All Questions
Tagged with structural-engineering concrete
42
questions
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13
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How to model fibre reinforced concrete on LUSAS?
As part of my dissertation, I need to cross verify my finite element analysis results using LUSAS using some experimental results, and although i can find some stress-strain relation in some articles, ...
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18
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What does "dc" stand for in this Positive Bending Moment for Plastic resistance of a composite concrete slab formula?
I'm designing a building with a composite slab with profile sheeting and steel structure, while trying to test the resistance of the composite slab in "composite phase" to bending moment I ...
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23
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Ando dots or holes in concrete walls
I am making a concrete poured wall with holes where the bars to support the wood frame remain. Question is with plywood supporting frame what is the greatest distance between bars that will still ...
1
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1
answer
57
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Pumping water from under concrete slab basement
I have this situation, and wanted someone's opinion.
Info:
Concrete foundation basement, slab floor
Weeping tiles and a sump pump is present / operational
The house is near a pond.
Grading is alright,...
- 11
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16
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Strut-and-tie models for concrete corbel cracking
I'm interested in how to perform serviceability limit crack width checks for concrete connections. Common type of connection is a corbel connection, which I'm currently investigating.
I found one ...
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1
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52
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How to determine the resistance provided by cement mortar?
I am attaching a steel rail and post guardrail to the coping of an existing parapet. The actions produced by the guardrail on the coping incur at point A as shown below.
However, how do I find out if ...
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2
answers
41
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Why there are two equations to calculate effective depth for concrete beams? Eurocode
Are these the same? if so, why there are two equations given? is there a specific purpose? like, combining the equations for the ease of calculation etc?
Why there are two equations to calculate ...
- 3
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2
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544
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What does$ Ast = N16 @ 175mm $centres means in designing reinforced concrete?
I have the following problem, which I already know the general steps into solving.
My general approach is: calculate I cracked as we are already told that the section is cracked, and then finally use ...
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2
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54
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Question on plastic limit theorems and reinforced concrete
The lower plastic limit theorem is stated in Wikipedia as follows:
If an equilibrium distribution of stress can be found which balances the applied load and nowhere violates the yield criterion, the ...
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1
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70
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Are there any ways to know whether the element has failed under loading, while knowing only limited properties?
I opt to check whether a precast concrete wall (no reinforcements, only concrete) withstand both vertical and lateral loading condition but the only properties I know are the Young's Modulus, density, ...
2
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2
answers
809
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How to calculate the required prestressed jacking pressure to apply to a pre-tension concrete beam?
How does the fabricant of prestressed pre-tensioned beams calculate the equivalent pressure in the hydraulic jack (in bars) to the design prestress force (in kN)? Are there factors to multiply like a ...
2
votes
2
answers
40
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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 ...
- 21
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1
answer
88
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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 ...
- 211
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2
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80
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Can anyone help me with the concept of bearing stresses in steel reinforcement in Reinforced Concrete?
When there is tension reinforcement(steel) embedded in concrete, does it not also undergo bearing stresses on account of the weight of the concrete and other forces which are acting above the steel? ...
3
votes
3
answers
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Why is the stress distribution on concrete approximated like this?
I'm reading here on reinforced concrete. It is explained there that in calculations, the actual stress distribution is replaced by a constant stress distribution over some limited distance from the ...
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