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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2
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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.
2
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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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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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1answer
455 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
502 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 ...
4
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3answers
617 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 ...
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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 ...
3
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1answer
893 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
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
253 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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1answer
69 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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0answers
65 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... ...
3
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1answer
442 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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1answer
909 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
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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2answers
3k 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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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 ...
2
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3answers
158 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? ...
0
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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 ...
3
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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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2answers
187 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
1k views

Resolving forces in a simple truss

I'm trying to re-remember how to resolve forces in pin joint frames. I seem to have gotten stuck rather quickly and the examples I've been through don't replicate the same issue. Here is my truss I'm ...
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2answers
653 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 ...
5
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1answer
1k views

What kind of simplified structural system would a Leonardo bridge use?

What kind of simplified structural system would a Leonardo bridge use? I've tried approximating the system to a simple statically determined beam (see below) but our calculations did not give any ...
3
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2answers
810 views

3D problem to 2D plane problem

I have general problem of understanding how forces are transfered from 3d members problem to plane problem. For example what would be 2D representation of forces F1 and F2 acting on horizontal A beam,...
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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
522 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 ...
1
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1answer
353 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....
5
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2answers
462 views

Seeing through walls and noninvasive structural integrity metrics

Walking into a building, how does one find out where the pipes are, how strong the walls are (currently) and other key structural integrity measures? without breaking walls or utilising harmful-to-...
0
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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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0answers
531 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 ...
3
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2answers
827 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 ...
4
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3answers
560 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 ...
1
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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) ...
2
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1answer
121 views

Siding for Industrial Shed: Rain protection vs Ventilation

When building a 12 m tall industrial shed with a peaked roof it is desirable that the sides of the shed should stay open as much as possible for ventilation / safety / access concerns. On the other ...
-1
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1answer
161 views

Mechanism to continously lift grains and put them on a conveyor belt [closed]

I am an electrical engineer, making a hobby project on an automated unwanted-material-removal system in grains and pulses (rice, wheat, etc). I am well versed with programming and electrical stuff, ...
8
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2answers
185 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 ...
10
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1answer
2k views

Where did I go wrong conceptually when attempting to calculate the maximum force on a truss at a given joint?

In the problem statement below, the question states to find the maximum load $\vec{P}$ that the truss can support. My method of approach was: Draw a FBD for the entire structure. Generally I would ...
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1answer
299 views

How to transfer reaction forces of beam to a weld?

I have modeled a beam as fixed-fixed. The reaction forces are -1494 lb.ft and 761 lb (vertical). There is no horizontal reaction. Now I know this beam is welded to another element. I am trying to ...
7
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1answer
2k views

How do you check a weld for applied moment?

I have a single angle connected to a double angle via a 3/16" weld I know there is a factored, applied moment at that connection. I would like to ask how I can go about checking the capacity of this ...
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2answers
1k views

How to calculate a structure's ultimate load [closed]

Sorry in advance if this question is excessively noobish or seems lazy. I have no engineering background and am unsure where to get started tackling this problem. Links to resources that could put me ...
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3answers
4k views

What are safe locations for openings in reinforced concrete beams?

I had an argument with a friend about the safe location for openings in reinforced concrete beams. I've chosen position 1, a little above reinforcement steel, as at this location, the beam is ...
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2answers
164 views

How Do You Determine Truss Stability in a Modeling Program?

This question originates from this and that question. I have realized the concerns boil down to the following figure. Simply put, is the truss above, with the displayed boundary/internal fixity ...
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3answers
1k views

Truss manufacturer drawings unclear

I am currently looking at a set of truss layouts produced by our truss manufacturing partner for a residential building project. I have reason to believe these layouts are generated using Alpine (...
4
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2answers
435 views

Removing beam deflection through axial force

It's been a while since I've done any comprehensive work with structural dynamics, so let me know if I get anything wrong here. I have a horizontal beam that is clamped on one end and free on the ...
4
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1answer
228 views

What is the correct term for long cuts in a floor joist?

I would like to identify the correct term for a long, lateral cut within a floor joist. Based upon this guide and several other sources that I have come across, a ...