Questions tagged [structural-engineering]
Questions related to the integrity, design requirements, or analysis of structures.
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2answers
23 views
Is a 1/8" AR400F steel plate strong enough, for 4,000 lbs?
I have a Ford F350 cab & chassis and a gooseneck trailer. For the gooseneck hitch I want to use a steel plate.
The steel plate will be BOLTED to the frame, above the rear axle And the gooseneck ...
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0answers
16 views
About method of work and Energy or Clapeyron theorem
I'm having some difficulty to understand the work and Energy method (aka Clapeyron theorem), especially with different loads.
Could you please help me to fix this problem, because I found different ...
3
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3answers
78 views
What are the possible implications of the heating of the structural stonework of Notre-Dame cathedral during the fire?
Yesterday, Notre Dame cathedral caught fire. The roof and the central spire were destroyed and some of the stonework was subjected to high temperatures for an extended period.
What are the likely ...
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0answers
33 views
Two Way Concrete slab decision [closed]
I am looking for two way concrete slab design , LX = 5.5 m, LY=6.71 M
Concrete grade M20, Fy= 415, depth of slab 100 mm , cover 20 mm, live load on slab 3kn/m2, use 12 dia hysd bars both direction, ...
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0answers
23 views
Determination of Warping Function for Thin-walled Multi-cellular Beams
I am trying to find warping function $\mathcal{T}$ for a thin-walled multi-cellular beam. There are four rectangular cells. The governing differential equation for $\mathcal{T}$ is Eq. 8.98 as shown ...
6
votes
1answer
75 views
What is the umbrella-like thing surrounding this new structure?
Recently this water tank was constructed (poured concrete). (I presume it is a water tank, as they laid blue plastic/PVC water pipe, perhaps 24 in. dia., in the vicinity at the same time.) After the ...
0
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0answers
33 views
Traction Force or Reaction Force
I am doing an FEA of a link plate of a chain drive system. the plate is subjected to traction force at one pin joint this particular link is in contact with the sprocket. it is also in contact with ...
0
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0answers
23 views
Static balancing of link mechanism
So I'm trying to get to the condition as shown in the picture below, where it says that if we have zero free length springs and k1r2=k2r1, then any configuration (pose) of the link is in equilibrium. ...
3
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2answers
194 views
Strength of face-nailed connection for stair steps
I'm building a loft ladder with alternating-tread steps. The stringers are 2x6 White Spruce, and I'm hoping to build the steps out of the same material.
The span for the steps is 21". Code requires ...
0
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0answers
21 views
How to calculate *minimum* length of base/return required to stabilize an angled vertical?
Trying to design a stable jewelry display. What is the formula to calculate minimum length of base/return required to stabilize an angled vertical rectangle? Or (because that formula is undoubtedly ...
0
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2answers
58 views
Why not build container ships from plastic?
This may sound crazy but bear with me. I was thinking about why cargo ships are built from such heavy material as steel, while smaller boats are often made of plastics. I know cargo ships carry a lot ...
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0answers
18 views
Can I use fixed support for a frame?
Can we use fixed support at columns in a frame?
Because If we do so , there will be 2 moments when we will cut the section.
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1answer
31 views
Shock/Isolation mounting under tension
I want to secure a box (roughly 20kg in total) that contains electronic equipment to the underside of a flat steel structure. We can weld onto the underside.
The steel structure has a high chance of ...
1
vote
1answer
46 views
Can a plate under bending be designed using its plastic section modulus?
I am designing an end plate connection. My lecture notes show its bending capacity is calculated using elastic section modulus. For class 1 I-beams, we can use its plastic section modulus. I wonder ...
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0answers
30 views
Need help with FEA bar analysis problem
I'm trying to solve this
which is to find the total deformation of the bar.
I'm trying to implement the finite element approach, but I am getting way too large of numbers. Here is what I did in ...
0
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1answer
28 views
Aluminum tube frame to support 2300 lbs water tank
I want to build an aluminum tube frame strong enough to support a 2300 lbs water tank. The dimensions of the frame would be 28 " wide, 72" long and 16 inches tall.
My intention is to use 2" x 2", 1/8 ...
