Questions tagged [structural-analysis]
Structural analysis is the determination of the effects of loads on physical structures and their components. Structures subject to this type of analysis include all that must withstand loads, such as buildings, bridges, vehicles, furniture, soil strata, prostheses and biological tissue.
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What is the standard maximum loading required for an elevator for a 5-storey of 2 bedroom residential apartments?
What is the standard maximum loading required for an elevator for a 5-storey of 2 bedroom residential apartments (2 units on a floor), on a 100*35ft land. I will be grateful for the full specification ...
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Iterative Method through FEM
Due to reasons, I can not fully describe the process explicitly so I will be using substitutes to represent the variables.
Nomenclature:
x - an independent variable
y - another independent variable
Fz ...
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How to determine whether a threaded rod will rotate under load
A part of a structure I am designing incorporates a large threaded rod (1") diameter mounted vertically both for structural strength and for the potential to adjust the height of the top mounted ...
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Design forces for a home built trailer structure (tiny home or camper)?
I am going to purchase a steel trailer frame, and then I want to build a camper on top of that. This will be full height teardrop which is likely wood framed but I am also considering aluminum framing....
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Dual Axle Tiny House Trailer Build; Question About Structural Integrity of Trailer Design
I have questions about the fabrication of a tiny house trailer I am building. The questions are focused primarily whether I am adding enough cross supports.
My overarching design principle:
That of a ...
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Which design is most resistant to tipping against 90 degree downward force?
Have a question sort of related to question at (What calculation to find how much force before tipping over?) but with slight modifications.
Trying to weld some tubing together and onto a heavier base ...
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Calculation of Drone Fuselage Natural Frequencies
I'm looking to do a frequency analysis of a fixed-wing drone. The goal is to calculate the first few natural frequencies of the fuselage to verify there is no resonance with the wing structural/...
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Benchmarking Geometrically Exact Beams: Clarification Needed on Material Density?
In an early paper on Simo, I came across an example titled "Cantilever 45-degree bend subject to fixed and follower end load". A force of $600N$ and $300N$ was applied at the end, resulting ...
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Why do two simply supported beams stacked on top of each other deflect more than a single beam of twice the thickness?
If the thickness of each beam in the stacked configuration is 't', the thickness of the single beam is '2t'.
Explanations in terms of Euler Bernoulli beam theory, or any other explanation that is ...
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Boundary conditions for Clevis fork (linear elasticity)
consider the Clevis fork domain (see here for an image https://www.traceparts.com/it/product/camloc-motion-control-h1-stainless-steel-clevis?CatalogPath=TRACEPARTS%3ATP01001005&Product=10-12112014-...
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How to find the displacement at each interface of a composite structure subjected to shear force?
Imagine a block made of 3 horizontal layers of 3 different materials (shear moduli S1, S2, S3) and fixed at the bottom surface.
If I apply a displacement 'x1' (or shear stress 'V1') to the top layer, ...
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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.
...
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Determining the critical load of a fixed beam with non-uniform cross-section?
I am a computer scientist, not a mechanical engineer, so it is absolutely possible that I am missing some basic understanding here.
I have a beam that is fixed in both ends and my goal is to ...
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Optimal shape for cantilever beam subject to body weight only
How can I find the optimal shape of a cantilever beam subject only to its own weight, and having the following restrictions?
The cross section is a rectangle
Only the height of the rectangle can vary ...
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How to calculate maximum buckling load for hydrofoil strut?
I am a hobbyist and in the process of designing a human-powered hydrofoil (see Hydroped for reference) I'm kind of stuck in the calculation of the the maximum buckling load for a strut.
The strut is ...
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Steel to aluminum structural equivalent
I am trying to build an aluminum trailer on an airbag suspension. The plans are for a steel frame and we are looking to construct it out of aluminum to save weight due to towing limitations. Not sure ...
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A benchmark to check the validity of a finite element analysis
Is there any well-established benchmark to test the validity of a finite element analysis, i.e. FEA? For example, a 3D model with specific loading and boundary conditions. Along with the expected ...
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How to find out the strain distribution of a block in a simple compression test?
I am performing a displacement-controlled compression test on a square block, where the top of the block is attached to a fixed plate, and the bottom of the block is attached to a movable plate that ...
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Thin wall pressure vessels: local stresses in bends
How can I calculate the stresses in corners where different geometries meet?
This image is a quick example of the positions i am referring to.
Additional information
In class we studied the membrane ...
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Building a pole mount solution for Starlink flat high performance dish - not the standard high performance dish
I have a flat high performance dish that is mounted on my RV. But I also have the need to mount it higher at one of the long term locations I will be staying at. There are lots of solutions for ...
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Will a rectifier based on air gap and flexible foil work?
The white line is a flexible conducting foil suspended on the metal wire. I think the external DC circuit will induce a charge on the flexible part and the other charges move to ground. The charged ...
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Fixed End Moment for a point load at edge span
Usually, i solved this kind problems by divide into 3 span, AB, BC, CD
Then, using Fixed End Moment and Cross Methode to find the Moment
But, i cant find Fixed End Moment for the point load at the ...
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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}{...
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Predicting breaking force of beam per length based on one testing
I've made a plywood carbon sheet and tested its breaking force, for a 200mm long, 50mm wide, 16mm thick it was 100kg +-
I was wondering if it's enough to help me predict what will be the breaking ...
