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Questions tagged [structural-engineering]

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

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74 views

Not solvable question civil engineering

They didn’t give me the radius of the wheel where external force F is acting . How can I calculate the reactions at A,B . When they didn’t give me the radius . Is this question “ Wrong “ ? Note ...
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18 views

Swim platform supports

I have a swim platform on the back of my boat that extends 24” from the transom. It is supported by 5- 1” diameter stainless steel arms that are attached To the transom 13” below the platform and at 2”...
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1answer
33 views

Mounting outdoors camera using aluminum 5052

I designed a simple U shape 2mm sheet metal bent mount for a 4kg outdoors CCTV camera. The mount was accidentally produced from 5052-H32 Aluminum instead of 6061-T6. Is it common to use 5052 ...
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26 views

Horizontal flanged connection in an atmospheric container

I have a round container that is open to the atmosphere. Vertical flanges see the hoop stress from the content as main tension force. We typically have Dead Load, content, Wind and Seismic loads. ...
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2answers
25 views

How to keep a symmetric-lens-shaped object upright using only wire?

Given a lens-shaped frame with a single crossbar running parallel to the floor, how could we keep that object upright and stable on one of its endpoints using only wire? The shape I'm describing is ...
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34 views

Why are parts of a cylinder closer to centre elongated less during torsion?

Say we have a fixed cylinder with a radius of $R$. Looking at any cross-section, the shear stress at a radius ($r$) is given by $\tau = G \gamma $. I understand that the particles at the outer radius ...
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28 views

1m3 water container and ice damage prevention

I was looking for data on ice resistance for these kinds of 1000 litres containers. I believe they are made of polyethylene with an outside aluminium structure. Given the physics of ice expansion, ...
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36 views

what means Probablity of event excedence of so many years

I like to know about occurrence of earthquake events when we say that earthquake of 0.5 g will occur in 50 years in excedence of.
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2answers
28 views

Does the quality of a microphone affect the frequency and intensity(dB) of the sound it can pick up?

Does the quality of a microphone affect the frequency and intensity(dB) of the sound it can pick up? Do all microphones pick up sound as it is in real life?
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2answers
33 views

What type of engineer/professional designs hydroponic farms?

What kind of professional/architect/engineer builds agricultural systems, specifically automated hydroponic systems? Things such as growing, cultivation, lighting, plumbing, harvesting, processing ...
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1answer
39 views

Orthogonal to Orthoradial reinforcement

Most of finite element calculations are performed with an orthogonal mesh (Cartesian coordinate system). From this calculation, we get two values of required steel area per linear meter: $Ax, Ay$ ($cm^...
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36 views

Structural Analysis of an RC plane in flight

I am working on structural analysis of an RC plane in a symmetrical maneuver. There are two types of loads on the structure a) aerodynamic loads and b) inertial loads. I have determined the ...
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1answer
54 views

Second Order Elastic Analysis

When analysing a structure using traditional methods (e.g. Hardy Cross, Slope Deflection, Force Method, etc.), it is a first-order elastic analysis. My question is, how would one analyse a statically ...
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29 views

Maximum spans in multi-level building

Is it possible to build a building with 3 levels, with the 2nd and 3rd levels having areas with clear spans (no columns) of 130 ft length and 85 feet width? There can be columns outside of this clear ...
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26 views

What is the difference between $K$ ,$K_{IC}$ and $K_t$?

I have seen three representation of stress concentration factor values $K$,$K_{IC}$ and $K_t$ now all that I know is $_I$ in suffix represents opening mode of crack.The suffix $t$ stands for tip....
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1answer
32 views

Double-bagging problem: which bag on the inside?

