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Questions tagged [structural-engineering]

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

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1answer
12 views

What size aluminum beam and cable do I need?

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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0answers
12 views

stiffness factors for symmetrical beam (Moment distribution method) [on hold]

would my stiffness factors for KBC AND KCB be 2EI/L OR 4EI/L ,please see beam below
0
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1answer
22 views

Pressurization Shock vs Slow Pressurization

I've looked through the engineering stackexchange and I'm still perplexed by this. Is it the same to pressurize a vessel extremely fast as oppose to real slowly? Doesn't the shock cause some spike in ...
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2answers
64 views

Rapid Pressurization of closed containment

Will a 2 liters steel pressure vessel with a vent hole 1.5 cm across made for the gas outflow still catastrophically fail if 680 g of gunpowder is detonated in it? Wall thickness: 4 mm Surrounding ...
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0answers
19 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
20 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
20 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
61 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
24 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
16 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
25 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.
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0answers
16 views

How much wide the gate should be? [duplicate]

I have 7 feet wide street in front of my house.How much wide the gate should be. So that a Toyota Corolla car can easily enter to car porch.
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0answers
29 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 ...
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2answers
38 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
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2answers
49 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 ...
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2answers
49 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
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1answer
51 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
38 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
34 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
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2answers
87 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
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1answer
49 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
72 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 ...
1
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1answer
39 views

what actually cause quench cracking ? non-uniform cooling or rapid cooling?

It’s well known that quenching most alloyed steels starting from AISI 4140 to high speed steels in water, brine , or sometimes oil will cause cracking and distortions. in industry oil quenching ...
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2answers
46 views

Structurally sound option for overhead storage platform in garage

I have an RV garage but no RV. I'm considering building a platform 10ft above the floor. The garage is 14 feet tall and the area that I want the platform is 16ft a 16ft. The details are stopping me ...
2
votes
1answer
43 views

How is Load Transferred in a fully supported base

Suppose, you put a point load on a plate that is completely supported. The pressure under this plate is Force divided by the area of the plate. If I make this base very large, then pressure will be ...
3
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0answers
36 views

How to Measure the Unbraced Length of Lateral Torsional Buckling for Negative Moment in W-shape Steel Beam

I have a W-shape steel beam that is fixed-fixed and the top flange is fully braced for lateral torsional buckling. The negative moment at the end controls the design and there is no lateral bracing ...
6
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0answers
57 views

Can high alloy tool steels be quenched in brine?

It is will known that most of tool steels are quenched in oil to prevent cracking and distortion which appears when quenching in water due to non-uniform cooling caused by formation of insulating ...
3
votes
1answer
37 views

Does notching the corner of an angle brace member help or hurt when shear lag is present?

Does notching or cutting out the corner of an angle brace distribute stress better along the flange of a member with shear lag or reduce the stressed edge of the flange's ability to resist deformation?...
2
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0answers
39 views

FEA using abaqus, and it does not follow the trend

I am doing finite element analysis of a donut shape for my school work. I'm increasing the thickness of the object with a 1 mm increment and run FEA each time, and then comparing the maximum ...
1
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0answers
29 views

Removing a post [duplicate]

I have a question about removing a post that is either supporting a beam or the post was there because there was a wall on both sides of my living. please take a look at the photo. There's a house ...
1
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0answers
24 views

Research based bridge project? [closed]

I am a fourth year civil engineering student at IOE pulchowk, Nepal. In our syllabus one practical based curriculum called Project Engineering has been added. I, along with 5 friends, are interested ...
2
votes
1answer
42 views

Is there is vanadium-free high speed steels?

