A client of mine (City) has a retaining wall that we inspected (as part of a larger inspection program) that is failing. The wall ranges from 2-6ft tall and supports a 2-lane road. The wall appears to be L-shaped CIP concrete and there is undermining/washout that has occurred in multiple spots...
I will fully admit to being rusty on the subject since I don't deal with it (hardly ever) and it's been a long time since school...
If I have a soldier pile (W-beam) with a hole in it for a tieback, and I want to reinforce the flanges to make up for the loss of the section at the hole, I would...
In AASHTO section 13.8.2, it discusses pedestrian railings as it pertains to the application of LL and WL.
I am curious about the case where you have a chain link fence that has no top 'rail' - only a tension wire. See attached for example from WSDOT.
The tension wire is clearly incapable of...
We are designing a pile supported slab that supports a building structure. The columns from the building sit directly above where the piles are with a 12" slab between to two elements.
In timber design, for shear, you can ignore loads placed within "d" of the support, where "d" is the depth of...
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We've been asked to check the use of a side-mounted handrail that will attach to a turn-down edge of sidewalk (5ft wide sidewalk). Project requires the use of AASHTO which shows 200lb point load + 50 PLF line load applied + 50 PLF line load in the direction of gravity. We can...
Are there any design guidelines and/or examples of how to calculate the capacity of a stake (rebar or 2x4) driven into the ground a few feet to support a knee brace for formwork windload? I'm sure if we ran an AllPile analysis, the capacity will be quite low, but in reality, it's pretty reasonable.
We are analyzing a trapeze support for MEP supports in a seismic zone. One of the elements of the trapeze is a threaded rod.
In reviewing the rod specifications, it has a safe working load of 5. (SWL = ultimate / 5)
I know that different industries and applications have minimum required FoS...
We are designing a secant pile shaft that's about 100ft deep. The contractor will use it to launch a tunnel boring machine for a tunneling project. The TBM will use hydraulic jacks to advance casing in the soil. Max loads applied is 2000 kips. We are checking various components of our shaft as a...
a contractor we're doing work for recently placed concrete in a 10ft deep, 3ft diameter shaft for a timber pole foundation. the intent of the concrete is to increase the passive bearing area to the diameter of the shaft instead of just the diameter of the pole, so we're not super concerned with...
i'm running a spectrum analysis on a steel frame tower. the tower has 4 columns and supports a heavy load near the top.
when i run the analysis, some of the load cases show that the diagonal braces that span from column to intermediate beams are taking the bulk of the vertical load. meanwhile...
i am examining the capacity of existing timber pile.
we are demolishing a portion of a timber pier, leaving behind a few timber piles and pier. this will reduce/remove some of the inherent stability of the overall structure since the whole thing was previously tied into existing rigid...
greetings,
i'm working on seismic retrofitting my basement (seattle area). originally, i thought my pony walls would be 48" or less, allowing me to use 4'x8' sheets of plywood horizontally. however, after opening up the walls, i now find that i'm at 52".
my question pertains to orientation of...
i need to design a brace for a contractor so that he can adjust the length of the brace by up to 12". to simplify construction and fabrication costs, i am thinking of using a double angle with a single hole for a bolt at each end. this hole would be a STD sized hole. for the plates that the...
I am tasked with trying to make a secant pile wall work for a contractor.
The contractor wishes to use 36" diameter piles. The primary piles will be concrete mix with f'c = 1000. The secondary piles will have f'c = 4000 psi with a large W section embedded. Like all contractors, he wants to...
