# 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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8 views

### LID Design - Layout and Concepts

I have a general but important question regarding LID design. I work as the only civil engineer at my company, and I have rarely used LID design in my projects. I am trying to familiarize myself with ...
18 views

### Hoe functioneert de Blum-methode in detail?

i dont understand how the method of blum works can someone explain it to me if you are dutch it would be a big help although english works aswell.
20 views

### Are mutli-story structure slabs poured on-center?

What exactly does it mean to have a multi-storey building where each storey is 2.4 meters? I've read a lot of descriptions of buildings that say each storey is "2.4 meters" or "3 meters&...
42 views

### Running utilities into bomb shelter / bunker

In peace and disaster time, bomb shelters are utilised for living spaces. Hence, what are some considerations for drilling through the reinforced walls to run utilities such as water, petrol, ...
33 views

### How is the city power grid routed and connected to individual locations such as houses?

I'm an electrical engineer but I don't know enough about the power distribution grid or civil. I'm no electrician either. My initial question is how does a new construction, like a home, get safely ...
46 views

### What is the formula to define the flexural strength of an upright cylinder?

I have been making cylindrical concrete coasters and, for fun, have been seeing if my friend's can snap them. Every subsequent mix design I'll change the mix itself or the dimensions of the geometry ...
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### Why do period and damping ratio affect acceleration?

In the table above, the period of the structure $(T)$, the acceleration coefficient on the structure ($g$ in terms of gravitational acceleration) $Sa(T)$, The damping ratio is expressed as $ζ$ . As ...
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### Calculating Lateral Load Take Down

So this is the part of the project I am trying to do: "Two load take downs in the vertical and lateral directions, from the roof level to the foundation considering both normal loads and ...
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Hi Please help me answer my homework about simplifying load diagrams quickly, Thanks. I don't know how to simplify the left-hand side but on the Right-hand side I'm guessing I have to move that 5 ft/...
63 views

### "Increasing the water pressure" in the old pipes in the Palace of Knossos

In the Palace of Knossos, Crete, Greece there is an old piping system partially preserved, with the following commentary: Series of clay pipes with one end narrower than the other so that they could ...
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16 views

### Flow in vent of a pipe

I have a horizontal pipe of diameter 2000mm (uniform cross section), the pressure of gas flowing in the pipe is 1.2bar and the flow velocity is 15m/sec. there is a 100mm diameter vertical vent ...
1 vote
109 views

### Wind Pressure on Chimney

I have this question that I am trying to solve. I will explain problem as best as I can. A brick chimney has parallel sides and a height of 18m. It has a square sectional plan with dimensions of 2....
59 views

### Is there any standard procedure or guideline to solve complex asymmetrical trusses such as saw tooth type of truss used for polyhouse construction?

I want to solve for the dead load,live load as well as wind load for a saw tooth type of truss, which is asymmetrical in nature....generally used for the construction of greenhouse. I also want to ...
15 views

### How to go about designing a window that can selectively allow light, air, and sound in depending on the occupant's preferences?

The usual combination of window + blind today allows occupants to pick between allowing in external light, blocking external light, allowing external air exchange, blocking air exchange. I'm curious ...
41 views

### Do tensile and compressive stresses create moments?

Below are 3 examples I designed. My question is about the tensile and compressive stresses that occur in 3 examples under the influence of a horizontal force F=100N (earthquake force). I ask my ...
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### How would you go about the steel columns being adjacent where an expansion joint is expected?

The building is a steel building with a composite slab. The expansion joint is required because the building is 60m in length. The problem is where the expansion joint is expected, the columns are ...
57 views

### How to calculate the height of the supporting structure of an arch and the thickness of an arch in relation to its span

Please refer to the attached image. We know that if an arch is X unit wide then the supporting walls should not be less than X/4 unit width for the structural stability. I would like to understand ...
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### Calculate the deflection of a fixed supported beam

I am having a lot of trouble with the below question. Im not really sure how to calculate the deflection of the x coordinate, how do i go about completing this question? Any help would be appreciated ...
23 views

### FInding deflection on a uniform beam with supports ~ Incorrect answer

Hello I am asked to find deflection of beam in millimetres at different points. The uniform beam is 3.55 meters long with a flexural rigidity of 32269Nm^2 It is under a uniform load of 92N/m and is ...
12 views

### Finding deflection on a uniform beam with fixed supports ~ Incorrect answer :(

This question has asked us to find the deflection of a beam (in millimeters) if the beam is under a load of: f(x) = 9.46(x+0.82)(9.2288-x) N/M The beam is supported with fixed supports at both ends ...
27 views

### Buckling length of continuous steel H columns in multi story buildings

I have seen that steel columns in multiple story buildings span multiple stories, in that case how do you calculate the buckling length for the column? do you take the whole column's height, or just ...
101 views

### Will car be able to fit in from this gate from front, as well as from rear?

The gate is 8 ft (96 inches) and the road is 10 ft (120 inches). I am not a engineer nor a professional.
13 views

### Computing shear strain in a discrete domain

i am doing a uniaxial test on a body and the body(2D) is discretized to a number of points(x,y)and is assumed to be elastic. the node size is $\Delta x = \Delta y$. Let us assume that force is applied ...
27 views

### Find the internal bending moment, Mc

A 7meter,m, long cantilever beam whose weight per meter is 19Newton, N, carries a load that varies uniformly from 43N/m, (Newton/meter), at the inbuilt side, point A, to 0 at the free end, point B. ...
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49 views

