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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Best support for a granite table top?: Flat bar 316L Stainless Steel or equal box section or unequal box section
firstly, please don't post a technical answer as I will not understand it! Project is outdoor granite topped table. Table legs are two isosceles trapezoids crossed together at 90 degrees, with the ...
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1answer
35 views
Determine Stiffness (k) and Mass (m) of a system from impulse response
I have a test sample (Piezo Diaphragm) which I am actuating with a voltage supplied to the sample to assess the impulse response.
When this voltage is supplied to the sample a deformation per unit ...
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1answer
56 views
Correct axial force distribution between pinned ends of a member?
I have a planar member pinned at both ends with compressive axial loads at 1/3 and 2/3rd position of 14.4 applied between them. Is the following axial force distribution correct? Shouldn't the section ...
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1answer
50 views
compression buckling of frame
all. The top beam is subjected to uniformly distributed load. FYI, the column is 5m in length. As you can see, the major axis of column is connected to the beam with moment connection on top. However,...
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1answer
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How strong is this spring compressor?
Disclaimer: amateur mechanic, not an engineer of any kind.
I just bought a spring compressor for my car. It's the factory recommended type so I'm assuming it's strong enough, but I'm wondering exactly ...
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3answers
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Estimating dynamic load from human body
I want to build myself a pull-up bar. I am confident enough that I can guesstimate how much material I need for it to be strong enough, but this time I would like to challenge myself to properly ...
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2answers
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Can I convert multiple point loads into a single uniform distributed load?
I have a beam that has a given limit of 1690 lbs uniform load for a 24" span. I will be subjecting this beam to multiple point loads at different locations on the beam. In order to determine if ...
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3answers
36 views
Product picking carts
Does anyone know why product picking carts like this, commonly found in warehouses and supermarkets, are mostly just 3 or 4 shelves high?
Is it because of ergonomic issues or mechanical ones? Couldn'...
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1answer
39 views
deformable object squeezing
I have the problem following. There is a deformable sphere with radius r. It goes inside a constriction channel with d*d cross section. Assuming that the sphere volume is constant and the sphere shape ...
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1answer
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how can i find Spectral Acceleration (Sa(T1; 5%))?
I want to do incremental dynamic analysis (IDA) for my project and for hunt and fill algorithm i need the 5% damped Spectral Acceleration at the structure’s first-mode period (Sa(T1; 5%)) . Can i find ...
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correcting mode shape for modal damping
I have mode shapes and eigen frequencies from FE simulation. I have modal matrix and eigen frequencies corresponding to each mode. The mode shape is mass normalized. I am required to correct each ...
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1answer
43 views
Question in finding the direction of forces in a truss
This question primarily involves finding the direction of forces in a truss.
Let's give a scenario in Method of Joints
One source I found says that in finding the direction of the source, it would be ...
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1answer
24 views
How to determine the fixed end moment?
I was trying to compute the fixed end moment for the beam (given below) using equilibrium equation for x, y displacement and moment but there are 4 unknown variables reaction and moment at both ends ...
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1answer
39 views
Reinforce foldable table legs
I'm trying to build a table with 4 swivel legs that can be locked into arbitrary angles so that it can stand over one to three rows of storage crates in my garage:
As you can see, the legs aren't ...
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33 views
Program name of this buckling modeling
My instructor sent this solving with program that I don’t know the name , does anyone know the name of the program ?
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2answers
33 views
How effective are screen protectors?
Screen protectors are supposed to protect your devices from nicks and scratches, as well as the stress of impacts which might otherwise lead to cracks or shattering. The fundamental principle behind ...
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4answers
69 views
Bending moment calculation
Considering all the variables are the same, how to rank these connections from highest to lowest bending moment?
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1answer
22 views
Where does the equation for shear stress of a rectangular beam (3/2 V/A) come from?
I am writing a report and need to reference every equation used. I am using the equation for shear stress in a rectangular beam of
tau = 3/2 * V/A
but am not sure where it came from or what textbook ...
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1answer
25 views
Elasticity values in stiffness matrix?
Stiffness, k, is defined by
$$k=\frac{Force}{deformation}$$
if you insert this into formula
$deformation = \frac{\text{Force}\times\text{ Length}}{AE}$
you get
$$k=\frac{A.E}{L}$$
where E is ...
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1answer
45 views
Stress Concentration Factor – Why a Specific Range?
I was trying to find the stress concentration factor for a specific situation and I found two different resources for it.
Ref: Shigley's mechanical engineering design
Ref: Roark's Formulas for ...
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1answer
42 views
unbraced length of the compression portion of a long member
I am designing a truss. the bottom chord in the first two panels at each end or at the supports are in compression and the rest of the bottom chord is in tension. there is no lateral bracing along the ...
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0answers
23 views
Help sizing of lug attachment flange/plate?
Apologies for the crude drawing attached, but here goes. Given Fx, Fy, and Fz loads applied at the lug hole, I've distributed the loading into each of the 6 fasteners to size them. I've also sized the ...
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1answer
40 views
Linear Motion Stage with Offset Loading Problem
I'm currently developing a linear motion system which will have to withstand a large offset load (see image below). There will be two rails, each with a carriage on, which will be connected by a beam/...
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Finite element welding simulation with commercial software? [closed]
I am looking forward some libraries/add-ons to perform welding simulation (thermomechanical coupling, steel alloys) using commercial software, like Ansys or Abaqus. My aim is to determine better ...
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1answer
33 views
Mesh generation in FEM [duplicate]
When a frame structure is analyzed using a FEM computer software, does the program still generate mesh, even as a line mesh, on frame members, or we must do it ourselves?
