# Questions tagged [structural-beam]

A structural element whose length greatly exceeds both its width and height, which are of the same order of magnitude.

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### FFT plot not aligning with lower natural frequencies

I have a cantilever beam with gapped springs on top and bottom and an impulse is given at the free end initially. I modelled it using finite element method with 30 elements. The beam then oscillates ...
24 views

### Is Euler–Bernoulli beam theory still correct for non-constant (but continuous) beam cross-section?

How can I use Euler–Bernoulli beam theory for non-constant beam cross-section ? The beam is modeled as a continuous cone of known inner and outer diameters (both a function of $x$ the distance from ...
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### Strength Calculation of a Simply Supported 3D rectangular beam Under Loading As Shown In Image Attached

For a 2D and 3D circular beam we can easily calculate the strength of beam and reactions using beam theory. The same can be used for 2D rectangular plate. Also for a 3D rectangular plate with uniform ...
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### How to find Shear Force and Bending Moment in Finite Element Method for a cantilever beam with many elements

I have a cantilever beam with lots of elements. I am trying to find the sheer force and bending moment diagrams of the beam. EVERY SINGLE TUTORIAL AND EXAMPLE I SAW ONLINE SHOWS HOW TO DO IT FOR A ...
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### Transverse Vibrations of a Cantilever beam. Why does the % change in nth natural frequency increases with n in this case?

This is the problem in detail I have a cantilever beam. Now I am making it stand upright and adding water for different heights of SUBMERGENCE I am doing this by adding an ADDED MASS term from the ...
1 vote
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### Why is the strain independent of the type of material (in beam bending)?

When a beam is bended, the strain that is produced above and below the neutral axis is proportional to the curvature of the beam and varies linearly with the distance from the neutral axis. But why is ...
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### As a pulsar beam is a gaussian beam does its diffraction depend on its cross section area?

Some point lasers with cross section area of few milimeters have a range of several kilometers. There is a angle of diffraction or spreading out of the beam that depends on frequency of the beam but ...
• 2,161
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### Deriving an equation for the SHM of a cantilever beam with a mass attached at the free end

I'm a high school student doing a research paper on the vibration of cantilever beams. Specifically, I am investigating the relationship between the mass on a cantilever beam and the time period of ...
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### If the range of a laser depends on its crossection perimeter does it mean that a wider beam would reach much longer distances?

If the range of a laser depends on its crossection perimeter does it mean that a wider beam would reach much longer distances? Let pressume that we can construct a 1m wide laser beam and as we know ...
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### Doubt in derivation of bending of beam, It's about derivatives and intergration

Radius of curvature of the beam in above picture is given as: $$\frac{1}{R} = \frac{d^2 y}{dx^2}$$ Please help me two points used as steps of a derivation in my book: How was the radius of ...
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### Why two wires are used in railway overhead equipment? [closed]

While watching the train video's I came across this overhead wires. After searching on internet I found that both catenary and contact wires carry same voltage and connected by vertical wires called ...
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When a load P is applied gradually on an object, the work done on it is the average of the initial and final loads, which is generally P/2 multiplied by the deflection Δ1. In the case of impact load, ...
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### Best location for supports of a horizontal beam?

What are the best locations for placement of $y$ supports for a beam of length $x$? This seems like a very basic physics question, but I have been unable to find the answer. Perhaps I am not sure ...
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### Euler beam equation sign confusion

Euler beam equation is defined as follows: $$M=-EI{\frac {d^{2}w}{dx^{2}}}$$ There is a negative sign, so if the second derivative of the deflection is negative, the moment is positive. When the ...
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1 vote
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### Deflection of L bracket [closed]

I want to calculate the deflection for an L bracket like https://imgur.com/a/0PabX0T to determine how thick I will need to make the steel for a workshop shelf. I have done the calculation using the ...