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Questions on "Live Load Generation Details"

Dong Wang
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Hi, Dear All,

I have some questions regarding the "live load generation details".

First, it tells "values of live load generated at each bearing point are shown with impact factor". I did some hand calculations and I found actually these values (as in the following picture) are with multiple presence factor but not impact factor.

Secondly, it tells "4 axle on bearing Line No. 1". What does this mean? I have two bearing lines and this live load case is for "double truck with lane load".

Please help.

Thanks,

Dong

  • 0 Online
    On your question related to Impact factor and multiple presence factor .

    The impact factor is applied when the user clicks Run Analysis button in the Analysis TAB.
    Regarding the Multiple presence factor , if the user is inputting the LL reactions manually then he has to multiply the MPF with the LL reactions and then input the values in RCpier .When the user generates the Live load reaction then the program multiplies the LL reactions with the MPF in the LOADS TAB itself.

    On your question related to "4 axle on bearing Line No. 1".
    To generate Live load there are 2 methods which the user can chose .
    Constant spacing method and Variable spacing method.

    A very detailed explanation with visual representation is provided in RCPier usermanual.
    Please check the Theory part and page # TH 14 till TH-23.

    Answer Verified By: Dong Wang 

  • 0 Offline in reply to Vinay mysore
    Hi, Dear Vinay,

    Thank you very much for the help.

    Could you please let me know where I can find the latest RCPier or CONSPAN user manual PDF version? I found chm file as user manual in the LEAP bridge folder but it seems not the one you mentioned.

    Thanks,
    Dong
  • 0 Offline in reply to Vinay mysore

    Hi, Dear Vinay,

    I found a RC Pier User Manual (RC-PierV9.0.0). I went through it quickly and it explains horizontal distribution methods for live load very well and with pictures. However I still don't understand the words of  "4 axle on bearing line no. 1".

    Thanks,

    Dong

  • 0 Online in reply to Dong Wang
    Just plainly speaking "4 axle on bearing line no. 1 " means if there are 2 bearing lines then to get the Maximum reaction and torsion the program will place 4 axles side by side on bearing line no.1 which will be kind of worst case scenario.

    Answer Verified By: Dong Wang 

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