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Questions tagged [civil-engineering]

Questions that fall into the problem domain of civil engineering or one of its sub-disciplines. Questions about buildings or other structures could usually use the "structural-engineering" tag also.

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What states other than California require less than 4 years of experience in order to obtain a PE license?

Do any states other than California require less than 4 years of experience to become a registered Professional Engineer?
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1answer
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Finding Stress Concentration Factor when (D/d) ratio is not on a table?

So we have this homework problem, it is a rectangular filleted bar and we have to find the minimum thickness. I go and calculated the ratios but here's the problem: (D/d) = 1.375. What may the problem ...
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1answer
24 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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1answer
26 views

Soil mechanics-Geotechnical engineering [closed]

Which is more economical to improve or change the soil that is used to build a structure? my answer is that it depends on each case, but I would like to get more information, or where to search about ...
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28 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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1answer
15 views

Centroid and toppling [closed]

A uniform block is in the form of a square ABCD of sides 2 m and a unit thickness. E is a point on AD such that ED = xm. The portion EDC is then removed from the block. What is the maximum value of x ...
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12 views

Why do auxetic materials have higher energy dissipation rates

Below is an extract from a thesis called "Auxetic Structures: Towards Bending-active architectural applications" on page no. 80. In a NPR (Negative Poisson's ratio) material the energy ...
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1answer
37 views

Does the pressure due to corrosion in concrete depends on degree of corrosion?

I am trying to relate the degree of corrosion with the pressure exerted in surrounding concrete. My common sense tells me that higher the degree of corrosion, higher should be the pressure exerted, ...
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1answer
39 views

What are the factors that made narrow-gauge railways cheaper in the early 1900s, and are they still applicable today?

Back when railways were being massively build, in the 1900-1910 decade for example, most new lines were made with narrow gauge, instead of the standard gauge which is 1435mm for most of the world. ...
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2answers
85 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 ...
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2answers
49 views

Why do normal tunnel boring operations not use the dirt (from the boring itself) for reinforcement rather than bringing it from other sources?

According to Elon in this video (@13:06), he states that the reinforced segments are 70% just dirt, but in normal tunneling, they actually truck the dirt out and bring new dirt in which seems very ...
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How much seawater could be desalinated using the waste heat from a powerplant?

I've done some rough calculations on how much water could be produced by using the waste heat of a powerplant to boil seawater. I'm interested in a ballpark figure and would like to know if I have a ...
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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 ...
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17 views

Drinking Water Treatment R&D: Mechanical or Civil Engineering Degree? [closed]

I will be a freshman in University next year. After graduating, I would like to get a job in the R&D sector of drinking water treatment technologies. I'm unsure if I should get a degree in ME or ...
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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 ...
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1answer
24 views

Optimal plumbing layout for 3 storey building?

I'm trying to design a plumbing system for a school project, and I want to verify that my initial piping layout from water source to outlets is logical before I start making calculations and programs ...
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0answers
19 views

Heat storage mass vs. AIR in an ICF house

If we would want to build a family house (ICF) regarding operational costs, should we leave the insulation on the inside, or should we remove it from the inside? If we would remove it, the walls ...
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1answer
64 views

Is there such thing as supreme board for international arbitrators?

My cousin is a mechanical engineer, got contacted today from someone who claimed to be working for the supreme board for international arbitrators (sbia) and ICAC in the Middle East and north Africa ...
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1answer
55 views

A way to calculate the magnitude of the moment

In my engineering textbook, I didnt understand the example given to explain the magnitude of the moment. It asks to calculate the magnitude of the moment about the base point O of the 600-N force in ...
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29 views

what is the chance of sustaining load if beam is 20 feet long? [closed]

what is the chance of sustaining load if beam is 20 feet long as center pillar of house is removed in first floor and added 20 feet long beam with 20 mm rods in RCC beam? House details :: 30*40 sq ...
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1answer
36 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 ...
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2answers
102 views

From the viewpoint of a civil engineer, what was the purpose of this bridge?

I have been searching for historical structures in the province of Van, Turkey, by examining the publicly available satellite imagery like Bing Maps. There is a historic bridge near Kaçit, Çatak. Its ...
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1answer
64 views

What's the concrete core for in a building?

I'm watching the progress of a new office building being built over the road (essentially a manual timelapse). The way the building progressed was by the pouring of a concrete core in the centre of ...
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0answers
33 views

Wearing course for Helipad

I am tasked with the design of a helipad for a remote government facility. Annex 14 Part II (ICAO Convention on International Civil Aviation) does not clearly state what materials are acceptable. The ...
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1answer
47 views

What Are The Procedures To Get a US Professional Engineer License?

I am a Civil Engineering professional having around 7 years of field experience and is now working for a govt. agency. All I want is to get a Professional Engineering (PE) License. But at present, I ...
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1answer
71 views

Stiffness as a function of thickness

Let’s say we have a thin band (made out of PLA, 3D printing material) with a rectangular cross section. In drawing, it would look something like this: Let’s say a force of 15 N is to be applied from ...
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1answer
39 views

Pathway for drone racing

How can I build a v shaped pathway for drones? It would be a sort of racing path and there would be multiple drones flying over the pathway at the same time. The race would be a relay race. So there ...
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1answer
46 views

Does rain cause Tarmac / asphalt pot holes? If so, how?

