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RE: Lag Bolts in Sht. Metal Straps

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Thanks for everyone's input on this subject. I've decided to go with Simpson's CS16 strap and SDS screws. I am using the NDS values for 0.19" wood screw in 16 ga. metal. I know that you need at least 14 ga. for 0.25" screw values, but I don't see why this isn't valid, (using 0.19" vaules for a 0.25" screw). I'll use a washer behind the SDS head. This is a California OSHPD job, so I am sure the clacs will be scrutinized very carefully.

Thanks again


From: "Marlou Rodriguez" <mbrodrig(--nospam--at)mbrodriguez.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: RE: Lag Bolts in Sht. Metal Straps
Date: Fri, 7 Sep 2007 18:17:19 -0700

I agree, SDS screws would be the best but you will need to use a strap that is at least 14 ga minimum. I do not believe simpson has any values for anything less than 14 ga.

Marlou Rodriguez, S.E.
MBRodriguez Engineering Inc.
2355 Oakland Road, Suite 14
San Jose, CA 95131
Tel: (408) 432-4866
Cel: (408) 761-5013


-----Original Message-----
From: Christopher Banbury [mailto:cbanbury(--nospam--at)arkengineering.net]
Sent: Friday, September 07, 2007 5:23 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Lag Bolts in Sht. Metal Straps

I second the earlier suggestion to use Simpson SDS screws. If you don't need anything over a 1/4" diameter then I believe you will find that these will give you higher allowable shear loads than you can calc from the NDS for any lag screw. In addition they are self drilling and have excellent tabulated pullout resistance.

Christopher Banbury, PE
President

Ark Engineering, Inc.
PO Box 10129, Brooksville, FL 34603
22 North Broad ST, Brooksville, FL 34601
Phone: (352) 754-2424
Fax: (352) 754-2412
www.arkengineering.net


-----Original Message-----
From: Marlou Rodriguez [mailto:mbrodrig(--nospam--at)mbrodriguez.com]
Sent: Friday, September 07, 2007 8:16 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Lag Bolts in Sht. Metal Straps

If you are going to attach your strap, use wood screws. For a 16 ga strap you can use up to a #10 wood screw. You can find single shear capacities from 2005 NDS table 11m.

Good luck

Marlou Rodriguez, S.E.
MBRodriguez Engineering Inc.
2355 Oakland Road, Suite 14
San Jose, CA 95131
Tel: (408) 432-4866
Cel: (408) 761-5013


-----Original Message-----
From: Larry Hauer [mailto:lrhauer(--nospam--at)hotmail.com]
Sent: Friday, September 07, 2007 1:30 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Lag Bolts in Sht. Metal Straps

Marlou,

Thanks for that info. re. being able to wrap a 16 ga. strap around the tank
perimeter- that is what I will use.

Larry Hauer


>From: "Marlou Rodriguez" <mbrodrig(--nospam--at)mbrodriguez.com>
>Reply-To: <seaint(--nospam--at)seaint.org>
>To: <seaint(--nospam--at)seaint.org>
>Subject: RE: Lag Bolts in Sht. Metal Straps
>Date: Fri, 7 Sep 2007 09:12:34 -0700
>
>I have used 16 ga straps to wrap around tanks in the past.  The key is to
>make sure that the effective section at your connections can resist your
>tensile load.  Use wider straps if necessary.  Depending on your load I
>would not use anything less than 18 ga.
>
>Marlou Rodriguez, S.E.
>MBRodriguez Engineering Inc.
>2355 Oakland Road, Suite 14
>San Jose, CA 95131
>Tel: (408) 432-4866
>Cel: (408) 761-5013
>
>-----Original Message-----
>From: Larry Hauer [mailto:lrhauer(--nospam--at)hotmail.com]
>Sent: Friday, September 07, 2007 7:09 AM
>To: seaint(--nospam--at)seaint.org
>Subject: Re: Lag Bolts in Sht. Metal Straps
>
>I'd love to use a thicker strap, but the straps have to be flexible to wrap
>around small diamter tanks. Did you know that those seismic straps around
>hot water heaters are only 26 gage, (0.018" thick)!!
>
>Larry Hauer
>
>
> >From: "Robert Kazanjy" <rkazanjy(--nospam--at)gmail.com>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: seaint(--nospam--at)seaint.org
> >Subject: Re: Lag Bolts in Sht. Metal Straps
> >Date: Thu, 6 Sep 2007 21:38:14 -0700
> >
> >14 gage is ~.075" thick, a much more reasonable thickness
> >
> >cheers
> >Bob
> >
> >On 9/6/07, Josh Comfort <jcomfort(--nospam--at)ggbse.com> wrote:
> > >
> > > Table 11K in the 2005 NDS has single shear values for 3/8" diam. lag
> > > screws
> > > w/ 14 ga. side member thickness:  G=0.5, Z(par)=200#, Z(perp)=130#.
> >Those
> > > values are for a penetration (p) of 8D into the wood. For 4D< p< 8D,
> >you
> > > multiply the values by p/8D.
> > >
> > > -----Original Message-----
> > > From: Larry Hauer [mailto:lrhauer(--nospam--at)hotmail.com]
> > > Sent: Thursday, September 06, 2007 1:32 PM
> > > To: seaint(--nospam--at)seaint.org
> > > Subject: Lag Bolts in Sht. Metal Straps
> > >
> > >
> > > I'm working on the anchorage of equipment to existing wood stud walls
> >and
> > > need to know what the minimum thickness of sheet metal strapping is
>for
> > > both
> > > a 3/8" diam. and 1/2" diam. lag bolt acting in shear and what those
> >shear
> > > values are. I understand the values ares in some light gauge metal
> > > handbook
> > > which I do not have. I would like the thickness to be the minimum
> > > possible,
> > > (24 ga.?), and still get an allowable shear value of about 400#.
> > >
> > > Thanks in advance.
> > >
> > > Larry Hauer S.E.
> > >
> > > _________________________________________________________________
> > > Get a FREE small business Web site and more from Microsoft(r) Office
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