This is a concrete lid that is buried under ground that spans 8'-0". The amount of soil cover ranges from 0' - 4'-0". There is a single lane going in each direction. This roadway is not a busy roadway and is pretty much a low traffic service road.
One piece of literature I found online, is...
Thanks for your help! This design is for an underground tunnel with a concrete lid. The lid is to be designed to withstand vehicle traffic loading. To stay on the conservative side, I am just going to design the concrete with a 12" strip width. Following ACI 318 (22.5.5.1) Vc =...
I am working on designing a one-way slab with a concentrated point load on the slab due to vehicle traffic. Running this, I find the Vc is not enough to resist the large shear loads seen in the one-way slab. I don't want to increase the slab thickness to get this to work, so I would like to...
Section 3.5.2 essentially states that your deflection calculations shall be determined by putting a creep factor, "Kcr", on your dead load. For a simple span beam your typical deflection equation is all you need. Just determine the long term deflection (Typically Dead Load) on it's own and...
Thank you! I have seen some data from TTU, but I was not able to find a comprehensive overview. This document is extremely helpful.
I was also able to find more helpful direction in FEMA P-361, third edition Part B8. This section is a good reference to clarify debris impact loading and...
I am currently designing a Storm Shelter following the ICC 500. The building is roughly 36'x40'. I am using CMU walls and wood trusses spaced at 1'-4" o.c.
I am looking at the ICC 500 and I see there is a Missile Criteria in section 305. The design wind speed for this building is 200 MPH...
I was thinking I should be applying a pointload at the end of the cantilever joists. (I'm using 2x4s laid flat). I currently have them spaced at 1'-7" with a cantilever of 1'6". I will need to tighten this spacing up when applying this load at the end. I've run through the analysis and the...
Hi all,
I am taking up a side project on my own where I plan on designing a "floating" bed frame for my bed. I want this bed frame to cantilever out to give it the illusion that it is floating. I have been working on the design my self and have been working on a few custom features that I...
I went with the E*I method.
I determined the load required for the LVL and the 2x8 joist to deflect the same using the deflection equation. 5wl^4/384EI
Doing so I come up with the following relationship ->
W LVL /EI = W2x8/EI = WLVL / 111,140,000 = W2x8 / 66682000
WLVL=1.667W2x8 telling me...
Hi all,
I am wondering what the best process is to determine the strength of combined section with different properties.
I currently have an existing building with 2x8 SPF No. 2 joists at 1'-4" o.c. … This existing building is very under designed and I need to reinforce these joists with...
