system to be used and I will not go through them now

    but most of the towers and highrise buildings use the system that is designed to resisted the wind load and Seismic loads by the shear wall only,
    no latarel force is tranfered to the columns
    and this makes the floor system to resist the gravity floors only

    so if the designer want to use this structure system in the highrise building, he can really assume and model the columns to resist the axial load only with mimium moments in both direction
    by using pinned command in ETABS
    this type of floor - column connection can be named as non-rigid connections

    rigid connections is used in other cases and it has a very special detailing in construction to be able to tranfer moments


    Regards,

    Haytham Sadeq
    Senior student, Civil Engineering department
    Qatar University
    السلام عليكم هل تقصد بسؤالك انك تريد ان تحمل shear wall كل الاحمال الافقية ولن يبقى على الاعمدة الا بعض من الاحمال العمودية وستغير العقدة بين العمود و الكمرة من اهدا ما تقصده شكرا

    0 Not allowed!



  6. [6]
    Abo Fares
    Abo Fares غير متواجد حالياً
    مشرف


    تاريخ التسجيل: Mar 2008
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    اقتباس المشاركة الأصلية كتبت بواسطة eng. Haytham مشاهدة المشاركة
    i may didn't illustrate what i mean exactly,
    اقتباس المشاركة الأصلية كتبت بواسطة eng. Haytham مشاهدة المشاركة


    what i want to say, that the highrise buildings have more than one design system to be used and i will not go through them now

    but most of the towers and highrise buildings use the system that is designed to resisted the wind load and seismic loads by the shear wall only,
    no latarel force is tranfered to the columns
    and this makes the floor system to resist the gravity floors only

    so if the designer want to use this structure system in the highrise building, he can really assume and model the columns to resist the axial load only with mimium moments in both direction
    by using pinned command in etabs
    this type of floor - column connection can be named as non-rigid connections

    rigid connections is used in other cases and it has a very special detailing in construction to be able to tranfer moments


    regards,

    haytham sadeq
    senior student, civil engineering department
    qatar university

    من قال لك ذلك؟؟!!!!!!!!!


    هو إحدى أنواع الجمل الإنشائية فقط لا غير..

    وأما النوع المحبذ للجمل الإنشائية فهو الجملة الثنائية (جدران قص - إطارات)، وقد خضنا في شرح هذه الأنواع والفرق في حالات استخدامها في العديد من المواضيع السابقة في هذا الملتقى..

    مع تحيـــــــاتي..

    0 Not allowed!




  7. [7]
    mohy_y2003
    mohy_y2003 غير متواجد حالياً

    مشرف سابق وإستشاري الهندسة المدنية


    الصورة الرمزية mohy_y2003


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    اقتباس المشاركة الأصلية كتبت بواسطة ahm531 مشاهدة المشاركة
    Al Salamo Alekom
    Sorry for typing in english but that is because my computer containes no arabic letters.

    I have a question regarding ETABS, and looking forward to get some answers from the experts in this forum.

    I'm working on my graduation project which is the design of high rise structure, and I decided to model and Analyse it using ETABS 8.00.

    My question is, when I enter the beams and Columns elements, There is a filed to select the moment releases where I have to select between Pinned or Continuous? How does this selection affect the analysis and design results, and what is the difference between this option, and the option of assigning Joints restrained from the menu "Assign"?
    peace on you
    in order to get maximum benefit of all structure members , the designer must takes the columns into consideration to resist the horizontal forces , in such a manner that will distribute the effect of the horizontal force to resist by all length or width of building which tends to obtain more economic sections and reinforcement for shear wall , as well as enhancement the over all resistance of the skeleton against the horizontal forces
    so it is prefer to make rigid connection for some selected columns and beams to act as a frame , sharing with the shear walls resisting horizontal forces, according to the chosen structural system and the geometry of the architectural design for the project

    thanking you

    0 Not allowed!



    ليس ضروريا ان تكون عميلاً لتخدم عدوك .... يكفيك أن تكون غبيــــــــــــــــاً

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