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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Possible improved approaches to 6mx3m moment-resisting frame with eccentricity+torsion, in advance of detailed engineer discussion
I'm putting a steel frame in, to "open plan" the rear of a brick cavity-wall terrace house in the UK, which will then have a single storey extension added behind it.
I have already retained a ...
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Displacement of Gaussian point after structure simulation
When we did the simulation, we would get deformation and got each nodes displacement.
In physics, it shows the trajectory of a system of particles of the objects.
Is it the same as the displacement ...
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1answer
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defining the dimensions of a bucket elevator chain link
how to define the shape of a heavy duty chain link when the pitch of the chain and the traction load that the chain is subjected to is known?
lets say i consider the traction load as the maximum load ...
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2answers
38 views
Material for car mounted fire extinguisher bracket
Don't try this at home. I am taking personal responsibility for what happens in my car.
Hi all,
I recently purchased a fire extinguisher for my car (it weighs 1.5 lbs or 0.68 kg). I browsed the ...
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1answer
28 views
Calculation of natural frequency in a hinged beam
What I tried: Using the conjugate beam method to find deflection and hence stiffness of the beam, but I am unable to find reactions in the conjugate beam.
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Impact capacity of tension cables, columns and foundations
A rock is falling from an embankment of mass $m_a$ at a height of $h$. Below, a fall protection fence catches the rock, dissipating the energy through tension cables to steel posts and then into ...
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1answer
17 views
Supporting flexible square plate of uniform density in equilibrium with only 4 rolling contacts placed along the square's diagonals
Consider a flexible square of uniform density with vertices (0,0), (0,1), (1,0), (1,1). I need the 4 coordinates for rolling contacts along the diagonals that will stably support it. Someone could ...
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1answer
43 views
How is Load Transferred in a fully supported base
Suppose, you put a point load on a plate that is completely supported. The pressure under this plate is Force divided by the area of the plate.
If I make this base very large, then pressure will be ...
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2answers
73 views
Analizing Vibrations Influence on Dynamic Weighing
I have a very sensitive scale used for dynamic weighing (by dynamic I mean that the scale and load cells are actually beneath a belt conveyor that actively weight product when it´s being transported ...
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1answer
43 views
compression buckling under lateral load
I'm trying to figure out what size of round tube to use for a tensegrity structure that'll probably have people climbing on it.
The rigid elements are 21' steel tubes, and in normal cases they ...
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1answer
54 views
stress/shear analysis of components
I am working on analyzing a few problems, but have not really come across this type of stress concentration problem. Does anyone know where I can study the analysis of this situation?
Pressing ball ...
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1answer
38 views
Stress Tensor decomposition into Compression & Tensile forces
I'm working on a project that does a finite element simulation of a mesh. I can output the stress tensor at each node, but I'm not so sure how to implement failure criteria.
If my material is brittle,...
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2answers
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How to calculate stress in a cylindrical-uniaxial-loaded bar with sudden changes in its diameter
How can I calculate the von Mises stress in the cross-section of a bar like this that is axially loaded?
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STEEL CONNECTIONS
Hi, so, would you consider the connection detailed here as fixed or pinned during your structural analysis?
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1answer
30 views
Portal frame stability
Is there any way a portal frame with pin joints at the top of the columns can be stable? Are portal frames ever done with pin joints at the bases? (Aside from those with raft foundations/combined ...
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Analysis method for two-way slab floor with central column
What method would be appropriate to analyze this concrete structure?
A two-way rectangular concrete slab with walls and central column.
I would like to understand how to model it with either yield ...
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0answers
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Most efficient way for finding the rotation angles after moment distribution (Cross method)?
First of all, I have taken a look at the Grinter's method, which is similar to Cross, but balancing angles instead of moments. My question assumes that we are using the Cross method, and not the ...
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1answer
24 views
Normalizing the compressive stress to a cylinder
I'm not an engineer but a neuroscientist.
I do research in spinal cord injury whereby a clip is used to clamp the spinal cord to induce a bilateral compression injury model.
My research looks at the ...
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1answer
71 views
Stiffness as a function of thickness
Let’s say we have a thin band (made out of PLA, 3D printing material) with a rectangular cross section. In drawing, it would look something like this:
Let’s say a force of 15 N is to be applied from ...
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1answer
87 views
Percentage area of steel for a retaining wall - standard formula doesn't make sense to me?
I'm looking at the usual UK/EU standards formula for the reinforcing steel area percentage, in a retaining wall. Essentially in "usual" cases it comes down to 0.13% of the cross-sectional area of Tw (...
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1answer
57 views
Natural frequency of a column + mass
Consider a system made of a cylindrical column (fixed on the ground) with a mass attached on top of it (B). Both the mass of the column and the mass are not negligible. Depending on the value of the ...
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1answer
76 views
Can secondary beams be supported to columns occaisionally?
If there are secondary beams running between primary beams, and columns support the primary beams, then is it allowable to have the occasional secondary beam pinned to a column? Otherwise it seems to ...
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0answers
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What does 'Analysis Model Value' in NASTRAN optimization mean?
I am new to MSC NASTRAN and PATRAN.
I am running a simulation on composite laminate optimization. While creating the design variables for the study, I noticed that there is a parameter called '...
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2answers
28 views
What is the 'application standard' referred to in EN 1993-1-7
I'm using the Eurocodes for some structural analysis and am looking for the limiting value of deflection of a plate.
EN 1993-1-7, Section 8.2 states:
For limiting values of out of plane deflection w ...
