] [Thread] [Date] [Author]

["Syed Faiz" <sfaiz(--nospam--at)saudioger.com>]

Title: relation b/w peal ground acceleration and Seismic Zones

Dear Sherman:

 

I was a little busy and forgot to send

my thanx to you for your help.

 

Thanx again and best regards.

 

Syed Faiz Ahmad; MEngg, MASCE

Senior Structural Engineer

Saudi Oger Ltd

P.O. Box: 1449

Riyadh-11431

Saudi Arabia

Cell: +966-508-169304

-----Original Message-----
From: Sherman, William [mailto:ShermanWC(--nospam--at)cdm.com]
Sent: Monday, October 10, 2005 4:24 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: relation b/w peal ground acceleration and Seismic Zones

This would be my approach to resolve this question:

 

2.4 to 4.0 m/s^2 = 7.87 to 13.1 ft/s^2 = 0.24g to 0.41g  (where g=32.2 ft/s^2)

 

If the Soil Factor is 1.0, this would roughly relate to Zones 3 to 4 (Z=0.30 to 0.40).  However, "ZS" should be considered together to determine the ground acceleration for a given site.  If "S" is higher than 1.0 then the related "Z" would be lower.

 

For ASCE 7 related parameters, Sds is 2.5*ground acceleration, so these values would relate to Sds values in the range 0.61 to 1.02.  Again, these factors would include soil effects (Fa).  (The related MCE value at short period, Ss, would be 1.5*Sds/Fa.)

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)cdm.com

 

---

From: Syed Faiz [mailto:sfaiz(--nospam--at)saudioger.com]
Sent: Sunday, October 09, 2005 4:49 AM
To: SEAINT
Subject: relation b/w peal ground acceleration and Seismic Zones

Dear all:

I write to you all for a small favor and I am sure some of
you being expert on the subject should be able to provide
that help to me.

Could any of you give me a correlation between Peak Ground
Acceleration (in m/s2) and the Seismic Zoning? For example
what in your opinion should be Zone number for a region having
a predicted Peak Ground Acceleration value of between
2.4 to 4.0 m/s2?

Your help and immediate response shall be appreciated.

Thanks in advance and best regards.

Syed Faiz Ahmad; MEngg, MASCE
Senior Structural Engineer
Saudi Oger Ltd
P.O. Box: 1449
Riyadh-11431
Saudi Arabia
Cell: +966-508-169304