If you're double-bagging some groceries, and one of the bags has tears in it while the other is intact, which bag should go on the inside?
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21 views

How to install a doorway through a stone wall where a barrel ceiling is on one side

We have an old stone built cottage. We have a garage we are converting to a bathroom. The garage roof is a barrel brick ceiling. We need to break through from the house to the garage but need to ...
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81 views

Deflection Of Beam In Structural Rigid Jointed Frame

This is a recommended follow on to one of my previous questions. It was stated that I could find the deflections of a beam by idealising it as a simply supported beam and then calculating accordingly. ...
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1answer
59 views

Deflections Of Statically Indeterminate Structures

When analysing and then designing a rigid jointed, statically indeterminate structure, I can solve for all the forces and moments using the Hardy Cross (Moment Distribution) Method. However, I am ...
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2answers
48 views

Determination of Young's Modulus for use in Analysis

I am writing a finite element code for my final year project of BS Mechanical Engineering. The geometry is an integration of several parts composed of different materials. I don't have exact values of ...
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1answer
47 views

Concept on two-force member

I have some homework question that i require some help understanding. 1) For the first question highlighted in red (referring to diagram viii), I know for sure that reactions at the supports is ...
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24 views

Rolling U shape profile [duplicate]

My plan is bending sheet metal as curved u profile using rolling machine something like motorcycle and or trucks fenders. Is it possible ?and how?
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1answer
71 views

How to form steel truck fenders [closed]

I want to set up steel truck fenders production line, but have no idea how to do that. Something like this picture. Edit1: I have two plans to form final curved shape , using a hydraulic press or ...
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1answer
39 views

Assessment of steel beam for lifting to Eurocode 3

A client wishes to use an existing steel beam to lift a 1 tonne load using a sling. The 3 m long beam is measured as UB 203x133 visually observed at both ends to be secure with end-plates with all ...
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1answer
39 views

Plate thickness for repair of completely corroded web

The web of a H-section column has been completely corroded at the air-moisture interface with the concrete encasement leaving a hole in the web. The proposal is to break out the existing concrete and ...
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2answers
48 views

is there a formula to determine if a structure will topple over

as a child all of us have built a tower out of Lego. we built it as high as we could but then eventually it topples over. is there a formula to calculate how wide and heavy the base has to be for the ...
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1answer
43 views

How do I calculate the compressive strength of a wall?

I literally just have a thin steel wall that stands vertically with a load on top. The thin edges of the wall are oriented vertically with the load applied on top of the top thin edge, with the large ...
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1answer
36 views

Restricting rotational movement

I'm looking for an elegant mechanism for restricting the movement of the wheel cradle in the picture. The wheels are intended to be able to swivel around +-5° but not more. The initial idea is to ...
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1answer
40 views

Is Belytschko beam defined for 3D or 2D?

from the paper in this link , which is the Belytscko beam. I could not figure out if it is a 3D beam or a 2D one. if you don't have access to that paper, please check the page 73 on this link. what ...
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41 views

Calculating thickness of steel rod to support x weight?

I am building a workout area and would like to include a pull-up bar. So I have two 6"x6" wood beams planted in the ground 10 feet apart and will drill holes through them and place a steel bar through ...
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1answer
18 views

reinforce section of 6x12 header

I need to remove 5" x 48" of the middle of a 6"x12"x16' header so I can clear the AC units on the top of my motorhome entering the carport. The header supports a 6/12 pitch roof with trusses. What ...
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2answers
53 views

How deep do you have to check for problems underneath a building site?

When you're putting up a new building, you have to check the soil underneath for stability. How deep do you typically have to check? What's the extent of your "due diligence" when ensuring that a ...
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1answer
69 views

Can we build a building that could last thousands of years, if it was abandoned, in a humid continental climate? [closed]

Can we build a building that could last thousands of years, if it was abandoned, in a humid continental climate? Is this even possible with present knowledge? How would such a structure be built? ...
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34 views

Difference between ACI Code and Eurocode in Stiffness modifiers?