6
votes
1answer
43 views
Should the corbel angle always be estimated as 60 degrees in masonry construction, or is there a formula to use instead?
In educational construction material as well as engineering publications, the corbel angle for significant excess loads, and also for substantial openings, in an ordinary brick wall is usually ...
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0answers
26 views
Why would a SMD (spring mass damper) model of steel break down?
Under what conditions would steel be able to be modelled as a 3D SMD model, and under what conditions would the model break down?
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2answers
55 views
Rotational and translation DoFs in structural mechanics
I'm a computational person, and I don't quite understand how rotational DoFs are manifested in the linear elasticity equations. I understand the translational DoFs are simply the displacement ...
2
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2answers
50 views
Need Help to Remove Sway from Steel Post + Glass Panels
I have spanned ~15' with 2x 10mm tempered glass panels. They're connected in the middle with a 1.5" x 1.5" 16-gauge, 316 stainless steel post filled with concrete. This post has a 316 base welded on ...
2
votes
1answer
74 views
Which way of joining is stronger?
I have to build a box to extend the length of a projector bracket:
The projector bracket weighs 7kg and has an arm of about 500mm. The projector weighs another 5kg.
The box has a depth of 140mm. ...
1
vote
1answer
27 views
Member weight in a planar truss?
So I'm given a question in which a Truck drives over a pratt truss bridge. In the question the truss is in 3D.
I'm given:
1)The loads from each axle of the truck
2)The weight of each member in the ...
1
vote
2answers
61 views
The internal normal force, shear force and moment
How do I determine the internal normal force, shear force and moment at the point C?
$V_c = 0$, $N_c = 0$ and $M_c=3.75 kN/m$
I have already done this:
Where is the problem?
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2answers
37 views
How can I keep a free spinning range finder pointing down?
I have a rod mounted inside of a 2x4 that is allowed to freely spin inside of its hole. Attached to that rod's head is a range finder. I want the rod to reliably point down at the ground at all times ...
2
votes
2answers
39 views
Exact anlytical solution for beam-lifting problem constrained by crane capacity
I have been trying to calculate the analytical solution for the following problem but have not succeeded to reach an exact solution. Can anyone propose a way?
A concrete beam is to be lifted by two ...
1
vote
2answers
44 views
Direction of the resultant force in hinge supports
In my lecture material on different types of structural supports, there is the above picture of a hinge. It is explained that a hinge is a type of support that exerts no moment on the rod, but ...
0
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1answer
55 views
Regarding design of fixation of a part
I would like to know if there is any theory behind designing the fixation for any part. To optimise the number of mounting holes and fasteners.
If so what is it called and where can I get it?
Please ...
0
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0answers
23 views
Boundary conditions for cantilever beam
I would like to ask about boundary conditions of a cantilever beam with a transverse point (in y dir) load at tip.
According to equilibrium equations;
We have a normal stress in x direction due to ...
0
votes
1answer
84 views
Is a granite block tunnel longer lasting than reinforced concrete? [closed]
Assumptions
Building Process exists
Waterproofing is able to be replaced
Notes
Please answer yes or no with the science backing.
This question is only about the strength and lifespan.
This ...
0
votes
2answers
43 views
Shear force and bending moment for continuous span
It's given that L1 = 5m, L2 and L3= 7.5m, w = 8.9kN/m , I am asked to find the bending moment using these coefficient.. Prior to this , i need to have the value of shear force first.Shear force = ...
2
votes
1answer
37 views
Stress strain curve [duplicate]
According to uniaxial stress strain curve, specimen fails at a certain stress value since necking begins.
My question is that, same stress value appears before necking especially around yield point ...
0
votes
2answers
67 views
Does pressurization speed affect the tensile stress in the vessel wall
Does it matter whether you pressurize a vessel from zero to 4000 psi in 40 millisecond or 10 hours? Will that affect the response of the tank wall in terms of the tensile stress in the wall during or ...
0
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1answer
43 views
What size aluminum beam and cable do I need? [closed]
I am building a small project at work and need to figure out what size beam I need. I am basically building a wall mounted jib crane. The beam will be anchored to a wall on one end and will have a ...
0
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1answer
47 views
Is the combination of blocks and lines in this old, very long telescope an implementation of some named structure or technique?
