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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Mounting outdoors camera using aluminum 5052
I designed a simple U shape 2mm sheet metal bent mount for a 4kg outdoors CCTV camera. The mount was accidentally produced from 5052-H32 Aluminum instead of 6061-T6.
Is it common to use 5052 ...
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1answer
57 views
2D- Truss Member Analysis
I am a graduate student trying to sharpen the direct stiffness method skills. However, I am stuck at the beginning.
The problem is given in the image.
Can someone help me to write down all the nodal ...
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17 views
Determining the minimal needed wall thickness between two bores in a control block
Given a control block of simplicity with only two bores. These two bores could be parallel or just could be very close to each other at a specific point in the control block.
The material of the ...
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1answer
39 views
Orthogonal to Orthoradial reinforcement
Most of finite element calculations are performed with an orthogonal mesh (Cartesian coordinate system). From this calculation, we get two values of required steel area per linear meter: $Ax, Ay$ ($cm^...
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29 views
Consequences of Inextensibility of an in-plane line in Euler-Bernoulli Beam Theory
The Euler-Bernoulli beam theory is based on the hypothesis that the beam deforms such that a straight line normal to the beam axis before deformation remains
inextensible
straight
normal to the beam ...
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36 views
Structural Analysis of an RC plane in flight
I am working on structural analysis of an RC plane in a symmetrical maneuver. There are two types of loads on the structure a) aerodynamic loads and b) inertial loads.
I have determined the ...
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1answer
54 views
Second Order Elastic Analysis
When analysing a structure using traditional methods (e.g. Hardy Cross, Slope Deflection, Force Method, etc.), it is a first-order elastic analysis. My question is, how would one analyse a statically ...
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3answers
29 views
Maximum spans in multi-level building
Is it possible to build a building with 3 levels, with the 2nd and 3rd levels having areas with clear spans (no columns) of 130 ft length and 85 feet width? There can be columns outside of this clear ...
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0answers
50 views
How to compare two acceleration sensors side-by-side?
I have a single axis analog capacitive acceleration sensor (from PCB Piezotronics) which is very reliable but expensive. Now I need more axis, unfortunately can not afford buying anymore. So I have ...
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1answer
51 views
Modification of Beam Equation for Thin Sheet
I am trying to determine the modulus of elasticity (Young's Modulus) for a rigid paper sheet. The issue I am having is that my results for the Young's Modulus change depending on what orientation (...
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81 views
Deflection Of Beam In Structural Rigid Jointed Frame
This is a recommended follow on to one of my previous questions. It was stated that I could find the deflections of a beam by idealising it as a simply supported beam and then calculating accordingly. ...
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1answer
59 views
Deflections Of Statically Indeterminate Structures
When analysing and then designing a rigid jointed, statically indeterminate structure, I can solve for all the forces and moments using the Hardy Cross (Moment Distribution) Method.
However, I am ...
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2answers
48 views
Determination of Young's Modulus for use in Analysis
I am writing a finite element code for my final year project of BS Mechanical Engineering. The geometry is an integration of several parts composed of different materials. I don't have exact values of ...
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1answer
47 views
Concept on two-force member
I have some homework question that i require some help understanding.
1) For the first question highlighted in red (referring to diagram viii), I know for sure that reactions at the supports is ...
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0answers
35 views
Analysis Of Planar Frame Using Hardy Cross Method (Moment Distribution) With Sway
The image shown below is a sketch of the structure/frame that I am attempting to analyse using the Hardy Cross (Moment Distribution) Method. I need to find the bending moments, axial forces and shear ...
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2answers
56 views
Pin joint system displacement question
A pinned system comprising bars of the same material and cross-sectional area is subjected to a vertical load P.
I am required to form a relationship between FAB and P.
The first part of the ...
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2answers
153 views
Can a speedbump safeguard a pipeline located below?
Recently I noticed a concrete speed bumper created near my parking. On enquiring the purpose, the committee who took the decision told me that the purpose of the bumper is to safeguard an existing ...
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1answer
43 views
How do I calculate the compressive strength of a wall?
I literally just have a thin steel wall that stands vertically with a load on top. The thin edges of the wall are oriented vertically with the load applied on top of the top thin edge, with the large ...
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1answer
40 views
Is Belytschko beam defined for 3D or 2D?
from the paper in this link , which is the Belytscko beam. I could not figure out if it is a 3D beam or a 2D one.
if you don't have access to that paper, please check the page 73 on this link.
what ...
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53 views
How deep do you have to check for problems underneath a building site?
When you're putting up a new building, you have to check the soil underneath for stability. How deep do you typically have to check? What's the extent of your "due diligence" when ensuring that a ...
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1answer
47 views
Aluminum tube vs steel
Our question is what size and alloy aluminum tube can be used to replace steel tube in a vertical load application. Our current spec is 1.5” OD STD steel tubing 7 feet long. We will use 6 poles ...
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2answers
71 views
Design a part to straighten moment and reduce torsion
I have a configuration with two bolts and a point of force application (see figure).
I understand that, if perfectly rigid, the two parts depicted in the figure will behave identically in how they ...
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1answer
39 views
Ball and Socket Wheel Concept
I am sure you all remember those prehistoric computer mouses that had a ball under it. I'm looking for any points and tips on how to create a ball and socket wheel that has an almost frictionless ...
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1answer
37 views
Self Weight in Moment Distribution (Hardy Cross)
When applying the moment distribution method also known as the Hardy Cross method, how do I take into account the self-weight of columns? In the case of the beams, I can just apply the weight load ...
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3answers
97 views
Structure analysis
I am currently designing a setup for an experiment which involves loading a weight to its extension arm, and by design this structure is not bolted to any surface so its free to move. I need to ...
