Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

1
vote
1answer
47 views

Maximum tensile and compressive stress in a T-beam

Where does the T-beam come from? There's just a straight beam resting on two supports. And where do 10 and 80 come from? I am so confused.
1
vote
1answer
37 views

Determining the direction of internal forces in a truss

I am learning the method of joints, but there's no explanation on how to figure out the direction of internal forces in my course. How do you know that BA is tension and BC is compression?
4
votes
1answer
97 views

Is Scrooge's giant glass dome feasible in real life?

In an Uncle Scrooge (or Scrooge McDuck, not sure of the translation here) comic named "Treasure Under Glass", Scrooge orders a giant glass dome to be manufactured in order to aid his endeavours ...
0
votes
2answers
55 views

Comparing the precision work of plane surveying and geodetic surveying

In geodetic surveying, we consider the spherical geometry of the surface though the surface is not perfectly spherical. In-plane surveying, we consider a small surface area which is considered as a ...
1
vote
1answer
82 views

How will using desert sand instead of concrete sand affect my concrete recipe?

I've read that desert sand is too round for concrete mixes. But, I'm not building a dam, I'm building a 3 foot landscaping wall. I'm interested in using desert sand for the color, so this is an ...
0
votes
0answers
19 views

What injectors are typically used for mixing sewage sludge?

One typical way to heat sewage sludge digesters is to pump the sludge through heat exchangers, raw sludge is injected before or after the HX. What kind of injectors are typically used for this? I'm ...
0
votes
1answer
33 views

The formula for partial flow of Box Culvert

Refer to this document, and particular to Figure 2: I wonder what is the formula that governs the box culvert partial flow with respect to full flow? In other words, base on what formula the above ...
0
votes
0answers
24 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. ...
2
votes
0answers
26 views

Eulerian description of fluid flow

In Eulerian description of fluid flow, we observe how the properties of the fluid are changing at a point. Since a point has zero dimension hence a zero area, how can we make sense of the 'finite ...
0
votes
0answers
33 views

Command line Macro?

AutoCAD 2017, Civil 3D - I have gone into "customize user interface" and created a new command. What would the Macro be to simply select a 3D polyline in the shape of an "L" and turn it into a square? ...
0
votes
0answers
48 views

What is the best approach to fix empty pockets in a concrete slab/wall

What is the best approach to fix the pockets seen below: The pockets were due to the stones in place which did not allow to pass the concrete material, and later on gravity made it's way. Options on ...
2
votes
2answers
93 views

Indeterminate beam with a guide at each end

I've been battling with a statics question (as attached) and can't for the life of me figure it out. I've attempted removing the left side guide joint so then there are only 3 reactions and it should ...
1
vote
2answers
50 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
votes
2answers
60 views

Could pre-stressed graphene be used to reinforce granite block construction?

I am curious whether this will become an option, especially for longer lasting structures. Could pre-stressed graphene or another high tensile strength material by used to reinforce granite block ...
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 ...
1
vote
2answers
91 views

How do I calculate the reactions in this truss?

How do I calculate the reactions in this truss?I would usually cut in the joint where beams 5,6,7 and 8 are and calculate reactions in the two trusses that are created.How do I do that when there is a ...
1
vote
1answer
17 views

Drucker-Prager Model Parameters, a Proper Choice

My task is to write a code from scratch for 3D elastoplasticity, namely a DP model (see for example DeSouza Neto, et al., 2008, Chapter 8) having yield surface $$ f(\mathbf{\sigma},c) = \sqrt{J_2(\...
0
votes
1answer
29 views

Can I use grout as mortar?

I have one tile that came off. I got a replacement tile, and some grout. But the online guides say you need mortar to glue the tile to the ground. Can I use the grout as mortar? I want to save money ...
0
votes
0answers
19 views

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?
1
vote
1answer
15 views

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 ...
0
votes
1answer
36 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.
0
votes
1answer
31 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 ...
4
votes
0answers
37 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
votes
1answer
21 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 ...
0
votes
0answers
17 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 ...
3
votes
2answers
52 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, ...
1
vote
1answer
48 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. ...
3
votes
2answers
94 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 ...
0
votes
2answers
53 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 ...
1
vote
0answers
27 views

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 ...
2
votes
0answers
44 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 ...
2
votes
0answers
19 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 ...
1
vote
0answers
27 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 ...
0
votes
1answer
49 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 ...
1
vote
0answers
20 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 ...
0
votes
1answer
68 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 ...
2
votes
1answer
110 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 ...
1
vote
0answers
31 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 ...
2
votes
1answer
55 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 ...
1
vote
2answers
109 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 ...
4
votes
1answer
70 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 ...
1
vote
0answers
34 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 ...
0
votes
1answer
52 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 ...
1
vote
1answer
81 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 ...
0
votes
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 ...
3
votes
1answer
52 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 ...
4
votes
1answer
140 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 ...
1
vote
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 ...
4
votes
1answer
80 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:...
3
votes
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 ...