Questions tagged [structural-engineering]

Questions related to the integrity, design requirements, or analysis of structures.

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1answer
25 views

Calculate whether a polycarbonate plate can withstand a certain force

I need to calculate whether a polycarbonate sheet can withstand a certain maximum force. The force is an impact force on any one point of the sheet at any given time. All I have are the Young's ...
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10 views

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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34 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
22 views

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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8 views

How does slope deflection and energy method relate to matrix methods in indeterminate structural analysis

I want to understand the relationship of slope deflection and energy methods to matrix solutions in indeterminate structural analysis. We can apply force (flexibility) or deflection(stiffness) ...
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1answer
19 views

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
23 views

As a metal forming method, how does a rotary swager work?

Rotary swaging is a cold working process, used to reduce the diameter, produce a taper, or add a point to a round workpiece. This can impart internal shapes in hollow workpieces through the use of a ...
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2answers
51 views

basic physics: does pulling on a hook place greater stress on it than passively hanging from it?

Sorry for such a basic question, but it is a safety concern that brings me here: We have a hook installed on the ceiling. From it a rope chair (examples) hangs. Assuming good form and no wild ...
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2answers
38 views

Why is buckling said to be independent of material strength?

In many sources, such as here, it is said that buckling failure is independent of the material's strength. But in many building codes, yield stress of the material is a factor that changes the ...
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8answers
846 views

Definition of buckling as a sudden deformation

On Wikipedia, buckling is defined as follows: In engineering, buckling is the sudden change in shape of a structural component under load such as the bowing of a column under compression or the ...
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3answers
44 views

How common is it to use more than two Rebar rows in a beam (bottom or top rebar)?

I'm programming a drawing plugin for autocad to draw cross-section in beams and ribs. I need to know if it is worth it to add (to my plugin) the feature to add more than two rebar rows, or if I'll be ...
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1answer
25 views

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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3answers
63 views

When an elevator has two buttons next to it, ^ and v, what do they actually mean?

Both as a kid and as an adult, I've encountered elevators lined up next to each other, or single ones, which have two buttons on each floor (outside of the elevator): ...
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1answer
41 views

Why is a paraboloid hyperboloid shape preferred on some structures?

Why is preferred on the construction of big stadium roofs and of cooling towers, per example? What is the advantage of this geometric figure that makes it more economical?
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69 views

How many kWh this turbine would generate?

My grandfather and I are running some experiments down the river, however we don't have expertise in engineering so I bring up this question to the community and hope someone could help. How many kWh ...
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1answer
25 views

Shear flow for unequal leg channel

How does the sine part i.e. $\dfrac{\ell\sin(\theta)}{2}$ appear in the calculation of shear flow ($q$)? I mean, if I'm not mistaken, the sine part is the distance from the x-axis to point D, but how ...
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0answers
19 views

How does one calculate the principial component stresses in an ellipsoidal tank due to head pressure?

I have parameterized the following common bulkhead tank, which has cylindrical walls (easy enough) and ellipsoidal bulkheads. The upper tank is full of a fluid of density 800 kg/m^3 and the lower is ...
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16 views

Is it possible to change geometrics in order to acheive kinematic/dynamic similarity? Scaling an aircraft design

I am trying to scale a general aviation aircraft design. The objective is to increase "useful weight" by 375-400 pounds. Dynamic similitude is the primary goal. Background: I am absolutely in love ...
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0answers
17 views

How are the elastic properties for orthotropic materials ordered?

How are the elastic properties for orthotropic materials ordered? More specifically, orthotropic materials have three axes of symmetry, so what is the conventional ordering of the axes? In more ...
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2answers
82 views

What are these outdoors “mystery boxes” for in the USA?

While watching random videos shot in the USA (in the present time), I've noticed these little weird outdoors boxes: What is the purpose of these? They look like they might be related to ventilation ...
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4answers
804 views

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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1answer
25 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
48 views

Any effect of fire in structural design of buildings?

Do we consider possible effects of fire, when we do structural design for reinforced concrete buildings? But for steel buildings we do? Also for reinforced concrete buildings, the thermal expansion ...
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1answer
30 views

Need Anchors for Pre-cast Concrete Panel with Insulation Inside

I am looking for a solution for mounting a shelf that holds a pressure sprayer to precast Concrete panel with a Foam core insulation sandwiched in the middle. total weight to support is 300 pounds, ...
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0answers
43 views

Is there a standards organization or methodology to determine the elastic material properties of common materials?

Is there a standards organization or methodology to determine the elastic material properties of common materials? What constants are normally used to define these properties? More specifically, the ...
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1answer
46 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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2answers
121 views

How is a 25-year-old can of soda now empty without having been opened or poked?

