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O
OLUBUKOLAADEBOY10-Marble
10-Marble
November 3, 2016
Solved

Interpolation (Seismic values for Fa and Fv

  • November 3, 2016
  • 11 replies
  • 6829 views

Good Evening Mathcad Community,

Would anybody please help me with the attached file. My goal is to do interpolation given a period T.a =0.5*sec, based on site_class and the header Sa(0.2*s)  for Fa(site_class, Sa(Ta)) and

same for Fv(site_clas,Sa(Ta)), I'm having problem as to how to program this in Mathcad. I will appreciate this if anyone can help.

Regards,

Boyetr

Best answer by Werner_E

If linear interpolation is sufficient, I guess that the attached should do the job. Just a quick hack - no error checking for invalid site_class is implemented and ORIGIN=0 is assumed.

Regards

Werner

11 replies

W
Werner_E25-Diamond IAnswer
25-Diamond I
November 3, 2016

If linear interpolation is sufficient, I guess that the attached should do the job. Just a quick hack - no error checking for invalid site_class is implemented and ORIGIN=0 is assumed.

Regards

Werner

O
OLUBUKOLAADEBOY10-MarbleAuthor
10-Marble
November 3, 2016

Werner, Thank you so very much.

Regards,

Boyer

O
OLUBUKOLAADEBOY10-MarbleAuthor
10-Marble
November 4, 2016

Good Afternoon Werner,

Please see attached pdf file. On the subject on earthquake, the values generated  for Fa and Fv seems to be off and I do not know why. Would you be kind to review the Mathcad function linterp.

Regards

Boyer

M
MJG1-Visitor
1-Visitor
November 4, 2016

The equations Werner provided to you calculate:

  • Fa as a function of site class and Sa(0.2)
  • Fv as a function of site class and Sa(1.0)

They are not functions of Ta as seems to be indicated.

Therefore, his equations appear to match the values shown in your attachment:

O
OLUBUKOLAADEBOY10-MarbleAuthor
10-Marble
November 5, 2016

Good Evening Mark,

Thanks for your comment. What should I do to resolve the issue in the function statement.

Regards,

Boyer

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