• Search by the key word
    • and or
    Category list
    • EAll categories
    • >Admission
    • >Purchase
    • >FLIP programs
    • >Analysis
    • >Others
  • Question Are there examples of analysis for simulating the sequence of "Mainshock¨consolidation¨aftershock¨consolidation" using cocktail glass model element or multi-spring model element (without the sequence of consolidation)? What procedure should I take in this type of analysis?
    line
    Answer There are examples of analysis for simulating the liquefaction at Urayasu, Chiba, during 2011 off Tohoku-Pacific ocean earthquake (re-liquefaction by aftershock). The following procedure may be adopted.
    line
    line
    Detail

    (1) Perform initial static gravity analysis.

    (2) Perform the first portion of earthquake response analysis. After the shaking ceases, continue the analysis until the response of ground also ceases (10 to 30 seconds). In FEAP command, specify input data to output structure restart file (#16).

    (3) After the first portion of earthquake response analysis, output restart file as usual (#11 or #12).

    (4) In the next FEAP command, specify to read the structure restart file and specify additional information not written in the structural restart file (such as data for DBSW command).

    (5) Follow the similar procedure to the first portion of earthquake response analysis for specifying MACRO commands. The different point is to read restart file (#11 or #12) with INITSW=1, specify large ƒÀ for Rayleigh damping (as large as 10 to 500 times as the original), and set large ƒ˘‚” (as large as 10 to 100 times as the original)B

    (6) Continue the dynamic analysis until the time of begging of the second phase of earthquake shaking and at the end output restart file (#11 or #12) as usual.

    (7) Execute FEAP command again to read structural restart file, and specify information that is not written in the restart file.

    (8) Similar to the first portion of earthquake response analysis, specify the MACRO commands and execute the analysis. Read restart file with INITSW=1. Set ƒÀ and ƒ˘t back to the original values.

    (9) The rest is to repeat the above mentioned sequence.

    Please prepare the earthquake motion file including both mainshock and aftershock.
    Free field response analysis is also required following the similar sequence of analysis for the primary analysis domain.
    For free field response analysis, the analysis after the earthquake response analysis of 2nd earthquake motion may not be required.
    • BACK