I just discovered in my parents' basement a Sprite can from 1995* and also a Coca-Cola can probably from the same year. Both cans are unopened and have no visible damage or holes. The Coca-Cola can ...
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0answers
20 views

How can I calculate the shear modulus (Gxy) for the material of a composite laminate [10/-10/-10/10] using test data?

I have the data from a tensile test including axial displacement, force, and strain, as well as E1, E2, Nu12, and Nu21 for the carbon fiber prepreg. I am trying to use this axial data to calculate Gxy ...
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2answers
48 views

Is it feasible to mount a 40kg shelf on a rotating and sliding pole?

I want to build a shelf that can I can place near a wall and still be able to rotate it around 180 degrees. I therefore would want to mount the shelf on a rotating pole and to reduce the needed ...
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0answers
111 views

Double Shear Stress butt joint

A double shear butt joint is shown below in the diagram 4 plates are held together by two bolts. The applied force is 42KN. Determine the shear stress within the joint $$\begin{align} a &= 2 \...
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2answers
495 views

Vocabulary: NYC Elevated Highway & Trains, Industrial Park

I'm writing a story set in NYC and trying to describe certain industrial objects. I'm having trouble with specific technical terms for the items that I've marked w/ arrows. E.g. I don't want to use ...
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2answers
46 views

What is the strongest way to fasten 8020 extrusions in this arrangement?

I am making a project using 10mm aluminum extrusions. I am trying to connect all three extrusions like the picture below shows and I am going to make my own bracket (in red) out of aluminum since the ...
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1answer
30 views

What's the usefulness of maximum stress calculated on Secant's formula for buckling?

For comparison: in Euler's formula, we calculate the critical force such that when the column is subjected to it, it buckles. As far as I understand, the yield strenght of the material doesn't really ...
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2answers
50 views

The design of precast concrete— are they the same with cast-in situ design?

I am curious as to how different is precast concrete design than conventional cast-in situ reinforced concrete design as far as structural engineering is concerned. To my mind, they should be the ...
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0answers
21 views

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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1answer
45 views

Are the design load values in this floor determination table (span chart) inclusive or exclusive of the given floor weight (inherent dead load)?

So, I have been doing research into the use of Insulated Composite Concrete Forms (ICCFs) for small-scale construction, and that has led me to looking at the Rastra ICCF system, as it has been in ...
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1answer
29 views

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
33 views

The best foundation type?

What are the best foundation type for a construction in the city and earthquake prone area? If bored pile foundation is the best, which type is the best, square, circle? what are the considerations of ...
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11 views

Assigning different thicknesses to single part - ABAQUS

I am trying to validate the results of linear analysis from RSTAB (structural analysis tool) with ABAQUS. The model comprises of approximately 800 members. Each member is composed of built-up sections ...
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1answer
21 views

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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2answers
33 views

Where can I find a list of building codes to put on a set of blueprints for a addition

Most architectural companies have a template of blueprints they reuse for every project. As an owner-builder, I need to make these blueprints from scratch On page 1, I have to list all applicable ...
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1answer
72 views

Problem while solving for the moment of a cantilever beam

As in the first image, Moment at any point between C and B should be 0. But when I try to solve it by substituting equal and opposite forces at end C so that anti-clockwise moment of $F(l-a)$ and ...
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0answers
66 views

Problem with cantilever beam and yield strength

Hey, I make a project in which I use a cantilever beam with distributed equal load across the whole beam and I'm using the formulas above to calculate the displacement, moment... My specifications ...
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1answer
48 views

Maximum I-beam girder S12x31.8 span

Does 200lb/in of load on a S12x31.8 over 15 feet seem reasonable? I'm having a tough time trusting the numbers. Two story house with an attic as below. Dotted lines show load bearing walls W1 and W2. ...
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1answer
66 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
31 views

How would I do a buckling analysis with an additional fixed known lateral force?

I am using Nastran for buckling analysis, and I'm new to all of this so please bear with me. For a linear buckling analysis, I understand that you must first apply any compressive load in the static ...
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1answer
32 views

What will be the the width of the column strip in the case of 2 different spans in the same direction?

Say we have a plan of a building as follows and it is required to be designed using DDM (Direct Design Method). since the moment needs to distributed laterally into a column and middle strips and ...
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1answer
36 views

Why is buckling caused by nonlinear geometry?

I've been reading the Comsol post on geometric nonlinearity. The article introduces situations where the small angle approximation and linear analysis of structures gives inaccurate results. For ...
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2answers
52 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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2answers
33 views

What is meant by “perfect geometry” in the context of Euler buckling?

In this question for example (in the first answer) it is said that the Euler critical load formula is unrealistic, because it assumes perfect geometry and perfect alignment of the load. I've found ...

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