Need a book? Engineering books recommendations...

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

Fwd: Re: Codes

[Subject Prev][Subject Next][Thread Prev][Thread Next]
This is a multi-part message in MIME format.

------=_NextPart_000_01BC223F.9DDFB8A0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit

If it were not for the Conventional framing section of the UBC (Section
2326 of the 1994 Code) I would agree with you. Section 2326 is so full of
holes and deficiencies that an engineer would be a fool to follow it. 
Codes are not always written based upon intellegent thought. The recent
code for retrofit of lightweight wood framed structures UCBC Appendix
Chapter V is one such example of comprimises made on the philosophy that
anything you do is an improvement. The committee that wrote the code
consisted of representatives from all related fields including pest
control. SEAOC had only a couple of votes on the committee and
recommendations by SEAOC were essentially stricken from then final draft. 
Why you ask? Residential construction has always been considered low risk
and therefore not seriously considered in the code. Not until the cost to
repair broke many insurance carriers after Loma Prieta and Northridge did
the code get written. Rather than use an analysis approach, the weak link
of code required 1/2" diameter anchor bolts was assumed and all retrofits
worked back from there. 
Ben Schmidt SE did a couple of calc's on structures with raised first
floors and found that 1/2" dia. A.B.'s were not sufficient when placed at
6'-0" on center in a structure with two diaphragms transfering shear (roof
and first raised floor).
I don't believe that codes are "all" created with "A significant time and
effort [is] spent by practicing engineers and experts in their respective
fields to develop guidelines on which codes are based."
  
Sorry Ahmed, but a simple reading of this section of the code will show
that the code does not provide for requirement for a load transfer from
roof to foundation except at perimeter blocking. Interior shear walls are
neglected. This is only one of many problems that allow non-professionals
to design by prescriptive guidlines that are not adequate.

Dennis Wish PE

------=_NextPart_000_01BC223F.9DDFB8A0
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<html><head></head><BODY bgcolor=3D"#FFFFFF"><p><font size=3D2 =
color=3D"#000000" face=3D"Lucida Casual">If it were not for the =
Conventional framing section of the UBC (Section 2326 of the 1994 Code) =
I would agree with you. Section 2326 is so full of holes and =
deficiencies that an engineer would be a fool to follow it. <br>Codes =
are not always written based upon intellegent thought. The recent code =
for retrofit of lightweight wood framed structures UCBC Appendix Chapter =
V is one such example of comprimises made on the philosophy that =
anything you do is an improvement. The committee that wrote the code =
consisted of representatives from all related fields including pest =
control. SEAOC had only a couple of votes on the committee and =
recommendations by SEAOC were essentially stricken from then final =
draft. <br>Why you ask? Residential construction has always been =
considered low risk and therefore not seriously considered in the code. =
Not until the cost to repair broke many insurance carriers after Loma =
Prieta and Northridge did the code get written. Rather than use an =
analysis approach, the weak link of code required 1/2&quot; diameter =
anchor bolts was assumed and all retrofits worked back from there. =
<br>Ben Schmidt SE did a couple of calc's on structures with raised =
first floors and found that 1/2&quot; dia. A.B.'s were not sufficient =
when placed at 6'-0&quot; on center in a structure with two diaphragms =
transfering shear (roof and first raised floor).<br>I don't believe that =
codes are &quot;all&quot; created with &quot;<font size=3D2>A =
significant time and effort [is] spent by practicing engineers and =
experts in their respective fields to develop guidelines on which codes =
are based.&quot;<br> &nbsp;<br>Sorry Ahmed, but a simple reading of this =
section of the code will show that the code does not provide for =
requirement for a load transfer from roof to foundation except at =
perimeter blocking. Interior shear walls are neglected. This is only one =
of many problems that allow non-professionals to design by prescriptive =
guidlines that are not adequate.<br><br>Dennis Wish PE<br><font =
size=3D2><br></p>
</font></font></font></body></html>
------=_NextPart_000_01BC223F.9DDFB8A0--



--- Internet Message Header Follows ---
Received: from server1.seaoc.org (bqe.com [204.140.166.34])
	by host1.texramp.net (8.8.5/8.8.5) with SMTP id MAA26023
	for <rlewis(--nospam--at)techteam.org>; Mon, 24 Feb 1997 12:51:31 -0600 (CST)
Received: from key.cyberg8t.com by server1.seaoc.org (NTList 3.02.10) id
ma004406; Mon, 24 Feb 1997 10:48:01 -0800
Received: from Cyberg8t.cyberg8t.com (pdhost06.cyberg8t.com [207.67.173.15])
by key.cyberg8t.com (8.8.5/8.6.12) with ESMTP id KAA15112 for
<seaoc(--nospam--at)seaoc.org>; Mon, 24 Feb 1997 10:45:35 -0800 (PST)
Message-Id: <199702241845.KAA15112(--nospam--at)key.cyberg8t.com>
From: "Dennis S. Wish PE" <wish(--nospam--at)cyberg8t.com>
To: <seaoc(--nospam--at)seaoc.org>
Subject: Re: Codes
Date: Mon, 24 Feb 1997 10:43:48 -0800
X-MSMail-Priority: Normal
X-Priority: 3
X-Mailer: Microsoft Internet Mail 4.70.1160
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_01BC223F.9DDFB8A0"
Content-Transfer-Encoding: 7bit
Reply-To: seaoc(--nospam--at)seaoc.org
Error-To: seaoc-ad(--nospam--at)seaoc.org
X-Loop: seaoc(--nospam--at)seaoc.org
X-Info: [SEAOC]
Owner: seaoc-ad(--nospam--at)seaoc.org
X-POP3-Rcpt: seaoc-ad(--nospam--at)seaoc.org
X-Sender: seaoc-ad(--nospam--at)seaoc.org
Precedence: list
X-ListMember: rlewis(--nospam--at)techteam.org [seaoc(--nospam--at)seaoc.org]


__________________________________________________

Richard Lewis, P.E.
Missionary TECH Team
rlewis(--nospam--at)techteam.org

The service mission like-minded Christian organizations
may turn to for technical assistance and know-how.