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1answer
52 views
What diameter aluminum pole do I need to lift 100 lbs vertically?
I am wanting to use an aluminum pole (as a Jin Pole) to lift the mast on my sailboat into place. My mast is about 30 ft. long and weighs between 80 – 100 lbs. The aluminum pole would be stood ...
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1answer
53 views
Neutral axis in canteliver beam at support
First, I thought the neutral axis would just be the y bar which can be obtained from the centroid of the cross-section but is different. I have tried letting the net moment at the wall = 0 and the ...
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1answer
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Someone please explain how to get the FAx and FEx because both support are pin.. I only got the FAy and FEy
Can someone explain how to get the Fx for the support A and E
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1answer
67 views
Understanding plastic deformation
Is understanding tensors a prerequisite for understanding plastic deformation (metal forming) equations, plane stress, plane strain conditions, etc..? If so which book should I use to understand ...
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1answer
60 views
FBD of folding table leg
I've drawn an FBD of one leg of the table the picture. I've a feeling I'm missing something. Am I?
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1answer
51 views
Stress analysis for the same configuration but different material
The same geometry and the same free body diagram. However, if we replace the material from steel to glass, for example. How does that influence the analysis?
Two things I think are
1. steel is ...
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1answer
29 views
How to model a UDL over a plate for bending?
If I have a square plate of height h supported along one side (an L-bracket, modeled as fixed support), and there is an evenly distributed force acting over the face of the plate. From load analysis I ...
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53 views
How to create tapered beam in Patran
A hollow cylindrical beam with inner radius is constant and have a varying outer diameter. How can i create this structure using 1-D or 2-D in Patran
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38 views
structural radius for strain evaluation - Propeller Design
What is 'structural radius for strain evaluation' in aircraft propeller design?
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3answers
239 views
Minimum thicknesses of an elliptical cylinder pressure vessel
For pressure vessels in the shape of circular cylinders, we can use $\sigma_{hoop}=\frac{pr}{t}$ to find the minimum skin thickness by setting the hoop stress the maximum allowed value, and then ...
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2answers
63 views
Solar Array Frame Design / Statics Design Problem
I need some help with a statics design problem. I am tasked with designing a solar panel frame to mount on a building and am the only engineer on staff so I don't have anyone else to ask the simple ...
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1answer
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Shear strength polymers
I was looking for some shear strength properties of common polymers/plastics.... I have not found any usefull information yet. I know polymers aren't that linear elastic, but I expected to find some ...
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How to join two beams rigidly?
Hi I am making a beam model using Abaqus. There are two beams created. I wanted to join two beams rigidly in the connection to transfer moments between beams. However, I do not know what connector or ...
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Is it possible to share the results of a static analysis to another static analysis in Ansys?
I am using Ansys R18.2
I have different load cases to analyze on one single structure. Each analysis starts with the structure being loaded and some bolt pretension then the load case diverges in the ...
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1answer
71 views
Strain gauge placement to measure a twisting beam
Where is it best to place a strain gauge to measure the twist of a beam? And what type of gauge is best?
In my application, I have a small metal part which experiences a twisting and bending force. ...
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4answers
194 views
Is there any need to consider loading sequence in construction stage for structure analysis?
Load sequence in phases can be considered applying the self-weight load only to the story added in the appropriate phase.
Assuming that the material will not go into yield stage ( will always be at ...
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How to calculate maximum permitted load from rating factor equation?
I am still fuzzy with this
I have the corroded model in Abaqus, so I have the stress value
and I want to know a maximum permitted load of my bridge model
from this equation
Capacity/load > 1
but I ...
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1answer
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Is it true that if the structure damaged or corroded, the stress will be lower?
I am comparing the stress results between original or non-corroded model to corroded model.
I found that the stress value in non corroded model is lot more bigger than the corroded model,
is it ...
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1answer
40 views
How to calculate residual strength of a corroded structure from their stress values?
Currently, I have an actual entire corroded bridge model in the FEM analysis in Abaqus
I want to estimate the residual strength of this bridge due to corrosion
from the output results in the Abaqus, I ...
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3answers
78 views
Do scaled models reflect strength characteristics of full size
Lets say you want to build a bridge out of carbon fiber. This has never been never been done before, and it's super expensive stuff. So your goal is to use as little material as possible, but ...
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0answers
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Polyurethane tube simulation in Solidworks [closed]
I am doing polyurethane tube simulation in Solidworks Simulation. I am using material PUR for polyurethane already defined in Solidworks. I have a question about the model type to be selected for ...
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1answer
65 views
Should I apply Force or Pressure, Ansys Static Structural
I am working on a project where I must find the maximum principal stresses on an object subjected to impact loading condition. I know the velocity of the object (the one which will hit the test object)...
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3answers
504 views
Transfering moment through internal hinge
My professor says, the internal hinge can not transfer moment:
But can we calculate $\Sigma M_A=0$ for whole beam ( without cutting it or something) this way?:
$\Sigma M_A=0 ===\Rightarrow M_A+(D_y ...
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1answer
120 views
What does 1 x rpm or 2 x rpm or 3 x rpm in vibration analysis mean?
a description for virbation monitoring of industrial bearings states:
peak amplitues at 1 x rpm
should be an indicator for a fault in my case. Can somebody explain me what I have to understand ...
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58 views
Mechanical engineering
I am from electronic field and I have a question regarding solid mechanics.I have to do modeling and analysis of a capacitive sensor under normal force measurement using finite element method. I will ...