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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 ...
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Building a land bridge across the Bering Strait
Would building a land bridge across the Bering Strait be more cost effective then building an actual bridge or tunnel? Much like how the Chinese build artificial islands in the South China Sea.
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Buckling of supported pillar
I am wondering how the "buckling number" of a timber column is altered by having a vertical element attached to it. Blue is the roof, green a concrete wall and black is the timber column and ...
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Overweight construction equipment for weight restricted plaza
We have to use our equipment on a elevated plaza that has a weight restriction of 2,400 lbs. per sq. ft. Each tire (4 total) carries a weight of 10,050 lbs. (1/4 of the gross weight of machine 40,200 ...
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Units of measurement for structural analysis
FEA engine
I'm using CCX finite elements analysis engine along with its pre- and post-processor CGX:
http://www.dhondt.de/index.html
https://github.com/calculix
Example
I'm looking at one example here ...
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How to determine the flexibility coefficent of this six member truss using the unit-load method?
I'm studying the Flexibility method described in the book "Matrix analysis of framed structures" by James M. Gere but I'm having a hard time understanding one of the examples. I'm stuck at ...
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Designing a footing to accommodate changing applied moment under ULS constraints
I am currently working on a system that will calculate the reaction distribution $p(x)$ across a footing with an applied load $P$ and applied moment $M$. There is one case that has me stumped: when ...
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Finding the bending moment diagram for an indeterminate continuous beam
In a recent lecture, we had the following example of an indeterminate continuous beam where we must find the redundant support reaction at $A$:
This was found by removing the support at $A$, and then ...
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Dlubal Rfem Seismic Analysis
I’m learning Dlubal Rfem recently and I have a problem about seismic analysis. When Equivalent Lateral Load is bigger than Modal base shear;for example on Sap2000 we scale modal base shear and we make ...
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Stress and Displacement of Cantilever Plate with a Uniform Load
Does any one happen to know of any resources that describe the stress and displacement of a uniformly distributed load in the direction perpendicular to the length direction of a plate analytically? I ...
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Calculating the required dimensions of horizontally-oriented weight-bearing beams
In the image is a design for a chemical etched piece of metal. Shown in white are holes formed in a sheet of metal, which is shown in grey. Highlighted in the red circle is one of four sections that ...
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How much force is acting on the screws I used?
Years ago I built a vertical rack to store long lengths of wood. The rack was built using 2x4" pine scrap. Imagine a typical wall assembly with a single top and bottom "plate" (2x4) ...
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Optimizing Simple Truss Member Angle
I am trying to optimize the angles alpha and theta, for which members of truss would carry the less loads. Given is location of force and value of force.
Problem is, that I get contradictory equations,...
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When should a bolt and hole be tapped at an angle, if ever, from a structural/strength standpoint?
Assuming the head of a bolt makes proper contact with its surface and clamps properly, and tapping an angled hole is not an issue, when would an angled bolt and hole (relative to the primary surface) ...
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Tension forces in a cable and reaction at the supports
I made this problem to better understand how supports react to tension forces.
Here we have a weight Mg attached to a cable, the left side of the cable is angled at 10 degrees, while the right side is ...
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What will the reaction forces of a support be in case of an angled cable
If a cable is attached to a support on each side, and there is a load acting on it somewhere along its length.
Is there going to be a vertical reaction force only if the the cable is angled?
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Why are stress intensity units MPa√m
The units of stress intensity are usually taken as MPa√m. Cracks are usually measured in (mm), could someone please explain why this convention is used an not consistent SI units
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Tensor of inertia of a curved beam
I need help calculating the inertia tensor for a curved beam.
I found the formulas for this in the article https://hal.archives-ouvertes.fr/hal-01084693/document[page 20, Appendix A] and decided to ...
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How to find Tensile Modulus of a layer of Plain Woven GFRP with GSM of Fabric given
I need to Input "E" the tensile modulus for analysis of a composite layer made from Plain Woven E-Glass Epoxy composite material.
I know the GSM (g/m^2) of fabric is 106.
Using GSM =106, ...
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Building Below-Grade Octagonal Room - Does this roof provide enough support for wet soil?
Building a small room below grade. Walls/Floor will be grouted stacked stone (apx. Rip-rap size, 2"-8" diameters). Roof design is intended to be set and grouted in on top of stone wall. Soil ...
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Advice on building an aquarium stand
I'm building a kitchen/bar in my unused basement area, and want to incorporate my 180 gallon saltwater aquarium into the design.
Before I decide on a design, I wanted to ask for advice/opinions on ...
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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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Calculate bending moment on cantilevered I beam
I am not an engineer, and the maths that I have seen on other forum posts is beyond me.
I am trying to calculate the load that can be supported by a cantilevered Ibeam.
The data is as follows:
Width: ...
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Energy dissipation from inelastic yield vs viscous damping
We divide the base shear of a structure during earthquake by R factor, to bring it down, to account for inelastic deformations. So let's say R factor of 4 means we divide base shear by 4 and design to ...
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Solving truss member forces graphically
Is there a way to solve truss member forces of a complex truss like fink roof truss where the {Edit: external} forces and reactions are known, the angles of all the members and the total base length?
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Structural Question Regarding Moving a Post
We have a post in our living/dining room that is inconveniently placed that we would like to move a few feet. One structural engineer briefly glanced at it and said that we could move it, but I am ...
