Truss self weight

[Darkrob_DIY]

Hey everyone,

Just wondered if anyone could tell me how to work out the self weight of a truss?? Any advice would be much appreciated.

Rob Critchley

 

[noseall]

is it me or is that rather an open ended question?

 

[jeds]

Measure the dimensions of the timbers and add up the lengths of each dimension and convert to a volume. For example:

11metres of 90x38 principle timber will be 11.0 x 0.090 x 0.038 = 0.03762m³
3.5metres of 70x38 for struts and ties will be 3.5 x 0.070 x 0.038 = 0.00931m³

Total volume = 0.00931 + 0.0376 = 0.04691m³

Then multiply x timber density of approx 400 kgs

0.04691 x 400 = 18.76kgs

This would be quite a small truss you obviously need to take your own dimensions.

 

[Darkrob_DIY]

Thanks for that much appreciated!!!

Just gotta find out how to size the members now lol.

Cheers

Rob Critchley

 

[Static]

Thanks for that much appreciated!!!

Just gotta find out how to size the members now lol.

Cheers

Rob Critchley

Are you designing your own truss or checking an existing?

 

[Darkrob_DIY]

Im designing a scissor truss as part of a university project - ive been having a look at BS8103 Part 3 for sizing the members but it only seems to cover common rafters.

Anyone got any pointers?

Cheers

Rob Critchley

 

[Static]

Fun,

Try BS5268 Part 3 (2006), gives the general BS design..

Good luck

 

[Darkrob_DIY]

Cheers static, much appreciated!!!

and yes its mucho fun