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That makes sense. My equivalent strip width is 16.58' (+/- 1" from your calculation).

TehMightyPirate, 1. How did you obtain such a larger value for the vertical earth pressure? What value are you using for the soil density? 2. It doesn't feel right to neglect such significant construction loads. 3. My value for item 8 was incorrect.

My inputs are as follows:(At 6ft below surface/at 9ft below surface) 1. Vertical Earth Load on the roof = 720/1080 psf 2. 3 and 4 axle HS20-44 Loads traveling across the culvert (applied in separate conditions) = 175/84 psf (4 axle) 3. (2) trucks side by side traveling parallel to the culvert =...

I came up with a final thicknesses of 12".

So, after double checking all the loads and conditions and every possible input field, I cannot find anything that is wrong with my design. Having said that, I've decided to call for shear reinforcing to bring the thicknesses of the walls and slab down a little. I always enjoy reading what...

I am modeling it similar to TxDOT's "Level 2: RISA 2D With Springs" example. They place 10 compression springs equally spaced along the bottom slab. I've played around with the spring constants and they don't seem to make a significant difference.

TehMightyPirate, Thanks for the input. I double checked all those and were properly taken into account. Right now, the load case that is governing the design is when the culvert has 9' of fill and the water table is assumed to be at the top of the ground surface. I'm thinking my calculation...

I am using Risa-3D.

Yes. I am using AASHTO. The roof on the culvert is flat and the cover varies between 6 and 9 feet.

Hello, I have been asked to design a new CIP box culvert that is to replace an existing culvert. The new culvert is 13'(W) x 15'(H) clear inside dimensions. I have already looked at several DOT (TX, KS, and MN) guides along with ASTM C857-12a and applied loads to it accordingly: 1. Vertical...

Detailshttp://files.engineering.com/getfile.aspx?folder=23f312e5-766f-4939-a6f5-c92e2b403988&file=227.pdf

I am needing to check a connection with shear and axial loads for a steel fabricator. There are 2 beams pinned to the web of the column and a moment connection to the flange. The fabricator has determined that stiffener plates are necessary and has, therefore, extended the gussets of the...

Thanks woodman88. I appreciate your advice.

Hi, I've been asked to check a framing connection in a residential house. The connection consists of two 2x6's and they're connected with a 3/8" plywood gusset plate. Connecting the gusset to the 2x are 8 staples on each side of each 2x6 (32 total). Is there a certain procedure I should use...