All Questions
Tagged with structural-engineering statics
66
questions
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Why do period and damping ratio affect acceleration?
In the table above, the period of the structure $(T)$, the acceleration coefficient on the structure ($g$ in terms of gravitational acceleration) $Sa(T)$, The damping ratio is expressed as $ζ$ .
As ...
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Can't find correct reaction loads for statically indeterminate problem
been working on this problem all day and I feel as if I am going crazy. I am using SkyCiv to confirm the right answer and cannot get close to it, I have messed up both my attempts at superimposing and ...
8
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3
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How does a church built from stones survive 70 years under water?
Following the recent news about the Sau reservoir in Spain, the draught revealed an 11-century stone church which has been under water for 70 years since 1962 when the reservoir was built.
How is it ...
- 300
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what are the compression forces in a strut if the strut is fixed
i am trying to match an experiment i have done and i dont know how to compute the force in the strut in terms of F given these boundary conditions. i have attempted to use fixed end moment equations ...
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Moment of Inertia Problem
Im currently studying for the FE exam and I came across a problem from a FE practice test that I'm confused on. The specific question is on the parallel axis theorem of a trapezoid and the D value ...
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42
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Load distribution for a load centered over the length of the middle joist in a 3-joist system
I'm not an engineer, but I'm trying to understand the correct analysis for what seems like a pretty simple case.
I'd like to know what the effective load on the middle joist is.
...
- 1
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58
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Superposition of cylinder stress and normal stress
I need to calculate the principal stresses for the given cylinder with thick walls inside filled with gas shown on this picture:
I used the Lamé equations, namely:
$$\sigma_{x} = p\cdot\frac{r_{1}^2}{...
- 119
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90
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What material performs best in this situation?
Take a long, thin rod, say .25 mm in diameter and 200 mm in length.
Filling these fixed dimensions, what kinds of materials could the rod be made of such that it minimizes how much the rod bends under ...
- 11
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how to determine the direction of support reactions in a truss?
Hi, I am not sure how to determine the direction of support reactions at point A and K. I know point A has a pin support, therefore, it can take in horizontal and vertical loads and point K has a ...
user38335
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57
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Best way to deploy a projector screen from the bottom?
I want to design a system for an electronically deployable projector screen, where when not in use the screen is stored at the bottom and there are no structural elements sticking up significantly, ...
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582
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Mechanism and static determinacy
I was doing exam question and am confused as to how to determine if the structure is a mechanism or not.
Say that j = number of joints, r = total number of reactions, b = number of bars.
For both (a) ...
- 101
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2
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216
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How to solve this complicated truss system?
Below is a truss I simulated in a truss calculator. I'm just wondering, how to solve for the compression and tension of each member and are there any method that can solve this?
My solution is I ...
- 31
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521
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Equations of condition: why are two moment equations around a hinge dependent?
I'm reading about static determinacy of structures here.
A quote:
Therefore, one extra equilibrium equation is added to the system due to the introduction of the hinge: either ∑MABB=0 or ∑MBCB=0. ...
- 2,269
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How to find clamping force from bolt preload?
If I have a piece of rubber between two steel plates, and four bolts (at equal preload) compressing the plates, will the total compressive force on the rubber be Preload x 4?
- 25
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357
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How exactly do forces transfer in different directions?
If we imagine the load being placed at the top of the below triangle, I realise that the downwards force is transferred into one which goes in a 'south east' and 'south west' direction down to the end ...
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