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Questions tagged [structural-engineering]

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

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21 views

Elastic waves in very thin plate

Elastic waves in structural elements are described by \begin{align} \rho \frac{\partial^2 u}{\partial t^2} &= (2 \mu + \lambda) \frac{\partial^2 u}{\partial x^2} + \mu \left( \frac{\partial^2 ...
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1answer
25 views

The best foundation type?

What are the best foundation type for a construction in the city and earthquake prone area? If bored pile foundation is the best, which type is the best, square, circle? what are the considerations of ...
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9 views

Assigning different thicknesses to single part - ABAQUS

I am trying to validate the results of linear analysis from RSTAB (structural analysis tool) with ABAQUS. The model comprises of approximately 800 members. Each member is composed of built-up sections ...
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1answer
15 views

For arc-length method in nastran, how to analyse post-buckling behaviour with load decrease

I am currently trying to model the buckling behaviour of a cylinder using sol 400 nonlinear static analysis using Nastran. I am using the arc-length (modified Riks) method as apparently it can ...
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0answers
23 views

How to calculate the thickness and arrangement reinforcement bar? [closed]

A concrete culvert (inner size: 3.0 m ✕ 3.0 m) shown in the figure on the right side is planned to be embedded in soft sandy soils 2.0 m beneath the surface of a road. Calculate and determine and the ...
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14 views

What kind of surveys and tests necessary? [closed]

A transformer (weight 200 ton, contact area on the ground 8 m ✕ 5 m, height 4 m) is planned to be installed on the flat ground of soft cohesive soils. Answer the following questions for the sake of ...
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2answers
30 views

Where can I find a list of building codes to put on a set of blueprints for a addition

Most architectural companies have a template of blueprints they reuse for every project. As an owner-builder, I need to make these blueprints from scratch On page 1, I have to list all applicable ...
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23 views

Structural response and Reinforcement in shell elements when using SAP2000

Aqueduct is hydraulic structure compose of bottom slabs resting on sidewalls. Bottom slabs acts as one way slabs while side walls act as beam , as per our conventional design assumption. But when it ...
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1answer
40 views

Problem while solving for the moment of a cantilever beam

As in the first image, Moment at any point between C and B should be 0. But when I try to solve it by substituting equal and opposite forces at end C so that anti-clockwise moment of $F(l-a)$ and ...
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46 views

Problem with cantilever beam and yield strength

Hey, I make a project in which I use a cantilever beam with distributed equal load across the whole beam and I'm using the formulas above to calculate the displacement, moment... My specifications ...
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1answer
38 views

Maximum I-beam girder S12x31.8 span

Does 200lb/in of load on a S12x31.8 over 15 feet seem reasonable? I'm having a tough time trusting the numbers. Two story house with an attic as below. Dotted lines show load bearing walls W1 and W2. ...
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1answer
28 views

Free pre-processor for Nastran?

I want to do a non-linear analysis (possibly SOL 400) on Nastran. I used PyNastran (python module) to set-up the BDF file for a Linear buckling analysis (sol 105). However I feel like it might be too ...
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1answer
29 views

How would I do a buckling analysis with an additional fixed known lateral force?

I am using Nastran for buckling analysis, and I'm new to all of this so please bear with me. For a linear buckling analysis, I understand that you must first apply any compressive load in the static ...
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1answer
30 views

What will be the the width of the column strip in the case of 2 different spans in the same direction?

Say we have a plan of a building as follows and it is required to be designed using DDM (Direct Design Method). since the moment needs to distributed laterally into a column and middle strips and ...
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1answer
31 views

Why is buckling caused by nonlinear geometry?

I've been reading the Comsol post on geometric nonlinearity. The article introduces situations where the small angle approximation and linear analysis of structures gives inaccurate results. For ...
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2answers
46 views

Deflection In Multistory Structure

When analysing and designing a structure for the serviceability limit state the deflections of each beam must be found. When considering a multistory rigid jointed structure (as below) and applying ...
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2answers
28 views

What is meant by “perfect geometry” in the context of Euler buckling?

In this question for example (in the first answer) it is said that the Euler critical load formula is unrealistic, because it assumes perfect geometry and perfect alignment of the load. I've found ...
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2answers
20 views

Electric Arc Furnace Steam Production

How much steam is emitted from an electric arc furnace in a unit of time? I have not been able to find any data on this which is strange considering the amount of water that is used to cool an ...
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2answers
43 views

King post roof truss analysis

I know that the King Post and "Truss Web" or "braces" are there to make the whole truss "stronger", but can someone explain what are they actually supporting if there is no load on the bottom chord/...
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1answer
32 views

Earthquake proof building [closed]

If a building or big structure is situated on top of flat ground without any of its part inside the ground, should the building be safe? Let's say our building is a big (as big as we can imagine) ...
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1answer
39 views

Structure other than a wall to reduce wind?

I own a small farm which apparently lands in the middle of 2 small mountains therefore is a big wind tunnel. The wind gets pretty insane here. Wondering if there is a structure I can put around my ...
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18 views

Passive pressure at bottom of soldier for a shoring wall

The passive earth pressure "Pj" at bottom of soldier in a shoring wall getting from literature "Soldier pile System" in CA trenching & shoring manual (revised 06/95) & used in certain software ...
3
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1answer
25 views

Truss analysis of internal forces in members

I am trying to calculate the internal forces and their nature in this truss, however, I cannot seem to do so as both the method of joint and the method of section do not work. I think this is because ...
2
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1answer
28 views

What calculation to find how much force before tipping over?

I was thinking of building a free standing structure out of plumbing pipe that would go flush against the wall to hang jackets and other items. Attached is a sketch of the general thought of what the ...
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2answers
42 views

Why are/were sewers made large enough for somebody to walk down in there?

Today, I have been reading a lot about sewer systems on Wikipedia, in the hope that I would find information or at least photos showing what I think of as sewers, namely somewhere under the streets in ...
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0answers
39 views

Is a Geodesic Dome (fuller dome) that floats possible? What material or engineering effort would it take?

Buckminster Fuller has popularized Geodesic Domes (invented by Dr. Walther Bauersfeld who based it on the use of convex polyhedrons), and thus, making buildings with a very large roofs that don't ...
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2answers
63 views

What are these “water fountains” in the middle of a river in North Korea? (Probably also found elsewhere.)

While watching a video of somebody flying an airplane over North Korea, I noticed in a river these two "water fountains": I vaguely recall seeing this previously, probably in the US, as well. My ...
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1answer
49 views

Boring through joist

I just started my BEng, so I actually don't feel ready to assess real cases. Upper floor of my quite standard British terraced house. We would like to hide an existing drainage pipe which is ...
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1answer
37 views

What criteria must apply for torsional effects on this beam to be ignored in calcs?

I'm interested in how to work out whether torsional effects can be ignored or not, in calculating the adequacy of a given steel beam in the following idealised eccentric scenario. Or, equivalently, ...
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1answer
28 views

Negative Eigenvalues in Ritz Solution of First-Order Shear Deformation Theory

I am trying to write a MATLAb code for determining the natural frequencies of a first-order shear deformation plate using Ritz method. I am using Legendre polynomials as trial functions in Ritz method,...
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2answers
136 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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0answers
20 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
41 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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0answers
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
26 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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2answers
40 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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2answers
30 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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2answers
47 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
29 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
34 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
51 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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2answers
58 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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2answers
85 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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3answers
39 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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0answers
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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1answer
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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0answers
93 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
73 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
49 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 ...