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Questions tagged [structures]

Questions relating to or the engineering application of a device that must withstand a loading via deflection, stresses, resistance to buckling, or natural frequencies.

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Trying to shed some weight on my design, any thoughts?

I am trying to design a lifting mechanism and I would love some insight/opinions as to how I can shed some weight off it. The current weight I have for my mechanism is 187.5kg, however, this is ...
gunter's user avatar
  • 321
1 vote
2 answers
120 views

Stress yield of a specimen, result confusion

I am trying to calculate the static yield stress of a specimen using the 0.2% offset line on a stress strain curve. I found the static yield stress of the specimen to be the number in bold (104.1239). ...
gunter's user avatar
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1 vote
0 answers
79 views

Calculating the Structural Forces Required to Support a Robot on an Overhanging Beam

this is my first time posting on here and I have a question regarding the structural properties a beam will need in order to fulfill some requirements we have for our robotics team. The scenario is as ...
Jonah Rolfness's user avatar
3 votes
1 answer
723 views

Determining σxx on a 3d system with resolved forces (stress, strain, shear strain energy)

I am having trouble conceptualizing this problem. I have attempted it but am confused about a few things, I would highly appreciate any insight or advice for this. I know you need to resolve P into ...
gunter's user avatar
  • 321
3 votes
1 answer
961 views

Caulculating maximum shear stress at certain points

I have a structures problem I cannot solve, I have the answer and I have attempted the question. I just need to know where I am going off track. Any assistance would be highly appreciated. My work is ...
gunter's user avatar
  • 321
1 vote
1 answer
1k views

Determine the strain energy of a bar

I have a Structures question about determining strain energy that I am unable to solve. I have attempted it and I have the answer, I would appreciate if if someone can just tell me where I am going ...
gunter's user avatar
  • 321
3 votes
1 answer
14k views

What is the effective depth of a beam with two layers of tension reinforcement?

In EC2 for calculating crack width and deflection, does the effective depth d refers to the depth from compression face to centroid of the tension reinforcement or is that calculated to the centroid ...
Jennifer's user avatar
2 votes
2 answers
6k views

Transfer of moments in beams with internal hinges

We have a beam with 1 internal hinge just like the picture. We know the internal hinge can not transfer moments between AB and BD. We know the 30 kN force makes some moments on BD & AB. If B (...
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3 votes
0 answers
107 views

Normal stress - shear stress pairs not lying on Mohrs' Circles

The three Mohr's circles depict all the possible normal stress / shear stress combinations when material is taken and rotated along one of it's axes of principal stress. Nevertheless, it is clear that ...
Bruno KM's user avatar
  • 131
1 vote
0 answers
563 views

Beam element stiffness matrix for variable area cross section with mass and shear center not coinciding

I would like to find the full (12 by 12) Timoshenko beam element stiffness matrix for a variable cross section with mass center axis and elastic center does not coincide. I have the full stiffness ...
Paul Thomas's user avatar
1 vote
0 answers
84 views

How to design a shelving unit out of McMaster Carr Struts? [closed]

I apologize for the complete beginner question. I'm an Undergraduate Research Assistant trying to design a shelving 8'tall by 10' Long, 4' wide shelving unit to support about 200 lbs. I'm designing ...
BJC's user avatar
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1 vote
2 answers
55 views

How much ballast is required in 110 mph winds to stabilize: a 60 lb., 20’ pole; 3' below ground/17’ above ground, with a 24lb. wind turbine atop it?

I can’t seem to find an answer that doesn’t involve more than a ton and a half of concrete. The manual for the wind turbine reports that the load on the turbine in a 110 mph wind is only 155 ...
James Stephen Du Bois's user avatar
0 votes
2 answers
319 views

Why we don't use fillets while making buildings?

Why don't we use fillets when making buildings and houses (i.e why do we leave the edges sharp?)? Does stress concentration factor not matter in making structures? I am talking about the building ...
meditat's user avatar
  • 119
1 vote
0 answers
37 views

How to support height extender on a rail?

I've got an 1/8" thick steel rail with 1.5" diameter and 15' in length sitting on two 5/32" thick steel rails with 2.5" diameter and 100" in length 14' apart: I want to add a diagonal support for a ...
This could be more creative's user avatar
3 votes
1 answer
241 views

How to structurally bind bamboo stems for loads?

I would like to begin a case study in structural design using bamboo, which has currently become available to me. The design instance I would like to structurally copy is the Rogue RM-6 "Monster Rack" ...
user avatar
4 votes
1 answer
190 views

3D construction [closed]

Can someone please tell you what to start with to construct a Kids Bike Trailer as 3D. It should select material and geometry. I think I should start sketching with forces (children's weight) and ...
Zouhir Bensebban's user avatar
4 votes
1 answer
4k views

What is the advantage of statically indeterminate structures?

