need help.... beam overhang strength
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Posted by: merc460 ® 05/29/2006, 19:58:03 Author Profile eMail author Edit

I am building a race motor and will need to move it from my building to a bed of a truck. I have a structure designed but need to know what beam to use. The beam will be 10' long with a 5' unsupported overhang for truck bed access. I was thinking of a beam with 4" flanges 4" tall, 1/4" thick. The weight needed to safely carry on the end will be 1000 lbs. I will have an electric winch on a beam trolley with this structure. The V frames will be bolted to the floor. A rough dwg. attached. If the beam mentioned is not enough what beam would be reccommended.   Modified by merc460 at Mon, May 29, 2006, 23:46:04

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Re: need help.... beam overhang strength
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Posted by: merc460 ® 06/02/2006, 12:10:04 Author Profile eMail author Edit

I have found a beam 4" 7.7 (S beam) .....will this work???? Modified by merc460 at Fri, Jun 02, 2006, 18:56:21

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Re: Re: need help.... beam overhang strength
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Posted by: swearingen ® 06/05/2006, 07:00:39 Author Profile eMail author Edit

No, the S4x7.7 will not work. It barely works if it is continuously braced, which this one will not be...

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Re: need help.... beam overhang strength
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Posted by: Scooter ® 05/30/2006, 09:00:46 Author Profile eMail author Edit

Assuming the beam as closely as discribed, It would be a wide flange (W4x13). Also, as discribed, The supports "Fixed" to the floor, Your situation looks like this: Mmax= PL=1000 x 60"= 60,000 in.lbs. Z required= M/Sa= 60,000/21,600= 2.777 < Zx@ 6.28,therefore O.K. Sa = Max. Allowable Stress Value for A-36 steel beam. Z req. = Section Modulus Required. Zx = Section Modulus of Actule W4x13 Beam. Looks like your present set up is O.K. for the Job. Note: I would check to be sure the beam is truly a W4x13. A lot of Misc. sized beams are availible, but may not the properties you want. Hope this helps, Scooter

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Re: Re: need help.... beam overhang strength
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Posted by: merc460 ® 05/30/2006, 18:04:12 Author Profile eMail author Edit

Thank you very much. Your time is greatly appreciated! Now...off to fabricate!

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