According to the ACI Code stiffness modifiers (modifiers used to reduce the moment of inertia) are used for each structural elements for example 0.7 for columns and 0.35 for beams... For those who ...
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24 views

Seismic Design Changes between ASCE and UBC Code?

what is the difference between the seismic design between ASCE and UBC code? from load combinations to loads applied to the history between the sudden shift or change in the code. and which one of the ...
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1answer
53 views

What is the Difference between ASCE and IBC Code?

What is the fundamental difference between the ASCE Code and IBC Code and what is the objective of each one? Thank you in Advance.
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1answer
25 views

Slab Stiffness Modifiers applied in Vertical Elements design but not in Slab design?

Why in the design of vertical elements (columns and walls) for a structure against lateral loads (such as seismic and wind) we use a slab (or shell) with a stiffness modifiers (such as 0.25 according ...
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1answer
25 views

Drop Panel Design Above Columns?

How to design a drop panel at a column in case the column above is rotated or not aligned to the below column (see image below), the code that i am using is the ACI Code if any reference for the ...
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1answer
140 views

At what level is the Grade Beam most effective at pile cap level or at Slab-on-grade level?

The primary two functions of a Grade/Tie Beam in spread footing and/or pile caps foundation system is to support the Slab-On-Grade (S.O.G) and/or to take the moment from eccentric footing (or moment ...
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1answer
60 views

Difference between Allowable Bearing capacity Service and Ultimate?

When we calculate the dimension of a foundation we always use the allowable SERVICE bearing capacity (lets call it qs) and all the necessary checks are based on this value qs. My question is why does ...
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1answer
37 views

Surface Area to Volume Ratio

I know there are some aspects we can try to apply this surface area to volume ratio to say physical chemistry in order to see reactivity of chemicals. However I am very confused in my structural ...
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28 views

Problem regarding mathematical operators in concern with impulse

So, my Question is why do we have $$\begin{align} -S &= m_H (V_H' - V_H) \\ -S \cdot l &= \theta_B (w_B'-w_B) \end{align}$$ because with what I understood about impulse so far, it should ...
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2answers
71 views

Design a part to straighten moment and reduce torsion

I have a configuration with two bolts and a point of force application (see figure). I understand that, if perfectly rigid, the two parts depicted in the figure will behave identically in how they ...
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1answer
35 views

Question regarding calculation of angular velocity connected to coordinate transformation

So i need to calculate the angular velocity of the dark disk, $w^*_3$. In the master solution they state it is : $w^*_3 = w_3 + \overline{w_3}$ with : $w_3 = \frac{|\dot{r}|}{4a}$ $|\dot{r}| = v_a +...
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1answer
55 views

Why don't we have parabolic ceilings with mirrors & a light at the focus?

I'm thinking of big halls, especially those that use chandeliers for light. The idea's simple: build a parabolic ceiling that uses mirrors, place the chandelier at the focus, and illuminate the entire ...
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1answer
39 views

Do concealed door closers exacerbate wear on a door's hinges?

Not being of an engineering background, I was first inclined to think that a door closer would reduce horizontal load on all hinges and not contribute any support in the vertical dimension. However, ...
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1answer
37 views

Self Weight in Moment Distribution (Hardy Cross)

When applying the moment distribution method also known as the Hardy Cross method, how do I take into account the self-weight of columns? In the case of the beams, I can just apply the weight load ...
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3answers
77 views

How to get corrugated plastic roofing strips to span 3m for rainwater exclusion experiment without building additional ground supports?

I'm trying to build structures to exclude some percentage of rainwater on experimental plots. I have three 20ft beam supports across the plot, spaced 3m apart and held in place by 4x4 posts that were ...
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1answer
26 views

Beam column joint reinforcement

Why cant we provide the bars cross bent in the beam column joint...as the cracks are all diagonal...so inorder to avoid cracks why cant we provide the bars crossed in the joint instead of providing ...
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1answer
46 views

Dimensions of a bar when it is subjected to axial pull

Determine the change in dimensions of a rectangular bar of length 2 m, width 200 mm, and thickness 100 mm, when it is subjected to an axial pull of 20 kN in the direction of its ...