Stack Exchange Network

Stack Exchange network consists of 174 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.

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
36 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
33 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 ...
0
votes
0answers
22 views

How to identify building types?

In absence of documents(e.g. plan, drawings etc.) how to determine the category of building after building has been erected completely? See the intended categories of buildings in the attached image. ...
3
votes
1answer
63 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
29 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 ...
1
vote
1answer
66 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-...
1
vote
1answer
24 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.
0
votes
0answers
20 views

contaminant propagation time

I have a network , How can I calculate contaminant propagation time in each pipe ? By epanet only or by epanet-matlab toolkit. More explain: I want to have contaminant propagation time in each pipe ,...
3
votes
0answers
37 views

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 ...
0
votes
1answer
61 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 ...
1
vote
1answer
51 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 ...
1
vote
3answers
114 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 ...
1
vote
0answers
27 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?
4
votes
1answer
65 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 ...
2
votes
0answers
41 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 ...
0
votes
1answer
27 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? ...
0
votes
0answers
12 views

How can get initial and final node for edge

I have a network in EPANET, I Run the network . I need to Identify the initial and final nodes for each edge , in network. How to detect the primary and final nodes for each edge after the ...
1
vote
3answers
48 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 ...
0
votes
0answers
27 views

why there is overestimated or underestimated occured in machine learning prediction?

I have these 5 cases I considered to validate my ANN model all parameters included ave thick, plate width, plate length, initial thick, young modulus, ultimate strength, yield strength parameters in ...
17
votes
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 ...
6
votes
1answer
54 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?
0
votes
1answer
52 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 ...
10
votes
4answers
954 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 (...
1
vote
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, ...
2
votes
2answers
57 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 ...
1
vote
1answer
266 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 ...
2
votes
0answers
47 views

What does it mean to do a “hot casting” of a brick?

I was talking to someone about brickmaking and he said doing a "hot casting" of a brick requires more energy and there are alternatives that use less energy. What does that mean?
1
vote
0answers
24 views

How to ensure natural ventilation through a shaft?

I have a small shaft, 2.5m wide by 4m deep, sunk into the ground. Due to explosion protection I should ensure "natural ventilation" - this is the termgiven in the relevant ordinance, no air flow ...
1
vote
1answer
26 views

Simple way to duct a PVC pipe through a stainless steel sheet cover

I need to duct a PVC pipe (DN80) through a stainless steel sheet metal covering. The hole thing needs to be tight against stormwater. There's tons of products to duct pipes through thick walls, but I'...
1
vote
0answers
24 views

Can you create concrete without using water and cement as a binding agent? [closed]

I know sulfur concrete is one. Epoxy resin can also be used too. Are there any others?
2
votes
1answer
28 views

Why does sulfur concrete require no cement?

Sulfur concrete only uses sulfur as a binding agent then an aggregate. Why does it not use cement?
2
votes
3answers
57 views

Save loose soil from erosion on a slope

I have a drive way which has knick at point ot smoothen is out i leveled it by putting loose soil But its monsoon season and rain washed away all my soil as water comes running down slope. In pic ...
1
vote
0answers
39 views

How to define the Clothoid Constant in Clothodial Arc ( Spiral Curve)?

Referring to the document here on IfcClothoidalArcSegment2D, we have ClothoidConstant, which is defined as The constant $A$ (not $A^2$), that determines the ...
2
votes
0answers
22 views

The use of Theis equation based on time

The storage coefficient (s) for artesian basin can be determined by the following equation (Theis equation): $$s=\frac{Q}{4\pi T}\int_{\frac{r^2S}{4Tt}}^\infty\frac{e^{-u}}{u}du$$ Does this ...
0
votes
1answer
32 views

What is the entirety of breadth of road called?

As roadway consists of a width of road on which a vehicle is not restricted by any physical barriers or separation to move laterally source, what is a similar term which encompasses the width of the ...
1
vote
1answer
53 views

What type of grit separator can be installed between the inlet works and bar screen of a wastewater treatment plant?

An existing sewer treatment plant is experiencing maintenance issues with their first stage (bar screens) where grit which is just barely larger than the apperture (bar spacing) of the bar screens ...
1
vote
2answers
62 views

How to determine how large each terrace should be on a multi-level retaining wall?

I am making a concrete sleeper wall and am unsure of the current structural integrity (I am not a civil engineer) specifically regarding the width of each terrace. My retaining wall will be made ...
3
votes
0answers
39 views

Simplifying head loss across a piping network

I am tasked with designing a compressed air piping network,with and would like to determine the pressure loss across the different layers of instruments -now here is the 3D layout of the network. ...
1
vote
1answer
37 views

Why don't we use other substitute of cement while building a roof for thermal proofing?

Cement heats up like crazy. I live in the top floor and the heat is unbearable. Also it has a high carbon footprint. Why still cement is vastly used? When there are so many better alternatives?
0
votes
1answer
49 views

I’m a civil engineering consultant, and I am analyzing different properties across US to develop long-term property maintenance plans

I am looking for some pretty specific tasks to be carried out by a software program. I’m currently using Civil 3D, but I can’t help but think there is a better program (or at least a better Autodesk ...
3
votes
2answers
111 views

Second Moment of Inertia (or Second Moment of Area) of Beam Section

I need to calculate the moment of Inertia Iyz but I find 0 information online about how to get it or solve it in a real problem, only that is equal to $$\bar{I}_{yz}=\int yz\text{ d}A$$ How can I ...
0
votes
0answers
31 views

Independent constraints - Procedure to verify it

I am wondering if there is a procedure to verify that the constraints of a system of rigid bodies are independent. Here there is an example of a system with dependent constraints: L beam - Strange ...
2
votes
1answer
60 views

L beam - Strange result

I have the following system (at P and Q there is a ball joint; the length of L beam is l; the PB and PA forces are applied at l/2 and are known; Fz is not zero and is known): The system has 0 degrees ...
1
vote
0answers
20 views

What's the flow resistance of a honeycomb sieve?

Honeycomb sieves are starting to see applications in wastewater screening. What is the flow resistance of a honeycomb screen? I would expect something similar to the Kirschmer formula (used for bar ...
4
votes
2answers
47 views

How to provide lateral support for adjacent masonry during installation of steel UC in an old cavity wall?

I've got a structural engineer ready to provide calcs on this job, but there is a specific aspect where I'd like a heads-up what the normal approach would be, before I raise it with him, in case he ...
1
vote
2answers
50 views

Finding the displacement in a truss using energy method Question

I've been trying to revise for an upcoming final so I am solving problems from the previous chapters.I've been wracking my head on this for a while (about 1-2hrs) but I just can't seem to get it. For ...
0
votes
2answers
47 views

How can I determine horizontal force reactions in a fixed on both ends beam [closed]

How can I determine horizontal force reactions in a fixed on both ends beam like this one?
3
votes
3answers
75 views

What is this kind of sewer maintenance work?

I took this photo behind my place; there was this group of workers for about an hour. They have a small hose, from the black spool, they were pushing in and out of the manhole and a large hose that ...
0
votes
0answers
20 views

Names for pressure and traction using projected area

Normal force per unit area is called pressure. Force in some general direction per unit area is called traction. What are names for: A) Normal force per unit projected area B) Force in per unit ...