Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

RE: Basic Wind Speed in Indonesia

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Thanks alot for the info Harold. It's appreciated.

"Doldrums", I read, "that's got a violent ring to it, lets check my English-Icelandic dictionary....oooohhhh I see".

All fun aside, this is a very preliminary investigation for one of our clients, who supplies diesel power plants, and accompanying structures, all over the world. From your mail and info, I've gathered from USGS, USACE, and more, it seems that seismicity may be more of a problem, than wind loads in this area (the four possible project sites all lie along, or very close to, equator, between eastern longitudes 111-142).

Gunnar Hafsteinn Isleifsson

-----Original Message-----
From: Harold Sprague [mailto:spraguehope(--nospam--at)]
Sent: Monday, August 23, 2004 20:31
To: seaint(--nospam--at)
Subject: RE: Basic Wind Speed in Indonesia


There is a latitude that defines an area generally referred to as the 
doldrums.  It is roughly within 5 to 10 degrees north and south of the 
equator.  In the area of concern for you, the 5 degree latitude bisects the 
island of Papua New Guinea.  Below the line you have a frequency of 3-5 
typhoons per year.  Above 5 degrees are the doldrums.  Java and Sumatra are 
within the doldrums.  Timor is on the line where the typhoons form.  RE: The 
Designers Guide to Wind Loading of Building Structures, by N J Cook.  The 
Philippines are north of the equator and are probably not relevant.  The NW 
Cape of Australia with a wind velocity of 130 mph is relevant and the wind 
velocities increase dramatically to 130 mph.

In the area within the doldrums the TI 809-01 (AKA UFC 3-310-01) infers a 
default minimum of 80 mph (3 second gust) in the area of the doldrums.

Jon Paterka at CPP has done probabilistic 
studies in many areas of the world.  You may want to contact him to see if 
he can fine tune it.

Harold Sprague

>From: "Gunnar Hafsteinn Isleifsson" <ghi(--nospam--at)>
>Reply-To: <seaint(--nospam--at)>
>To: <seaint(--nospam--at)>
>Subject: Basic Wind Speed in Indonesia
>Date: Sun, 22 Aug 2004 23:54:11 +0200
>Does anyone on the list know the basic wind speed in Indonesia, i.e. 
>Borneo, Sulawesi, Maluku or Papua, preferably as UBC 3 sec. gust, Eurocode 
>10-min mean or UK-CP3 hourly mean.
>The closest I've come are Philippine Islands (90 mph) and Caroline Islands 
>(Koror, 95 mph) which I found in UNIFIED FACILITIES CRITERIA (UFC) 
>3-310-01. Extensive Internet search has been unsuccessful.
>Gunnar Hafsteinn Isleifsson

******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at:
*   This email was sent to you via Structural Engineers 
*   Association of Southern California (SEAOSC) server. To 
*   subscribe (no fee) or UnSubscribe, please go to:
*   Questions to seaint-ad(--nospam--at) Remember, any email you 
*   send to the list is public domain and may be re-posted 
*   without your permission. Make sure you visit our web 
*   site at: 
******* ****** ****** ****** ******* ****** ****** ********