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1answer
44 views
Modeling the structure vs FEM
When you model the structure to be analyzed with a structural analysis program, indicating the beam elements, shell elements, nodes, rigid links etc... The analysis is still called Finite Element ...
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3answers
84 views
Buckling of Parallel rods
I am trying to calculate critical force $P$, if two rods (same diameter and length - rigid fiberglass sandwiched on two steel plates) are parallel to each other.
$$
P = \frac{\pi^2 EI}{(KL)^2}
$$
I ...
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1answer
74 views
Bending of an L-shaped beam
First post so bear with me:
I am designing a frame for a press, which needs to be able to withstand 250 N. I am planning to make the frame an L-shaped beam, turned around. With a side view, it will ...
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1answer
71 views
Distribution of Forces into 3D Bolt Group
I'm trying to create an Excel spreadsheet that takes a 3D bolt group with x y and z coordinates, applied loading, and determines the distribution of forces into each bolt based on weighting by the ...
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1answer
52 views
How to solve this displacement problem
I have to solve this question, and I've tried multiple things with the angle and displacement but I just cannot figure it out.
I started with a M/EI diagram and i went from there.
Any tips on how to ...
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1answer
45 views
Optimal placement of two support points along a wooden beam
Assuming a beam that is supported at 2 points as per attached image, what would be Lc (length center) and Lo (length overhang) for maximum strength. (or load bearing capability)
For actual material ...
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80 views
What is the amount of force that will cause failure?
What is the amount of force required to cause the beam to deflect, shear or otherwise fail?
The force would be generated by a hydraulic piston. Let's
call those units PSI. The piston will be mounted ...
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1answer
34 views
Does having a basement level increase overall earthquake resistance of a high rise building?
Does having a basement level increase overall earthquake resistance of a high rise building? Does it also lessen the burden on pile foundations?
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1answer
43 views
Stress Concentration: Hole in infinite thin plate loaded in biaxial tension vs biaxial compression
Is there a difference in the stress concentration of a hole in an infinite thin plate loaded in biaxial tension vs biaxial compression?
I ask because in numerous books (one of them in the screenshot ...
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0answers
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Should I use ST or LT values for extruded rod?
In MMPDS for AA7075-73511 (extruded rod) the Table 3.7.10.0(g3) show both ST and LT values for transverse directions. For a rod with circular cross section there is really no Short and Long transverse ...
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2answers
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Other than yielding, what type of stress you check for ASD?
ASIC 360-16, in page pdf 330, it says
"For any single element, there may be a number of different allowable stresses that must be checked."
I can think of yielding. What else?
Rupture for ...
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1answer
88 views
Question on the determinacy of frame structures
I have been working on a program to solve frame problems, and I have used the following formula for determining whether a frame is statically determinate:
$$RD=3m + r-3j-s,$$
where:
$m$ is the number ...
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1answer
58 views
Single shear bolt shear force and moment diagrams
I’m trying to determine what the shear and moment diagrams of a bolt in single shear look like. Before anyone says it, I know that it’s rare that a bolt will ever fail first in bending, and this is ...
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2answers
107 views
Unable to obtain closed system of equations using method of joints
I am currently working on some code to solve 2-dimensional truss and frame problems, and I have come into an issue with one of the problems. I need to come up with a system of linear equations that I ...
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1answer
211 views
Analysis Of Braced Frame By Hand Calculation
Suppose we have a rigid jointed, statically indeterminate frame with bracing as shown below:
Note: there would also be a distributed lateral load along at least one side of the structure and all ...
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1answer
64 views
What is the meaning of “load case consistent” in stress analysis terms?
I’m a (junior) stress engineer and have been tasked with sizing a lug. Various loadcases have been run through FEM and loads have been distributed into the lug bolt for each. In other words, each ...
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2answers
467 views
What is the significance of hinge in the internal structure of the beam?
I had come across a question on shear force and bending moment diagram where a cantilever beam with a roller support at point C is given and the portion beyond point C in overhang. Does this hinge act ...
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2answers
47 views
How do fiber optic sensors detect strains in a structure?
I am working on a project on detecting damage in structures using fiber optic sensors. I read the paper Structural Health Monitoring in Composite Structures by Fiber-Optic Sensors and found out that ...
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1answer
41 views
Stress Analysis University Report Help
I'm working on a final report for the mechanics of material course, and the project was to choose a structure or mechanical element and carry out stress analysis using solidworks and then confirm ...
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1answer
50 views
Degree of Freedoms in a Node of a 3D Frame/Beam Element
I recently took a quiz for my Matrix Methods of Structural Analysis Class, in which I encountered the following MCQ. My answer of '6' was justified, in my opinion, by the size of the stiffness matrix ...
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1answer
52 views
Solving for stiffness matrix numerically by a set of measurements
Is it in general possible when you have a mechanical structure (in this case I am referring to the structure in this post) and you want to determine the global stiffness matrix of this structure, to ...
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1answer
50 views
Missing items in geotechnical reports [closed]
In your experience, what items that should be in geotechnical reports are sometimes missing, and what do you do in that case, can you provide example? Do we look at codes or make best guess and based ...
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1answer
47 views
Structural design approaches ASD or LRFD
I have several questions regarding terminology as I get confused reading different sources.
What I learned so far:
ASD is also called WSD (working stress design)
LRFD is also called Limit State ...
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2answers
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Representing slabs in FEM
When making structural analysis with FEM, do we normally use plate or shell elements to represent slabs? I checked and did some reading for the difference between shell and plate elements in FEM in ...
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1answer
202 views
Bending behavior of built-up C-Channel
I am analyzing a built-up C-channel for bending purposes (2 point loads of 1200 N each @ 30 cm symmetrically from the CL). The flanges are made of a different material than the web, they are also of a ...
