how can l solve the problem? - Structural Analysis and Design - Forum - Structural Analysis and Design - Bentley Communities

how can l solve the problem?

when l run the design of beam, the warning information is indicated below,

Member 1: Failed tension calculations for hogging at 0.000 m. Design not possible.
Member 2: Failed tension calculations for hogging at 0.000 m. Design not possible.

who can help me expain the reason?

thanks

11 Replies

  • can you attached your model sir pls?

  • In reply to rekcah:

    sir,

    thank you for your support.

    Pls find attached model,  

    one more question, what is the difference between the plate and surface when l consider the modelling the building? beacuse l do not know which type should be use for different situation, can you give me some explanation or take some example to make it clear please?

     by the way, l'm new for the staad pro, so hope you can give some necessary assistance, thank you.

    Concrete frame-1 simple.std
  • In reply to shoaib:

    For a comparison of plates with surfaces, see the following discussion

    communities.bentley.com/.../202064.aspx

  • In reply to shoaib:

    Hi,

    There is no design command in your code. Which country code did you used for design.

  • In reply to vivekshine:

    thanks vivekshine,

    british code is used on my computer,  

  • In reply to shoaib:

    Hi vivekshine,

    The design work here is mainly building (R.C.C and steel structure) and other infrastructure component like shallow foundation,

    can you give me some advice to master the procedure of design of staad pro please? or how can l find good solution for that?

    thanks a lot.

  • In reply to shoaib:

    Hi,

    STAAD Pro is very easy software to learn & use. But you must be familier in structural design standards.

    To become familier in STAAD use tutorials & get support from bentley.

    For shallow foundation design you can use STAAD foundation software.

  • In reply to vivekshine:

    hi vivekshine,

    As for the floor in concrete frame and steel frame, which type of element (surface, plate or solid, as l know that the surface is usually appicable to shear wall, and plate to floor, but, in fact, l do not know how to distinguish the identifiation and difference in different situatioin.) shoul be applied, and can you tell me some difference between them, and how to mesh for both element generally, beacuse l find out that some different output result from varies setting in same load and same structure.

    for example:

    1. for each story, a whole surface applied or plate for each space divided by beam, which one is better, what is the difference for them in the analysis?

  • In reply to shoaib:

    Hello Kazeem

    There are 2 modes by which design can be done in Staad, the batch mode and the RC Designer mode.  The batch mode is the normal mode where the analysis and design is done. The RC Designer mode is specially for concrete design purpose and for BS 8110 it is recommended to use the RC Design module. Kindly see the attached screenshot.

    Also, I have used BS8110 for the batch mode , and the corresponding model is also attached.

    A hogging moment of nearly 420 KNm is developed at the start of the beam , the depth provided 300mm is not sufficient for it . As you increase the depth ( or width , but preferably the depth ), the design is carried without any such warning messages.

    As you are new to Staad, if you have any problems with the analysis and design of your models, kindly create   a Service Ticket and Bentley Technical Support will help you.

    Thanks

    Shayan


    This is a test

    Concrete frame-1 simple.std
  • In reply to Shany:

    Kindly see the screenshot attached.


    This is a test

  • In reply to Shany:

    very kind of you,  vivekshine,

    in fact, bs 8110 is already replaced by BS EN, so in case the output was refused by checker beacuse of BS code should be updated, what should l do?

    Repeat load is applied in the updated model (concrete frame-1), l wonder when (what situation) should consider this load case? usually, what case is applicable to?

    thank you so much.

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