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2answers
126 views
Can a crisscrossed metallic skeleton resist earthquakes for buildings?
To follow up with my previous question on the seismic design of buildings, I would like to ask if it makes sense to support buildings with strong thick 'crisscrossed' metallic frames.
I have the ...
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1answer
65 views
Analysis of Machine Frames With Cut Outs
I have a structure that is used to support two shafts which are carrying relatively high loads. It is composed of two columns and a "shaft supporting block" in the centre (almost acting as a beam). ...
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1answer
34 views
Dependency between load capacity for reinforced concrete slab and thickness
How does the load capacity for a reinforced concrete slab depend on the thickness of the slab?
Example:
Let's suppose that we have the following constants:
concrete quality (including the maximum ...
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2answers
39 views
Parallel Axis Theorem for x and y Shift
I have a quick question about the parallel axis theorem.
Let's say I have a box-like object rotated about the following pivot point
I was wondering, by applying the parallel axis theorem, would the ...
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3answers
55 views
Why not a reverse bending in the slab?
When I'm looking at images / videos about the load supported by reinforced concrete slabs, I always see a compression at the top of the slab in every point that varies from the center to the edges:
...
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1answer
91 views
Looking to design a cantilever support to hold up an 80kg projector
I need to make a support (preferably metal) for a projector to be fixed on the wall. The projector size is:
Width: 0.7m
Length: 1.1m
Weight: 80kg
If anyone knows how i can solve this please let me ...
2
votes
2answers
69 views
Can a horizontal foundation safeguard against earthquakes?
I have not taken any course in civil engineering. What I was taught was that a broad base would prevent something from toppling. So it makes me wondering instead of nailing the foundation of a ...
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1answer
29 views
Stopping Force of Irregularly Shaped Object
I have a quick question about the force needed to accelerate/decelerate an irregular object.
Lets say I have a 3D object with the following general shape,
This system is in general a gripper (gray) ...
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1answer
130 views
How to derive fixed-end moment of a beam?
Here is my attempt but I am not getting the right answer. Can someone tell me what I am doing wrong?
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91 views
Why is pure shear a “shear”?
If one looks up the meaning of shear strain, most sources talk about this situation:
That is, a force acts along a surface of an element at it is elongated, turning a rectangle into a rhombus. ...
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1answer
52 views
How is the stress concentration factor calculated in FEM?
I have written my own finite element code for a linear elastic (plane stress) problem consisting of a plate with a circular hole in the middle, fixed on one side, having a tensile force acting on the ...
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0answers
87 views
Machine Frame Design
How do I select the cross section for a machine frame? Do I need to refer to the AISC steel construction manual to find the capacity of beams, columns, etc?
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1answer
83 views
Engine Combustion Cylinder Wall Thickness
Been referencing this website for some time but now need to seek specific help. I am not an engineering student but rather a DIY hack who loves engineering and machining neither of which I am ...
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0answers
29 views
Constrained optimization using Lagrangian
I'm trying to optimize the weight of a truss with the constraint that the trusses don't face more stress than the material resistance.
Here is a sketch of my truss:
I have a Python function that ...
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1answer
30 views
Structural analysis + thermal expansion using ANSYS static module
I am attempting to model a steel sample subjected to combined mechanical and thermal loading. The thermal loading can be quite elevated, where reduction in the elastic modulus will occur.
Does anyone ...
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3answers
100 views
How do I calculate the member forces of a truss when external force acts on the member (not joint)?
Given a three member truss structure shown here:
How do I find the vertical and horizontal displacements at M?
Assume all members are elastic and E,A, I and constant.
I start with finding the ...
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0answers
24 views
Etabs Semi Rigid Diaphragms
In Etabs, if I model a building with semi-rigid diaphragms assigned to the floors, the floors will now transfer gravity loads when default meshing is assigned (as compared to rigid diaphragms ...
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1answer
24 views
Selection of Aluminum (or steel) tubing dimension based on uniform load on supported beam
I am installing shades on a section of deck. The shade will be made of sections of fabric (which will let some wind through), but I assume a solid section.
Dimensions are 3.5ft*4ft = 14ft^2 = 1.3m^2
...
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1answer
30 views
2D Solid - Axisimmetric - Missing properties and material
Goodmorning,
I'm trying to understand how 2D solid elements work. I want to study the local buckling of a simple aluminium pipe with thin walls.
From what I understood, I can use 2D solid elements ...
2
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1answer
175 views
Maximum tensile and compressive stress in a T-beam
Where does the T-beam come from? There's just a straight beam resting on two supports. And where do 10 and 80 come from? I am so confused.
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1answer
72 views
Determining the direction of internal forces in a truss
I am learning the method of joints, but there's no explanation on how to figure out the direction of internal forces in my course.
How do you know that BA is tension and BC is compression?
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0answers
45 views
How to state the PSD value (random vibration)
In random vibration analysis, the load is given as a PSD (power spectral density). The values are often $G^2/Hz$, but I have an example where the PSD is a pressure $Pa^2/Hz$. The value is written as $(...
1
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1answer
47 views
FEA: What is the difference between a spider of RBE2s and multiple SPCs
I am not sure what the difference is between using a spider of RBE2s. and multiple SPCs across a face. I've heard that the spider is the more accurate method as multiple SPCs make the model overly ...
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1answer
70 views
How to find the diameter of bolts in a flanged joint?
So I'm given this question with the following diagram:
Two sections of a pipe are joined in a flanged joint as shown in the Figure below. The difference in pressure from interior to exterior is 2 MPa....
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2answers
53 views
What equation are we using to describe forces in FEA?
Engineers often use Finite Element Analysis software to solve for stresses inside complicated structures to generate pictures like the one above.
I am familiar with FEA as a method to solve ...
