Hi,
I'm struggling to understand AASHTO's (Stnd Specs) guidance, which I have to follow instead of NDS.
I understand NDS's approach:
The derivation for equation H-2 above is as follows:
Then if you have a circle instead of a square cross-section, d gets replaced with r * sqrt(12), where r...
Hi,
I'm working on a tied arch. The deck is supported by continuous stringers. The stringers are supported by floor beams spaced @ 25'. The floor beams are supported by hanger rods attached to the arch ribs.
AASHTO requires (2) checks for shear studs:
Fatigue: Use VQ/It to calc shear flow due...
Hi,
The member is a steel box shape consisting of (4) plates held together with an angle in each corner. Each angle leg has a single bolt every 6" along the member length.
I calculated the shear on the angle bolts in the direction parallel to the span due to vertical shear using VQ/It.
For...
Hi,
I'm analyzing an old truss that has built-up diagonal members composed of (2) angles with lacing (forms a channel shape, with the lacing forming the web).
AASHTO Table 6.9.4.1.1-1 says the applicable buckling modes for channels are flexural buckling (FB) and flexural torsional buckling...
Quick question... Southern Pine has the following size classifications:
2"-4" wide
5"-6" wide
8" wide
10" wide
12" wide
5"x5" and Larger
Is "wide" the larger dimension? Is a 2x10 considered (2"-4") or (10" wide)?!
Thanks
Hi,
Background:
I'm load rating a 3-sided culvert with about 3.5' of fill. There are provisions for slabs and culverts scattered throughout AASHTO LRFD Chapters 3, 4 and 5 as well as the MBE, and I find it confusing what is applicable to culvert frames vs culverts with simply supported top...
