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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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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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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Point load acting on a table, determine the dimensions of the table legs [closed]

A square table with 4 legs are subjected to a point load of 1000 N at its geometric center at its top. Determine the dimensions of 4 legs of the table. This is a question asked on a number of ...
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An indeterminate beam with two spring attachments [closed]

So I need to solve this question using stiffness matrix method. But I am really confused about the springs.
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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
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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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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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31 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
28 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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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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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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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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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 ...
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Wind load vs Earthquake load and R factor

I read somewhere that if for instance for a building earthquake forces are expected to be much higher than wind loads, we can increase the R (response modification factor) value, so that we bring down ...
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Cybertruck Monocoque body design

For those of you who are following the development of the Cybertruck, the latest modification is a size reduction of the body by 3%. Assuming this is dimensionally and not by volume, do you think this ...
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37 views

Which would be the most rigid?

I'm trying to resolve a theoretical problem. If I have 2 steel boxes made from the same gauge steel (3mm stainless steel) & one is 7 meters by 2 meters by 2 meters & the other is say 30% ...
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What is the difference between base shear and pseudo lateral load in seismic analysis of buildings?

What is the difference between base shear and pseudo lateral load in seismic analysis of buildings or are they the same?
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How to make the earthquake response spectrum graph

As far as I understand, there are two ways to make the earthquake response spectrum graph. One by experiment with a set of oscillators with different periods, to which we apply the earthquake's time ...
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42 views

Plastic hinge locations in pushover analysis

In pushover analysis, why do we force the plastic hinge locations, such as indicating in our model instead of waiting for them to occur naturally? Also, do we usually need to show the spread of ...
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names of some earthquake analysis methods

For structure earthquake analysis methods, do these all below mean the same thing, just ways of calling it differently? Linear Response History Analysis Linear Elastic Time History Analysis Linear ...
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Modal Response Spectrum analysis

Is "Modal Response Spectrum Analysis" the same as response spectrum analysis? How about modal superposition analysis? This is the same or different? Or all are same?
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Earthquake time history analysis

Time history analysis of earthquakes for structures, is a NON-LINEAR dynamic method correct? Then why is there also something called "LINEAR response history analysis"? What is the difference of this ...
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Provide stability for a 3D object with a support structure

This is a follow-up to this question. I wonder if structural engineering tools like Finite Element etc. might help create such support structures. If so, how?
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1answer
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How is response spectrum result used for earthquake analysis

For simpler buildings we can use response spectrum analysis. How is this used? The maximum acceleration we get from this , is simply multiplied by the mass of the building to get F=ma , total ...
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In structural analysis, does inelastic analyis mean the same thing as non linear analysis?

In structural analysis, does inelastic analyis mean EXACTLY the same thing as non linear analysis? If not what is the difference?
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What arrangement of web members is better? [duplicate]

I have a problem regarding following two structures. First one: Second one: What arrangemet is better ? Why ? Actually I have no idea which one is better.
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How does virtual work method relate to matrix method or FEM in structural analysis?

I understand the relationship of force method and displacement method and how we use them in matrices in FEM. How about virtual work? Is it used in matrices and FEM too?
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1answer
48 views

Analysis Of Statically Indeterminate Structures By Hand

When double-checking/confirming results produced by structural analysis software, many engineers recommend verifying and spot-checking key or critical members if the entire structure is not analysed. ...
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1answer
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Which method is better to solve indeterminate trusses, force or displacement method?

For statically indeterminate trusses, which method is better? Force or displacement method? And why? I read somewhere that displacement method is not suitable for trusses but I must verify.
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Is shock spectrum always obtained for an undamped single degree of freedom system?

I am reading a textbook on fundamentals of vibrations and it has a very brief introduction to shock spectra. It mentions that For comparison purposes, it is customary to use the response of an ...
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1answer
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Structural Analysis of a TV Mount

I have a simple wall mount I want to analyze using hand calculations (pure beam bending if possible) that looks like this: I want to be able to model it as if it was in a state of pure bending with a ...
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4answers
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What is the maximum angle of a shelf angled brace?

