dropped object analysis in SACS

can any body please explain about dropped object analysis in SACS.

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  • From Section 1.3.3 of the Dynamic Response manual:

    The Dynamic Response module can predict the response of structure resulting from an impact from a

    vessel or a dropped object. The process can also account for fluid damping for a submerged portion of

    the structure by using either an equivalent fluid damping or alternatively the program can calculate the

    actual fluid forces at each step during the integration process.

    Also refer to Sample 18 in the SACS program directory which contains a complete dropped object analysis.

    Regards,

    Geoff

  • Dear geoff,

    Thank you for your response. 

    I am having 2 tones object ,it will fall from 5m height so i am getting energy of 392.4kJ ,i want to do dropped object analysis both static and dynamic in SACS ,

    How i can verify in sacs and how to give kJ as a force to SACS input,Please guide me.

    Thanks ,

    C.karthikeyan

  • C.karthikeyan,

    First of all, you can't express an energy as a force since the kinetic energy must be absorbed by the structure by doing work (1/2MV^2=F*x). That is why we have you use Dynamic Response to calculate the response. In the dynamic response input file, you can enter an DRPOBJ line with the object weight, height and initial velocity and SACS will automatically calculate the kinetic energy. There is an example of a dropped object, Sample 18, in the Sample folder of your SACS installation. I would also recommend reading section 2.6.12 for another example of a dynamic response input file with dropped object input.

    Regards,

    Geoff
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  • C.karthikeyan,

    First of all, you can't express an energy as a force since the kinetic energy must be absorbed by the structure by doing work (1/2MV^2=F*x). That is why we have you use Dynamic Response to calculate the response. In the dynamic response input file, you can enter an DRPOBJ line with the object weight, height and initial velocity and SACS will automatically calculate the kinetic energy. There is an example of a dropped object, Sample 18, in the Sample folder of your SACS installation. I would also recommend reading section 2.6.12 for another example of a dynamic response input file with dropped object input.

    Regards,

    Geoff
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