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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0answers
37 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 ...
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0answers
26 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 ...
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2answers
72 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\...
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1answer
917 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 ...
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2answers
210 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.
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1answer
180 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 ...
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1answer
50 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.
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2answers
7k views
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2answers
916 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 ...
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1answer
219 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 ...
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3answers
101 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 ...
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0answers
33 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)...
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1answer
50 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 ...
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1answer
95 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 ...
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1answer
460 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,...
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1answer
78 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.
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3answers
102 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.
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1answer
85 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). ...
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2answers
192 views

How to calculate rotations from displacements?

I'm trying to develop a finite conical shell element with six dof at each node. I want to express the rotations $\phi$, $\theta$ and $\psi$ in terms of the displacements $u$, $v$ and $w$. The ...
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2answers
2k views

What is the practical limit on the number of storeys in residential buildings built with monolithic reinforced concrete?

I have recently bought a flat in a 25-storey building. I wonder what is the practical limit for the number of storeys in a mass-produced residential buildings built from monolithic reinforced concrete?...
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1answer
522 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 ...
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2answers
3k 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 ...
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1answer
70 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 ...
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2answers
695 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 ...
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4answers
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 ...
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1answer
260 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$...
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3answers
160 views

Base or foundation?

Please help, what is the correct term for: The bottom/foot part of building or structure which carries loads from the building/structure and transfers the loads to the soil/earth/ground beneath it? ...
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2answers
8k views

Steel Structure connection pin or fixed

For the connection above, I think that once the beam is loaded, their is no room for rotation of the beam. But as per British Standard this is a pinned connection. So I have been trying to determine ...
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0answers
66 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... ...
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1answer
460 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 ...
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1answer
6k 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 ...
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2answers
224 views

How do I build a miniature concrete house?

Our teacher gave us a project before Christmas break, it was to build a miniature house, she didn't state what specific materials should be used, so I built a cardboard house. She didn't accept it ...
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1answer
918 views

Critical Buckling Load for a Spring Supported Bar

The above is a past exam question from an introductory structural analysis course, one in which although we have studied the Euler buckling load equation, we have just been given parameters for the ...
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2answers
4k views

Rectangular hollow section vs square hollow section [closed]

Which is better to use in contructing ceiling frame? RHS or SHS? And why?
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2answers
8k views

How to calculate deflection of a simple beam with a load in the center?

Given this type of arrangement: - image by Hermanoere Where the beam is of rectangular cross-section. I am specifically thinking of a wooden beam where I can look up some material characteristics (...
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1answer
4k views

How to calculate effective section modulus of a slender section?

Hi how to calculate the effective section modulus of a class 4 section using Eurocode 1993? Can someone show me an example? I tried searching online but cannot find anything useful. My main problem is ...
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2answers
1k views

Given the tensile strength of a rod, how do you calculate the max weight that can be hung from it?

Given a 3.25" long, 0.125" diameter rubber rod with tensile strength 1200 psi supported on both ends, how much weight can you hung from the middle of it without breaking it? (This is not homework I am ...
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1answer
52 views

How are these components called? [closed]

I need to build a structure like the one in the picture below. Basically, it is a pendulum that holds a measurement hammer and lets it oscillate without friction. I don't know how to find the two ...
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2answers
665 views

Maximum deflection of a beam, fixed in one end and concetrated load at free end [closed]

A 2 m long beam fixed in one side with a 2000 kg concentrated load at free end. Profile of the beam is HEB100 material S235. I would like to know if the beam will break under this load. If ...
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1answer
16k views

What angle - for a strut - provides the greatest vertical strength/support for a cantilever?

I want to affix a cantilever to wall. I will support the other end of the cantilever with a strut made of wood, that attaches to some point on the wall below the cantilever, as shown in this sketch (...
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1answer
81 views

Positions of Max Load a human would exert on horizontal rods of such a system by positioning leverage & bodyweight?

My mechanical & civil engineering usage is gone as the last time I did that was in Freshman year & my major went in another direction, but I've tried to be as thorough as possible using a ...
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2answers
528 views

How do I fabricate a sphere? [closed]

I'm want to make a 2 meters wide sphere that should be circular enough as a giant hamster ball! I could make it of some sort of strong plastic or steel. It should have a hatch on top that can be ...
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2answers
126 views

Could this garage door's bowing be caused by someone falling into it? [closed]

The tension spring broke on our garage door causing it to fall. Afterward, the garage looked as it does in the pictures below. The most straightforward explanation to me is that the impact of the fall ...
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1answer
357 views

Calculate mobile base weight to support adjustable arm

I want to calculate how heavy a mobile hydraulic post table base must be to support an adjustable monitor arm and monitor. Monitor (iMac) Specs: Height: 20.3 inches (51.6 cm) Width: 25.6 inches (65....
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1answer
361 views

Hinge joint for flat panels that can also flex horizontally?

I have to design a science display board consisting of 20 panels 2m x 2m high and wide, which can fold up as a giant pamphlet. The difficulty is how to load and unload them from a lorry in less than ...
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2answers
828 views

How do the columns in the 'magic mountains' sculpture stay up?

I am reading this story on artist Ugo Rondinone's sculpture in the Nevada desert (Building an Artist’s ‘Magic Mountains’ to Draw Visitors to the Desert) and simply wondering (as an artist myself): how ...
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2answers
186 views

Vertical wave action on bridge

Rio de Janeiro, Brazil is currently stunned by the fact that yesterday a span of a brand new (innaugurated in January) bicycle bridge along the coast collapsed when struck by a wave, killing some ...
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0answers
536 views

Suitable tube materials for making a light-weight, heavy-load bearing structure [closed]

I am looking to build a detachable hammock stand structure for camping. I was originally thinking about making one out of PVC but I am in the UK and it isn’t cost effective as it looks like it needs ...
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3answers
567 views

Why would a column expand before accepting load through a narrow thunk?

Here's a column top which holds a driveway overbridge. The column is a reinforced concrete cylinder with an inverse truncated cone on top - so it expands sideways at its top. The column top holds ...
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1answer
171 views

Heuristics for Efficient Structure (Shed) Design

Are there any heuristics / thumb-rules to evaluate whether a shed-structure has been efficiently designed? To be specific, I have an industrial shed, 12 m tall, 270 m2 floor area (longest span 10 m) ...