Most of the real life structures are statically indeterminate. What is the benefit of designing a statically indeterminate structure instead of a statically determinate one? I don't mean only beams ...
veronika's user avatar
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1 vote
0 answers
54 views

Column Buckling: Which is more useful to plot; Buckling Load vs Slender Ratio, or, Stress vs Slender Ratio [closed]

Both have a linear relationship, is there any merit in plotting one over the other?
Cyrus Wyett's user avatar
1 vote
0 answers
46 views

Check of a nominaly pinned steel joint

I am interested how to check a nominally pined joint. Especially how to check its rotational capacity and whether i can define it as nominally pinned in structural fem model. I understand that there ...
Tomas L's user avatar
  • 11
2 votes
1 answer
880 views

Percentage error in calculated Forces during simple structural analysis for a truss pin-jointed strucures

I am currently trying to design a simple truss (pin-jointed) structure able to withstand a 1.2 kN load. I carried all the analysis and found the forces, stresses and strains in the members. My ...
Cyril_engineeringSE's user avatar
1 vote
0 answers
32 views

How to calculate a global strain from a field disitribution

For an arbitrary articulated structure subject to non-affine (non homogeneous) deformations, the components of the strain tensor are defined locally. Is there a way to calculate a numerical strain ...
GeoArt's user avatar
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1 vote
2 answers
392 views

Conveyor Truss Analysis Problem with loading

I've been working on a schematic and its been going beyond my comprehension; so i thought i should consult better structural engineers here. (I'm a fresh Civil Engr Graduate though) i have this ...
olyboy16's user avatar
-1 votes
2 answers
332 views

Iron Prince Rupert's drop [closed]

I'm wondering if molten iron was hurled into outer space if it might create a shape similar to a Prince Rupert's drop. Like, say, if a star had finally exhausted it's fuel and exploded.
Michael Pecorino's user avatar
-2 votes
1 answer
71 views

HELP Please! Depth of member

What is meant by "depth of member" and what is the formula of it? Can I use it in moment of inertia formula? How to use the given information to answer the question? and Thank you.
user avatar
3 votes
1 answer
312 views

How can I absorb shock on an existing steel structure?

I'm currently trying to extend the shock-absorbing capabilities of a welded steel structure that is shown in the following image. It is a structure that supports a slat conveyor. A load is to fall ...
gsolorzanop's user avatar
0 votes
2 answers
11k views

how to solve internal hinge problem with loading given on hinge [closed]

how to solve internal hinge problem with loading given on hinge
deb's user avatar
  • 9
2 votes
2 answers
2k views

Projected area in hoop's stress structural mechanics

While calculating hoop's stress we consider projected area. Infact in bearing stress from pins in a truss something similar is applicable.Can you explain why we are taking something like this instead ...
Rajorshi Koyal's user avatar
0 votes
1 answer
284 views

What lining design holds better for a tunnel? Spiral lining or cylindrical lining?

Hy everyone :) I don't know much about structural engineering, maybe spiral lining and cylindrical lining are not the proper ...
AIon's user avatar
  • 157
2 votes
1 answer
536 views

How to calculate bending of shell

I'm an electrical engineer, so please bear with me :). I came across this situation and I tried to find some equations to solve it, but all I could find was some Finite Element Theory, and I was ...
Penguin_123's user avatar
1 vote
2 answers
95 views

How to find strain in an inclined member of a struss

I'm working through an FEA problem and I'm stuck. Question: How can I determine the strain in member 3 from displacements known at node 3? It's at 45 degrees, I know I should be using some $cos\...
Nathan Lowe's user avatar
1 vote
0 answers
34 views

Pressure-volume relation of thin-walled shell [closed]

Attempt to edit into a more specific question as suggested by moderator: I would like define the shape and material properties of a 3D thin-walled shell/membrane-like structure (for instance a baloon)...
user301448's user avatar
2 votes
1 answer
54 views

Acoustic transmission through houseboat hulls

The short version is: should I be worried about bass transmission through water into my neighbors' hulls? I am renovating a small houseboat (12x30 ft) to live on. It is one large room, and I plan on ...
NauticalN's user avatar
3 votes
1 answer
106 views

Translating the name of a type of beam from Russian to English

I am trying to translate the name of a special kind of beam from a set of Russian-language drawings. The dictionary translates the name as simply supported beam, but it's not that simple. There is a ...
Vladimir Markiev's user avatar
1 vote
1 answer
7k views

How to find the reaction forces, moments and the displacement of the fixed beam with a link?