So suppose I want to make a single shelf protruding from a wall and to place a heavy object on it (Figure 1). A shelf like this would fail (assuming no internal mounting that penetrates into the wall)....
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28 views

column yielding under earthquake

In the buildings designed with strong column weak beam concept, the columns will remain elastic, their plastic deformation will be limited. but this is not true at the base of the building. i mean i ...
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2answers
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Bending moment in Euler-Bernoulli finite Element

I'm trying to calculate the bending moment distribution on a fixed-fixed Euler-Bernoulli beam. It is known that interelement nodes show different values for the bending moment. What is customary to do ...
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1answer
52 views

Is it safe to slightly cut the edge of RCC column for passage of pipe in bathroom?

The RCC column was cut in my absence due to passage of pipe for bathroom fittings. The thickness is about 1.5 in. Will it hamper the stability of structure?
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In Nastran, how to ignore fatal error due to failed convergence and move on to next subcase?

At the moment the whole analysis stops when 1 subcase fails to converge. How can I keep the analysis going such that all subcases are are run, even if they all might produce an error? I'm pretty sure ...
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In a nonlinear static two-step subcase, why does the load step decrease after the first step?

I am using MSC Nastran for nonlinear static analysis (sol 400). Step 1 contains a small perturbation load laterally on a thin-walled cylinder. Step 2 contains a very large compressive load. ...
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Elastic waves in very thin plate

Elastic waves in structural elements are described by \begin{align} \rho \frac{\partial^2 u}{\partial t^2} &= (2 \mu + \lambda) \frac{\partial^2 u}{\partial x^2} + \mu \left( \frac{\partial^2 ...
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1answer
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For arc-length method in nastran, how to analyse post-buckling behaviour with load decrease

I am currently trying to model the buckling behaviour of a cylinder using sol 400 nonlinear static analysis using Nastran. I am using the arc-length (modified Riks) method as apparently it can ...
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1answer
45 views

Understanding Bending and Twisting Moments in a Plate

I am trying to understand Kirchoff Plate Theory and I am unable to understand the difference between bending and twisting moment for a plate. In a beam structure, if moment is along the axis of the ...
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1answer
129 views

Free pre-processor for Nastran?

I want to do a non-linear analysis (possibly SOL 400) on Nastran. I used PyNastran (python module) to set-up the BDF file for a Linear buckling analysis (sol 105). However I feel like it might be too ...
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1answer
25 views

Determining If A Test Article Is Suitable For X RAY Following Shock Testing?

I am interested in putting a small (3"x3"x2") assembly under X-ray, following a shock test, in order to evaluate failures of an internal ceramic piece. Unfortunately, this assembly utilizes quite a ...
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131 views

Could a bolt this size actually be used on a project?

could there ever be a structure that would require something like this?
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57 views

Deflection In Multistory Structure

When analysing and designing a structure for the serviceability limit state the deflections of each beam must be found. When considering a multistory rigid jointed structure (as below) and applying ...
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1answer
49 views

Failure modes of a zimmer frame

I've been asked to modify an existing zimmer/walking frame for a tall person. Bashing the bits of metal is the easy bit, just use tube to make longer legs to replace the original short removable ...
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Finding reactions of a continuous beam

is it possible to find all the support reactions of this continuous beam using fourth order equation without using principle of superposition?
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54 views

Designing PVC structure

I am an electrical engineering student that wishes I could have taken some civil engineering courses. Anyways I'm trying to design a pvc structure that I will use as a somewhat complicated room ...
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28 views

Predict egg drop outcome in random container

What elements affect the outcome of a raw egg drop in a random container? I’ve considered friction, mass, size of container, size and type of padding. Are there other elements?
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Truss analysis of internal forces in members

I am trying to calculate the internal forces and their nature in this truss, however, I cannot seem to do so as both the method of joint and the method of section do not work. I think this is because ...
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1answer
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Beam with internal hinge - Reactions help

can someone explain why the highlighted area (at Mb=0) is - 5x2 and not positive? Since the rest of the loads(and the rest of that very same load) pointing down were documented with a +, I dont ...

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