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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Find the internal bending moment, Mc

A 7meter,m, long cantilever beam whose weight per meter is 19Newton, N, carries a load that varies uniformly from 43N/m, (Newton/meter), at the inbuilt side, point A, to 0 at the free end, point B. ...
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Counterweight requirement and platform design for motorised speaker stand stability

I recently bought my dream speakers (Dutch & Dutch 8c), but at the cost of having to preserve a minimalist interior for the sake of household peace. To that effect, I plan to construct motorised ...
talalalal's user avatar
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How much weight can aluminum square tube support?

I'm building a bed platform in a campervan and trying to determine what type of aluminum tube to buy. I'm thinking to purchase 6061-T6511 aluminum Square Tube with 1.5" width, 1.5" height ...
Cory Crowley's user avatar
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In a pre stressed concrete? Why is the top fiber considered as under compressive stress?

I have been solving problems involving pre stress concrete, i want to clarify why is the top fiber always considered as under compressive force, in my understanding the concrete would bend positively ...
Shear at its finest's user avatar
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Some questions about linear rail systems

there are many linear rail system configurations. Some with only one lead/ball screw in the middle and a moving platform with wheels aligning outside/inside/on top of one/two framing rail(s). Others ...
lovedrinking's user avatar
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Tensile Strength of Shear Strength for a fully supported member

I have an extrusion that is fully supported and will bear a wheel load. Considering its fully supported, should I utilize the shear flow equation to assess it against factors such as tensile strength ...
see_general_notes's user avatar
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Uniform Direction for Line Directions

Despite several similar questions and my efforts, there is still no solution so far. Presently, ANSYS gives Directions to Lines on its own which are flipped even for two collinear lines. As a results ...
Rehan Khan's user avatar
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How to calculate the direction of shear stress due to shear force on a circular cross section?

For a circular cross section, we know that the shear stress due to a shear force at the boundary (the radius of the circle) has to be tangent to the curvature. This is so that we have no radial shear ...
GioByte10's user avatar
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Force Required To Stop A Freely Rotating Wheel With Attached Falling Object With A Spring

I have a wheel with a diameter of 2m and a weight of 67kg. The wheel has a radius of gyration of 0.82m. From this wheel a weight of 35kg is suspended. The weight will fall for 10m and accelerate the ...
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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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Why is FEA used for structural analysis?

Is there a reason for using FEA to perform structural analysis over for example Finite volume method for example?
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Finding zero-force members of truss system

My instructor gave the below example for identifying zero force members in truss. The members marked with the green zeros are the zero-force members, according to his solutions. I cannot understand ...
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How would I do stress analysis on a fuselage like this?

This is a frame for an RC plane that I have designed using balsa wood and prefabricated carbon fiber flat bars. It will have a balsa wood skin on the outside, but I have yet to figure out how to ...
bens's user avatar
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When something undergoes angular acceleration (like a bar) how does the distribution of forces look along the bar?

This is something kind of explained with propellers and turbine blades but I'd love some good explanations. Thank you!
Mechs_and_Specs's user avatar
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2D frame analysis by open-source Lua code

There are great apps for 2D frame analysis like the one mentioned here: https://engineering.stackexchange.com/a/50967/15178 I'm just wondering if anyone knows an open-source Lua code for 2D frame ...
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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,...
CrazyFox01's user avatar
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Are "Tresca yield surface" a type of failure mechanism?

A non-rigid solid was given a x-direction point load, and von Mises yield criterion is used to check whether the solid would fail or not. I was also asked: "(the previous question asks us to ...
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Justification for choice of beam stiffness at pinned far-end member

I’m reading off an example provided by the ICE structural analysis book, specifically example 4.7 (moment distribution method) I dont seem to understand why the stiffness from member D-C is 4EI/L ...
EduartR's user avatar
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Beam deflection for FEA model validation

I'm trying to validate an FE model that I'm using by comparing to a simplified analytical solution to the problem. The part I'm analyzing is a lug that is constrained on one end and has a point load ...
Enzo 's user avatar
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Calculating the plastic section modulus, Z, of an arc of a circle

I am trying to find a simplified formula for determining the plastic section modulus, Z, of an arc of a circle. In my case, I have a 20" diameter 0.375" thick pipe and I am cutting a 6" ...
TheSpareBoot's user avatar
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Why does/doesn't this structure qualify as a truss/frame?

I am learning about the basics of truss analysis in mechanics. As part of this, I learnt that a truss/frame is composed of at least 3 members, its joints are pinned and that any loading is applied at ...
Guest3301's user avatar
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Unexpected inconsistency in modelling of load propagation in Icosahedron struts

My intent is to build a program dedicated to analysis of geodesic structures. My proof-of-concept spreadsheet is intended to help me clarify the interactions at each node, so that when I approach the ...
Eric Marceau's user avatar
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Trying to define proof-of-concept for structural analysis of geodesic grid

I would like to create a spreadsheet as a "proof-of-concept" for clarifying the relationships and equations involved in doing the structural analysis of a geodesic dome. I then plan to ...
Eric Marceau's user avatar
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Lateral load calculation at the bottom of an arch

I am trying to find out how much lateral thrust an arch produces when applying a load evenly distributed across its span. There are a lot of 'complex' models around and full analysis done case by case ...
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structural engineering - calculating moment & shear forces for a custom floor mounted hangman's style heavy bag stand?

I own a martial arts facility and I have a few hangman's style (single arm) heavy bag stands that a fabricator friend made for me. These will be used to hang 6' heavybags (100lbs each) attached to a ...
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Ratio of length to baseplate bolt pattern to assume that a joint is pinned

I have a truss tower that is attached to a hoist arm by a baseplate. The truss tower is 80ft long and the bolt pattern of the baseplate is a 1ftx1ft square. Is it valid to assume that the joint ...
Nachiket Adhvaryu's user avatar
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Maximum deflection of PSL + steel beam

I'm an amateur structural engineer, and I'm not understanding how to calculate multi-material beam deflection in my particular scenario. I start with a simply supported PSL (wood) beam that is ...
Sean Suchter's user avatar
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Is there an equivalent of node voltage analysis in mechanical and civil engineering?

When analyzing the behavior of an electrical circuit, the core of the work often involves performing node voltage analysis. This allows you to determine voltage drops and currents of interest in the ...
dmh's user avatar
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How long would it take for the Brooklyn Bridge to collapse if the four main cables were cut where they connect to the ground? [closed]

How much time would the people on the Brooklyn Bridge have to get off if all four main cables failed simultaneously? Are we talking about an immediate collapse the second the cables are severed, or ...
Curious Layman's user avatar
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Finite Element Method for Spherical Objects

I am familiar with the procedure of the FEM for simple planar objects like truss and etc. but my question would be whether it would be possible to use this method to calculate the stiffness or ...
farhad_hep_81's user avatar
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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 ...
Nachiket Adhvaryu's user avatar
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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....
k239430's user avatar
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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 ...
Gary's user avatar
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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 ...
Brian's user avatar
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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/...
Seth's user avatar
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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 ...
SNIreaPER's user avatar
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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-...
VoB's user avatar
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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, ...
SNIreaPER's user avatar
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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. ...
Questor's user avatar
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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 ...
Daerst's user avatar
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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 ...
RocketScience's user avatar
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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 ...
Raymond's user avatar
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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 ...
Megidd's user avatar
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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 ...
SNIreaPER's user avatar
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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 ...
RocketScience's user avatar
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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 ...
Mark Delzer's user avatar
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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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