Below are two cropped views of "Johannes Hevelius's 8 inch telescope with an open work wood and wire "tube" that had a focal length of 150 feet to limit chromatic aberration." from Harvard University, ...
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0answers
28 views
Possible improved approaches to 6mx3m moment-resisting frame with eccentricity+torsion, in advance of detailed engineer discussion
I'm putting a steel frame in, to "open plan" the rear of a brick cavity-wall terrace house in the UK, which will then have a single storey extension added behind it.
I have already retained a ...
0
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1answer
50 views
Shape Functions of beam element with 3 nodes (quadratic element)
For a two node beam element there are four shape functions for four degree of freedom:
For a straight three node beam element how shape functions are?
Please note that beam is straight and not ...
0
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1answer
66 views
When freezing rain brings down power lines, is it usually because the power lines have too little slack?
I did the math and figured out that according to the laws of physics, for any specific type of wire between poles a given distance apart, the more slack the wire has, the less its weight between those ...
0
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1answer
46 views
defining the dimensions of a bucket elevator chain link
how to define the shape of a heavy duty chain link when the pitch of the chain and the traction load that the chain is subjected to is known?
lets say i consider the traction load as the maximum load ...
0
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1answer
21 views
Big Beam LVL or Glu Lam load capacity to support a gymnast
I need help knowing if I am selecting the correct wood beam.
The load will be all near the center and a 250 pound man will be doing pull ups on it. I would estimate a 1,000 pound dynamic load to be ...
0
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1answer
35 views
Finding good and effective solution for overhead RCC slab spalling due to corrosion in Rebars [closed]
Please suggest some effective repair solution for spalling overhead slab due to high corrosion in rebars.
4
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0answers
36 views
What approaches are there for demolishing a structure and how is an approach chosen?
From my office on the 21st floor of a building in Vancouver, BC two parking garages in the process of being demolished are visible. A third is just out of view a few more blocks away.
One of these ...
0
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2answers
41 views
Material for car mounted fire extinguisher bracket
Don't try this at home. I am taking personal responsibility for what happens in my car.
Hi all,
I recently purchased a fire extinguisher for my car (it weighs 1.5 lbs or 0.68 kg). I browsed the ...
1
vote
2answers
58 views
Factors favoring crack propagation in the middle of a plate for an extensive length relative to plate thickness (Reasons for < marks on crack surface)
I have a scenario where we have encountered a cracked steel plate where the crack has propagated within the plate longitudinally for an extensive length. The plate thickness is 1", and the crack ...
-1
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2answers
51 views
Impact capacity of tension cables, columns and foundations
A rock is falling from an embankment of mass $m_a$ at a height of $h$. Below, a fall protection fence catches the rock, dissipating the energy through tension cables to steel posts and then into ...
2
votes
1answer
54 views
How to perform SLS check with strut-and-tie method?
I am using strut-and-tie method to design a corbel. I noticed that Eurocode mentions strut-and-tie only in section 6, which is ultimate limit state design. How do I perform serviceability limit state ...
0
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1answer
40 views
stress in X- and Y-direction
A steel parallelepiped with a square cross-section fits exactly into the cavity.
it's loaded from the top surface(see picture).
how can I calculate the stress in X- and Y-direction if the strain in X- ...
0
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1answer
41 views
Does tunnel lining made of cast iron tubings actually accept all the mechanical loads?
Here goes a recently opened underground railway station in Moscow, Russian Federation (image is from here)
On the left is an undecorated (just painted and it will likely remain this way) tunnel wall. ...
3
votes
2answers
91 views
How does one build a waterproof basement?
I have been doing a bunch of research online into how to build a basement that is below the water table. The common wisdom is to "not waste the money doing that" but as someone who doesn't like to be ...
1
vote
1answer
54 views
Recommendations on a rigid connection between materials
I am trying to construct a torsion pendulum/balance for a physics experiment but the research papers are always missing specifics on how the certain connections are made.
I am looking for ...
1
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0answers
77 views
designing bridge problem
My problem is a bridge with a horizontal cord of span 12 m between two piers of arbitrary height. It is required to use a pin-connected truss, consisting of steel members bolted together to steel ...
