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  • 1.  Primary Secondary Structure Interaction

    Posted 10-09-2018 11:03 AM
    Edited by Tirza Austin 10-10-2018 10:45 AM

    Most of the researchers that have investigated the effect of a single electrical cabinet on the primary structure have concluded the following:  

    The mounting of Electrical Cabinet over the Primary structure will not reduce the peak response, i-e it will not work as a damper.

    The amplification effect due to building nonlinearity on the peak acceleration response of a linear nonstructural component will occur when nonstructural components are located on the lower floors of the building 

    Based on these conclusions, I have the following questions: 

    1. What is the effect when a cabinet is in a series? As in Practical, the cabinet is not a single secondary structure. Considering the effect of one cabinet and comparatively with multi-cabinets will cause some effects based on PSSI.

    1. Will weights of the cabinet and support condition effect the primary structure?

     As the weight of one cabinet is 287kg. If we are using the 5 cabinets, is the weight effect significant enough to be considered?

    3. Will the high frequency of the cabinet and position of the cabinet tend to change the response of the primary structure? 



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    Kashif Salman P.E., EIT
    Research Assistant Brain Korea21
    Arabian center Design & Engineering Consultant
    South Korea
    8210 32493087
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  • 2.  RE: Primary Secondary Structure Interaction

    Posted 10-10-2018 10:44 AM
    Edited by Tirza Austin 10-10-2018 10:44 AM
    Concern regarding affecting in primary structure due to adding on seismic load if countered cabinet weights might not be an issue if the structure is designed accordingly. Significant dead load and live is included in the design of structures. However none of the structural elements such as cabinet can cause major damage and economic loss. For that reason try use certified bolts where it needs to connect cabinet to primary structure.

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    Sayed Maqsood S.M.ASCE
    Oakland CA
    (510)395-4361
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  • 3.  RE: Primary Secondary Structure Interaction

    Posted 10-12-2018 10:03 AM
    Edited by Tirza Austin 10-12-2018 10:02 AM
    Thank you, sir, for your quality response. Actually, I have simulated cabinets in series that means multi cabinets and I found that by increasing the number of cabinets effects the frequency and the change in the frequency in linear after 4-5 cabinets. Normally every researcher has analyzed only one cabinet and they didn't consider the effect of multi cabinets and from their conclusion, I got a clue that they overestimated the fragility and seismic performance evaluation. Here is my conclusion Sir.  of the electrical cabinet.

    ------------------------------
    Kashif Salman P.E., EIT
    Research Assistant
    Arabian center Design & Engineering Consultant
    Dibba Fujairah
    8210 32493087
    ------------------------------



  • 4.  RE: Primary Secondary Structure Interaction

    Posted 10-12-2018 01:42 PM
    Edited by Tirza Austin 10-12-2018 01:42 PM
    If your research is based off 5-6 cabinets placed in series, that might change in results. Go to the local building code find out the required capacity for structure that place cabinet in. You might not allowed to place 5 cabinets but for your research, it's OK. It's obvious that frequency and modes can change due change in input.

    ------------------------------
    Sayed Maqsood S.M.ASCE

    Oakland CA
    (510)395-4361
    ------------------------------



  • 5.  RE: Primary Secondary Structure Interaction

    Posted 10-15-2018 07:55 AM
    Edited by Tirza Austin 10-15-2018 07:55 AM
    Thank you, sir, for your quality response. The input is the same and the cabinets are always in series in many practical cases, and that is the reason I want to investigate the effect of multi cabinets response. Based on my preliminary analysis I concluded that most of the response parameters are overestimated. Fragility analysis is one of them.

    ------------------------------
    Kashif Salman P.E., EIT
    Research Assistant
    Brain Korea21
    Structure System Laboratory Korea
    8210 32493087
    ------------------------------