Vanadium is present in all high speed steel grades. unfortunately vanadium not only very expensive but is also a will known cytotoxic metal. some workers get severe persistent cough lasts for months ...
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0answers
29 views

Designing a piston pump for windpump

I am designing a savonius type wind pump for low wind speeds(avg speed = 2.7 m/s), with these speeds and rotor area of about 2 m2. Acc. to my calculations, I am getting a volume flow rate of ...
1
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1answer
40 views

How to introduce the CONSTITUTIVE equation into structure mechanics [closed]

Suppose I have stress and strain relationship and it can be simplified to the equation $\sigma=Function(\epsilon)$. This is the CONSTITUTIVE equation of the material I want to do research. Assume ...
0
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1answer
44 views

compression buckling under lateral load

I'm trying to figure out what size of round tube to use for a tensegrity structure that'll probably have people climbing on it. The rigid elements are 21' steel tubes, and in normal cases they ...
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1answer
45 views

Moment of inertia of rotated area

I know the moment of inertia about X and Y axes. The area has been rotated through an angle theta. How to calculate the moment of inertia about x1 and y1 axes?
1
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1answer
38 views

Stress Tensor decomposition into Compression & Tensile forces

I'm working on a project that does a finite element simulation of a mesh. I can output the stress tensor at each node, but I'm not so sure how to implement failure criteria. If my material is brittle,...
1
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0answers
26 views

STEEL CONNECTIONS

Hi, so, would you consider the connection detailed here as fixed or pinned during your structural analysis?
1
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1answer
30 views

Portal frame stability

Is there any way a portal frame with pin joints at the top of the columns can be stable? Are portal frames ever done with pin joints at the bases? (Aside from those with raft foundations/combined ...
0
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2answers
48 views

Camber Diagram for Steel Girders but not for Concrete Girders

Why is it that, at least in Ontario Canada, camber diagrams are required for detailed design drawings (Not shop drawings) for bridges with steel girders, but are not required for CPCI Girders? My ...
2
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3answers
110 views

Why skyscrapers don't sink into ground?

We shared Mechanics of materials with structural engineers back in college. I learned some basic concept about structural engineering, but besides the basic knowledge i don't know anything about ...
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0answers
20 views

Joint Revolute or Fixed?

a shaft is driven by a motor, it is supported in two places by ball bearings and connected in third place by a motor. how can I use this example in Ansys WB? 1. variant : two places, where the bearing ...
1
vote
0answers
159 views

weight bearing capacity of a reinforced concrete floor slab [closed]

What is the weight bearing capacity per square yard of a 4" monolithic concrete floor slab poured with 3000 psi concrete in 50' x 50' squares, reinforced with 6" x 6" x 10" steel wire mesh, laid over ...
1
vote
1answer
78 views

How thick does my stainless steel table top need to be?

I need to construct a table that will hold a water tank. The filled tank will weigh up to 1300 pounds. I have the table leg frames worked out to hold 2500 pounds so no worries there. (Here is a link ...
2
votes
1answer
37 views

Abaqus Failure for I-Beam Section in Major direction only

For my 4th year dissertation in Civil Engineering I've got to investigate the difference between BS5950, Eurocode 3 and ABAQUS failures. The only thing is, in the BS5950 and Eurocode 3 the failure can ...
0
votes
1answer
69 views

Sizing crumple zone for multi-vehicle collisions

I need to size bumper beams for the crumple zone of a very lightweight vehicle. Together with the driver, the vehicle will weigh 300kg. Sizing the beams for a single-vehicle collision against a ...
0
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2answers
97 views

Distribution of energy absorption in inelastic collision

Object A has mass $m_A$, and is travelling west with velocity $v_A$. Object B has mass $m_B$ and is travelling east with velocity $-v_B$. The objects collide in a perfectly inelastic collision so ...
3
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1answer
50 views

How to convert kN/m² into point loads?

I have a concrete steel ceiling. The calculations show the ceiling is designed for 1,5 kN/m² in addition to it's own weight and traffic loads including snow. So I assume I can hang 1,5 kN/m² from that ...
2
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1answer
24 views

Normalizing the compressive stress to a cylinder

I'm not an engineer but a neuroscientist. I do research in spinal cord injury whereby a clip is used to clamp the spinal cord to induce a bilateral compression injury model. My research looks at the ...
1
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1answer
74 views

How do I calculate how much weight an iron cylinder can support?

I would prefer an equation. The premise is that I'm trying to calculate how thick an iron cylinder using a screw jack would need to be to support 20kg of weight for engineering class. We haven't ...