About designing of a structure

Hello everyone 

My name is Sara from Italy, I am very new to the Sacs, could you please help me

First of all; after assigning all the member sections in order to perform static analysis, shall I calculate all the section's self-weight by myself and then impose it as distributed dead loads on the structure or SACS automatically calculates the weight of sections and consider them as self-weight of the structure?

secondly, when I do not impose any kind of dead load on the structure, in TOW analysis for inertia analysis and calculating roll, pitch,heave there will be nothing !!! so I wonder that must impose the self-weight of the structure as a distributed load in order have inertia forces. Am I right or wrong?

thirdly, what is the sequence for transportation analysis I mean: firstly, I created my model, then I generated TOW analysis, and thirdly members check by means of static analysis. am I right?

Please guide me, I urgently need your help 

Thank you in advance 

Sara

  • Hi Sara,


    Nice to meet you. Here is the answer in the order they posed.


    1. SACS can calculate self weights of structural elements, but they are not automatically considered. I mean, you need to let SACS know you want to include the self-weight effect for the stiffness analysis. There are many ways. One of the ways is to generate a load case due to self-weight as a separate load case in Precede (Load ->Self Weight) then combine it with other load cases.

    2. You mean you excluded the self-weight of a structure when generating inertial loading in your tow input file? If so, as you said, the resulting load cases could be zero if you do not have any user-defined weight properties or loads. It seems this is not what you want. Then, include the weight of modeled elements for the inertial loading. Check column 27 - 28 on the TOWOPT line.

    3. I am not sure what you did. For your reference, there are many ways, but basically, you need a structural model and load cases to be solved. I mean you need the loads due to motion, self-weight, and other loads that you want to check with. These are basic ingredients of strength analysis during transportation.

    Please let me know if I misunderstand your question.
    Thank you.

    Best regards,
    Bitna

    Answer Verified By: sara james