The beam is fixed on both ends and there is a link in the middle. There is a force F on the link. My approach to solve this problem: A free body diagram is cut at the link and made into 2 systems. ...
gorobo's user avatar
  • 11
3 votes
3 answers
303 views

Is there a specific name for diagonally braced truss members like those on the Queensboro Bridge?

I am wondering about this specific type of truss in particular, any links to further source information and images regarding this particular geometry would be much appreciated.
user11193's user avatar
2 votes
1 answer
96 views

is a cylindrical pylon just as sturdy as a cubical one of the same volume?

I'm wondering if the structural integrity of a solid cylindrical pylon is just as sturdy as a cubical one of the same volume given that they're both the same height.
1971chevycamaro's user avatar
2 votes
1 answer
105 views

Expressing Derivative of Cable Tension Component

I am looking at Hibbeler's section on a `Cable Subjected to a Distributed Load' in Engineering Mechanics - Statics, Ed13, as shown in the attached images. I am getting stuck deriving equation (7-7). ...
James Izzard's user avatar
3 votes
3 answers
116 views

choice of steel plate for simple application

I am an occasional hobbyist "DIYer" (not an engineer) who needs help choosing a steel plate for a small home improvement project: I will use it to create a 20" circle, suspended from a bolt at the ...
lara michaels's user avatar
1 vote
1 answer
1k views

Reaction forces in a structure

I have the following structure, in which I am failing to calculate the two reactions: Cz (apparently vertical) and Dz, in the roller support of the beam. The beam length is 7.5 m, the reactions Az, Cx,...
Algon Janer's user avatar
0 votes
1 answer
1k views

Glass Facade Load on edge of slab?

How do i calculate the load of a glass facade and is it placed uniformly on the edge of the slab or should i place a point load on each edge of the panel of the facade? And Can anyone give me a link ...
J.Daou's user avatar
  • 503
4 votes
3 answers
1k views

How to calculate indeterminacy of pin-jointed frame?

I understand that to calculate the indeterminacy of a pin-jointed frame, the unknowns have to be considered i.e. the number of elements corresponding to the number of internal forces, plus the number ...
simplytheaverage's user avatar
1 vote
2 answers
4k views

Two storey brick building without using wood or steel

Is it possible to build a two storey building just using bricks (no wooden beams, steel beams or steel reinforcement) to suspend the floor of the second storey? I'm aware that using wooden beams is ...
Homunculus Reticulli's user avatar
3 votes
1 answer
2k views

Torsional Constant of Thin-Walled Multi-Cell Structures

I'm asked to analytically calculate the composite torsional constant of the following structure. No other information is given, such as the applied torque. I know how to calculate the torsional ...
anonymouse's user avatar
1 vote
2 answers
923 views

Steel Continuous Beam Structural Diagram

Here's an image of my structural plan that my group and I are designing for a university assignment. It is a 7-story steel structure with bracing at the two ends and at the verticle core near the ...
Jess's user avatar
  • 11
2 votes
4 answers
2k views

What loads does the safety factor apply for?

As is well known, a safety factor is often applied for engineering structures as a measure of precaution. I would like to ask for which loads (if not all) does the safety factor apply for. For ...
aerodokuu's user avatar
1 vote
1 answer
372 views

What is the logic to solve this cantilever problem?

I solved it using the logic that the vertical link of the beam is basically there to make the beam act like a cantilever. So I think it is a cantilever problem. Therefore, $$EI\frac{d^2y}{dx^2}=-px=M$...
Vinay5forPrime's user avatar
0 votes
1 answer
95 views

Vertical Linear Actuator Sway Movement

I'm designing something with a vertical linear actuator. It is a quite large actuator lifting a load. I'm anticipating sway from the actuator as it moves up and down so I'm creating a support ...
Dana's user avatar
  • 3
1 vote
0 answers
98 views

How should I position two shelf supports for the minimum deflection? [duplicate]

The above is the shelf that I'm intending to put up. It will have two symmetrically placed supports. This is probably a simple question that really should be answered in all DIY shops but... ...
Paul Uszak's user avatar
3 votes
1 answer
636 views

Does the use of the catenary in an inverted weight model imply a more solid structure?

I am studying Gaudí and how does he created some of his work. I found that he used inverted weight models (as the shown in the picture below) to recreate the catenary. In many articles it is pointed ...
Kevin Mamaqi's user avatar
1 vote
1 answer
9k views

How much weight can this stand hold?

I got this stand from a friend of mine years ago. Its unbranded. I want to use it to hold a 55 gallon fish tank which can weigh about 456 pounds to 622.5 pounds. How can i calculate a estimate of how ...
srp009's user avatar
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