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  • Posts

    • It is indeed just a structure for the equipment. But I believe it is attached to the main structure in very a simple way (not enough to restrict the vibrations). I allready asked for more info on the vibrations (size, directions,..) . In the worst case, a new bracing can be placed in the 4 vertical planes + at floor level 1. (without considering access to the place)
    • Thanks for your comments, Whenever I post comment here I always expect your reply. Regarding 1090 they cover wide range of application hence difficult to understand. But they are covered under separate hEN standards eg. EN10025-1, EN14399-1 etc Also name of 1090 is execution of steel structure. Really confusing. I hope kingniro will add some imp points to this discussion. Thanks
    • Hello,   Is it a process equipment structure? (and machinery may be pumps or agitators) Any way in general, As you mentioned that machines are kept on level 1 then braces in between level 1 and 2 will not help to reduce vibrations. You will need to add bracings in between foundation (ground level in your case) and 1st level, since foundation acts as restriction to movement. (but make sure they are above operating height, if you need to access the level) Plane for addition of bracings will depend on the axis of rotation of your machinery shaft. If it is vertical then you will have to provide bracings in both vertical planes and if it is horizontal then in single vertical plane (perpendicular to axis of rotation) is sufficient. But to ensure the adequacy, you will have to go for calculations.   Also refer following document on google "Foundations for Dynamic Equipment ACI 351" open the first link "researchgate" it is really basic and useful.   Hope this will help.  

    • Only one link active. Can you upload this books somewhere or send to email? nem0v@mail.ru    
    • I need to give some advice to a customer about reducing vibrations in a steel structure.   The structure is +- 8m x 5m and has 2 levels (level 1 +-4m and level +-7m). This is an internal structure inside a larger building. The structure consists of steel beams and columns and the floors are a grid floor (besides the floor level 0 and the foudations there is no concrete in the structure)  We didn't do the original design of this structure. On level 1 they recently replaced the 3 old machines by 3 new (more modern) machines (old and new +- 1200kg each). These new machines produce vibrations and these vibrations find there way to the structure. I don't have an idea (yet) about the size or direction of the vibrations or the size of the movements in the structure. My suggestion was to use suitable damping blocks so the vibrations wouldn't go to the main structure. But the designer of these machines tells that this is not allowed due to the internal functioning of the some components. The machines have to be fixed to the structure.   The question is now: how can the vibrations (--> movements) of the structure be reduced? They allready made some adaptions (some extra beams in the floors) in the hope it would be better but this didn't help. Could extra braces in the vertical planes (some or all) and maybe also in the horizontal floors help? Currently there are only some minar braces is between level 1 and 2. There are no braces between level 0 and 1.   Any suggestions? Currently I only need to give some advice of possible sollutions.   
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