Does rain cause Tarmac / asphalt pot holes? If so, how? After a period of rain in my city there are plenty of fresh new pot holes in the Tarmac / asphalt surfaces. The immediate cause is obviously ...
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1answer
76 views

Can secondary beams be supported to columns occaisionally?

If there are secondary beams running between primary beams, and columns support the primary beams, then is it allowable to have the occasional secondary beam pinned to a column? Otherwise it seems to ...
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1answer
36 views

Can you make a decision on where is defect if you have the frequency spatially?

Let's say for a steel bar, you have the frequency information on each spatial location along the steel bar, could you make a decision that a defect/crack is exist on the specific location without ...
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1answer
72 views

What's sort of “sidewalk” pavement is this?

I was recently walking down a road when a car came my way (I'm an inveterate jaywalker). I moved over to the sidewalk, only to notice it clearly wasn't a sidewalk at all. The pavement looked like this:...
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0answers
31 views

Required diameter for ballast drop hole? [duplicate]

I'm currently an underground Geotechnical Engineer, don't spend a lot of time on the surface. I'm trying to find a reference or method for calculating the required diameter of a service hole. My Mine ...
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1answer
79 views

What can a licensed Mechanical Engineer do in the civil/structural field?

When I was younger, I had interned in a civil/structural engineering firm specializing in bridges that had many PE civil engineers on staff and a couple licensed mechanical engineers. Now as a soon-...
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1answer
41 views

What is the curing process for polymer concrete if it doesn't use any water?

The curing process for regular cement concrete is sprinkling water fog or using a moisture retaining fabric. I was wondering what the process is for polymer concretes because they don't use any water.
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Street Light Arrangement Method

Hello I am a high school student and I am curious about how street light is arranged along the road. Is there government laws to install street light on the road or is the arangement of the street ...
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1answer
80 views

Equation of the parabolic suspension bridge cable when the deck mass is known

I'm reading the derivation of the equation of the hanging catenary from Wikipedia: https://en.wikipedia.org/wiki/Catenary In the same article the parabolic equation governing the shape of the main ...
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2answers
62 views

How would you calculate the force needed to rotate along the x axis vertical earth anchor in dirt?

I'm a high school student who hasn't had the pleasure of taking physics yet, so forgive me if the answer is obvious. The problem I have involves an earth anchor drilled vertically into the earth. I ...
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3answers
200 views

Why aren't there moments in truss bridges?

One of the assumptions we make when analyzing truss structures (method of joints for example) is that all the components are assumed to experience only compressive and tensile forces, not bending ...
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0answers
28 views

What does C20019 IN PAIRS AT 900 MAX CTS WITH 2 ROWS OF BRIDGING AT 1/3 POINTS mean in a technical drawing?

Specifically, does in pairs mean that there are 2 C20019 members per indicated line on a technical drawing?
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1answer
74 views

Drilling holes in ground and fillin with gravel - to what ends?

Near where I live there's a construction site for a new supermarket. The last week or so they did things I don't quite understand. Some background: The ground in our area (Ruhrgebiet) is rather ...
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44 views

Difference between direction of ramming in hydraulic press?

In Printed circuit board/Plywood lamination Hydraulic Press machines (seen here). The ramming action comes from bottom in all the machines I saw so far. For such action from bottom, excavation has to ...
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1answer
131 views

Can we have plinth beam below ground level for small homes?

For a small 30 square meter home (8 x 3.75) is it feasible to have plinth beam 2 feet below ground? Technically, is it better than or worse off than standard procedure of plinth beam at ground level? ...
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3answers
50 views

Excavation near existing structure

I am thinking of building a house with basement next to some existing structures. Are there rules of thumb on how closely/deeply you can excavate next to an existing structure? By moving farther away ...
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1answer
3k views

Why are truss bridges the way they are?

Just by taking a train ride across my home city I can see truss bridges like the one in above picture everywhere. There are numerous variations, but the most common design seems to be this. But why ...
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1answer
80 views

Volume change during tensile test

During tensile test, why does the specimen's(let's say mild steel) volume changes during elastic deformation and does not change during plastic deformation?
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1answer
67 views

Which polymers are used to make polymer concrete?

I was going through the wikipedia page on polymer concretes. It seems like a good type of building material. I was wondering which types of polymers are used in the concrete, since I cannot find any ...
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4answers
1k views

Why does column buckling occur when the load is parallel to the column?

I'm studying Euler's work on structural engineering from a book out of curiosity and it is mentioned that he developed a mathematical theory describing the buckling of columns under a parallel load (...
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1answer
66 views

Thai Cave Rescue-Using trace gas detection to locate chimney entrances [closed]

One of the potential ideas that was suggested for rescuing the Thai soccer team trapped in the cave is to locate a "chimney" or secondary entrance to the chamber where the team is trapped. However, ...
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2answers
184 views

Ceiling mounted punching bag without compromising structure or floor above

This question is regarding the safest way of installing a heavy punching bag of 100 lbs from the basement ceiling. Above the basement ceiling is a wood floor. The goal is to sleep soundly at night ...
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1answer
271 views

Thai Cave Rescue- Why the narrow portions are not being broadened?

Tham Luang cave rescue incident is taking combined effort of Engineers throughout the world. Various news media is telling currently it is not possible to pass more than one person through some very ...