### Shear Wall placement -- reflectionally symmetric or rotationally symmetric?

Is it better to add a shear wall that is reflectionally symmetric or rotationally symmetric? I'm designing a confined masonry structure in a seismic zone. My understanding is that the shear walls are ...
55 views

### Infinite Solution in Truss Problem by Method of Sections

This is the problem, I need to find forces in members 6-8 and 3-8. I have made a horizontal cut cutting across 3 members but I find out that I am only able to formulate 2 independent equations, one of ...
60 views

### Counterweight requirement and platform design for motorised speaker stand stability

I recently bought my dream speakers (Dutch & Dutch 8c), but at the cost of having to preserve a minimalist interior for the sake of household peace. To that effect, I plan to construct motorised ...
52 views

### Flexure formula

The flexure formula is valid only for a. Static loads b. Dynamic loads c. Static load with negligible residual stress d. Dynamic load with negligible residual stress
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### Unit conversion error - Darcy Radius of Well Influence Equation

I'm having a little trouble. I'm trying to convert the answer from imperial to metric but can't seem to get the answer to match. I am using the formula attached (Darcy Radius of Well Influence ...
187 views

### Is this "diverging roundabout" a valid interchange?

Thinking it might be possible to incorporate the diverging aspect of DDIs into a 4-way roundabout, I came up with this free-flow (highway-to-highway) interchange, which only requires 4 relatively ...
298 views

### How bad is it if water is leaking through concrete in the lower parking levels of my apartment building?

I live in a 14 story apartment complex built in the 70s that has three underground parking levels. Today it looks like there's water leaking through cracks in the concrete on the second and third ...
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### Is my basement flooding because the city floods a neighboring field to make an ice rink?

I bought a house about a year ago that was built in 1952, and the original house has French drains and a sump pump which keeps the basement dry. There is an extension, however, which was added at some ...
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### Ansys Pedestrian-Induced Vibration on Bridge

I have a concrete girder box bridge that is 40 m long and 4 meters wide, and I would like to simulate the response of the bridge using Ansys random vibration for pedestrian traffic. What are ...
44 views

### Culvert screen design principles

Culvert inlet trash screens typically consist of a series of oriented bars/flat bars, angled to some lesser or greater extent in the direction of flow. What motivates this design? why not a mesh or ...
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### homework : torsors of constraints: Coulomb's laws

Bonjour , j’ai un devoir maison sur les torseurs mécaniques en lien avec la loi de Coulomb et Statiquecet je n’arrive pas à résoudre! Pouvez-vous m’aider s’il vous plaît?! Je met le sujet en photo ...
64 views

### Examining the structure of old buildings

Generally speaking, many cities were built across long periods of time. When a city is expanded, still in general, the old part becomes the center, and the new parts increase the size of the city from ...
20 views

### Obtaining fundamental soil parameters given only soil average density, sample volume, and mass

Assume that there a soil sample has a known density $\rho$, volume V, and mass m. Given only this information, is it possible to obtain fundamental soil parameters for cohesion, internal friction ...
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### Climate Data not showing up AT ALL in PaveME

Anyone else have this issue? If so, how did you fix it?
16 views

### Question in Reinforced Design Course - One Way Slab ACI code

Establish the thickness of the floor slab shown of figure below (for section 2B1- 2B2-2B1) for a service live load of 4.8 kN/m2 . Use f'c = 25 MPa, fy = 400 MPa, and ACI code. Show all your step-by-...
1 vote
747 views

### What type of math do civil engineers use?

I was wondering if my algebra teacher was right. She was an electrical engineer and said that in her field she used lots of algebra and calculus. I'm not exactly good at algebra, so would like to know ...
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1 vote
82 views

### Creating a map of a place

I would like to know what are the tools and the techniques to create a map as precise as possible of a place, typically interior, and also, in certains reasonable way, quickly. That is, a 2D ...
233 views

### Shear Force in Inclined Beam

Suppose I have an inclined beam with a UDL applied vertically downwards, will the shear force act normal to the beam, or vertically?
19 views

### 2D frame analysis by open-source Lua code

There are great apps for 2D frame analysis like the one mentioned here: https://engineering.stackexchange.com/a/50967/15178 I'm just wondering if anyone knows an open-source Lua code for 2D frame ...
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1 vote
54 views

### Pumping water from under concrete slab basement

I have this situation, and wanted someone's opinion. Info: Concrete foundation basement, slab floor Weeping tiles and a sump pump is present / operational The house is near a pond. Grading is alright,...
174 views

### Calculating the plastic section modulus, Z, of an arc of a circle

I am trying to find a simplified formula for determining the plastic section modulus, Z, of an arc of a circle. In my case, I have a 20" diameter 0.375" thick pipe and I am cutting a 6" ...
85 views

### How does the maintain load test work?

A project site in my company is currently working on testing the settlement of our piles using the maintain load test, so my boss is asking me to find out some information on this. In particular, he ...
54 views

### Computing the velocity of water under reverse flow conditions from storm water drain

I am trying to compute the approximate velocity of water during reverse flow from the outfall location to the street through storm inlets. This is generally seen during what is commonly referred to as ...
1 vote
100 views

### What specification describes best a bulldozer "strength"?

Bulldozers are tracked-type tractors designed to push soil and heavy objects. In a typical specification sheet, the following are listed: Flywheel power (hp or kW) Gross power (hp or kW) Engine ...
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