Questions tagged [foundations]
The foundations tag has no usage guidance.
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Mat Footing (Bending Moment Issue of the Short Strip)
Hi I'm a civil engineering student, I wanted to ask for help and clarification for the design of mat footing. I used the Rigid method and based my design on the ACI 336_2R and Foundation Engineering ...
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Mass Brick Settling Causing Excess Load On Center Beam
I live in a 115+ YO building and recently had my kitchen remodelled. During this the subfloor was replaced (old 1x6s in bad shape). I noticed a significant bow in the joists with the central steel ...
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Shoring beams properly installed?
Question about a home my wife and are looking at purchasing. The garage had an office/apartment on the second floor, and the seller disclosed that the floor had sagged and been fixed with shoring ...
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Wood vs steel supports for small bridge
I'm interested in building a small access bridge across a creek on my farm. This bridge will be approximately 5m long and 3m wide and my tractor is about 4000 pounds. I read somewhere a long time ...
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Grade Beam vs Wooden Pile Foundation
We are in the design phase of a home at the New Jersey seashore. We are having a hard time deciding between a grade beam over pile foundation or having the home built on a regular pile foundation.
The ...
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Do we allow mass and moment of the footing itself, when calculating ground support and eccentricity of a footing?
Suppose we are designing a footing for the wall of a building. There are two checks that are crucial.
Ground support: suppose the ground is assessed as being suitable to load up to 80 kN/m2. Then a ...
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Relation of shear strength to bearing strength of soil by formula
From formulas:
Shear Strength: $τ = c+ σ'\cdot sin\phi$
Bearing strength such as: $1.3 cN_c+ qN_q + 0.4B_γN_γ$
Now I know that bearing capacity decreases as the shear strength of soil decreases. ...
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Pouring large circular footing in segments
Lets say we have a very large and deep circular footing for a tall tower such as an industrial chimney or a wind turbine, and for convenience we want to pour it not at once but in sections. Can this ...
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How to make top of rebar cage of CIP pile exposed
A long time ago I saw that when cast in place piles were poured, the rebar cage was lowered all the way to the hole and the concrete was cast. After the concrete hardened, the soil around the top of ...
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PE exam: situations in which two question choices are close to my final answer: how to pick one?
Consider this question:
I solve this eventual question and my answer is 7.29667:
Among the question choices are 7 x 7 ft and <...
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Small building basement foundation moisture: permeable vs impermeable
I understand that moisture is the enemy of interiors. I know that the standard basement foundation for a house-sized building uses moisture barriers on the outside of concrete retaining walls to ...
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What does "crs" mean in structural engineering / construction?
In the realm of structural engineering, construction, foundation design, what is "crs" when talking about piles/posts? Is it an abbreviation? Does it refer to some sort of size?
Some ...
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How do extra building levels affect the foundation design apart for the extra load?
I have been talking to some structural engineers trying to find one to design foundations for my contemplated bespoke building based on hi-cube 40-ft shipping containers. The initial concept is just ...
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Distance of raft foundation outwards
Can you tell me (for USA) which code (or standard or guide) and in it where exactly I can see the distance required for the raft foundation, as far as how much it should extend horizontally beyond the ...
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Low pile capacity during pile driving
When driving piles, the resistance from the soil is constantly measured.
What happens when the expected resistance values from the soil are not obtained?
For a single pile or for multiple piles?
What ...
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