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.

Filter by
Sorted by
Tagged with
0 votes
1 answer
95 views

Rectangular pressure vessel

I'm trying to find a theory reference for stress and deformation analysis of a closed rectangular pressure vessels with constant thickness subjected to pressure loads. By now, my test case would be ...
0 votes
1 answer
13 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. ...
0 votes
1 answer
182 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 ...
0 votes
1 answer
33 views

why are horizontal and vertical stresses on an element in soil mass considered as principal stresses?

Despite the fact that there are shear stresses also involved while considering deformations in soil why are the horizontal and vertical stresses on an element as shown in below figure considered as ...
2 votes
2 answers
205 views

How to design an enclosure around the load cell (Beam type)?

Hardware and Electronics Used: Arduino UNO, HX711 ADC Load cell amplifier, Load Cell (2Kg); Currently, I am working on a project which requires me to put load cell along with the other circuitry in an ...
0 votes
2 answers
69 views

Understanding forces acting on solids

I've just started learning about axial stresses on solids, primarily soil samples and this is the first time I've encountered proper forces on solids, and we consider this over an area, previously I ...
0 votes
1 answer
43 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 ...
0 votes
1 answer
66 views

Laying problem in designing axis points in static design?

First of all, there is a simple pattern plan on the halter. Here, we design an axis point passing through the midpoints of the columns and use it in the static calculation program. However, when we do ...
0 votes
1 answer
38 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 ...
0 votes
0 answers
49 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 ...
0 votes
0 answers
35 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
4 votes
7 answers
2k views

Does the speed of Heavy Vehicles make more potholes

Should Heavy Trucks drive more slowly on weak (bitumen) roads to reduce potholes in the road surface? I am discussing with a feasibility engineer what causes more potholes. He says it is simply the '...
0 votes
0 answers
21 views

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 ...
0 votes
1 answer
35 views

Difference in seismic analysis of RCC structure and an equipment

I am a chemistry/metallurgy major and working on qualification of mechanical components (pressure vessels, closed leak tight enclosures, cells at high temperature etc.) and this is my first question ...
1 vote
1 answer
156 views

How to professionally mount an air duct through a core hole in limestone brickwork

We need to add ventilation holes to an existing building. The holes will be core-hole drilled through a limestone brick wall. The bricks have crevices. The contractor is acting stupid and obstructive ...
-1 votes
1 answer
68 views

Hydrostatic force acting on a hemispherical impression

Consider vertical wall which contains a hemispherical impression as shown. Water is filled only upto the centre of hemispherical impression, i.e. to a depth of L. It is required to know the horizontal ...
0 votes
1 answer
73 views

Hydraulics sluice gates and hydraulic jumps

I was wondering if anyone has an understanding on hydraulic jumps and sluice gates? Why can you only use the energy equation for before and after the sluice gate? Why not at two points after the ...
0 votes
1 answer
438 views

Mechanism and static determinacy

I was doing exam question and am confused as to how to determine if the structure is a mechanism or not. Say that j = number of joints, r = total number of reactions, b = number of bars. For both (a) ...
0 votes
4 answers
282 views

How do you simplify this load diagram?

Very rough sketch but I'm having trouble with a Shear and Bending Moment problem, and I'm pretty new to the topic. This is the original diagram: I already simplified the left side (not sure if it's ...
3 votes
2 answers
556 views

Why do all high-speed trains run on electric track (as opposed to normal track with diesel-electric trains)?

AFAIK, all high speed trains (200+ kmh) run on electric track. Why is this? Is there something about a diesel-electric engine that makes high-speed trains more difficult? Here's some other data, and ...
3 votes
3 answers
167 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 ...
4 votes
1 answer
107 views

Is there a name for a structure/building technique comprising three arches that share a central column? (Answer Found - Triple Arch System)

I saw a few minutes of a documentary that mentioned the domed roof of the largest mosque in Istanbul is supported by the strength of sets of three arches assembled so they share a common pillar. I'd ...
0 votes
1 answer
82 views

Why do governments prescribe maximum ground coverage restrictions / building coverage ratio?

I am an social science grad student who is writing a paper on the economic analyis of building regulations. While I could find quite a bit of literature on setbacks and floor area ratio , I couldn't ...
0 votes
1 answer
276 views

What is the equivalent rotational/angular stiffness of a beam

I'm trying to model a larger system and working through a conceptual issue. I'm familiar with the concept of expressing the stiffness of a beam as an equivalent spring stiffness like in the image ...
1 vote
3 answers
917 views

how to determine the direction of support reactions in a truss?

Hi, I am not sure how to determine the direction of support reactions at point A and K. I know point A has a pin support, therefore, it can take in horizontal and vertical loads and point K has a ...
0 votes
1 answer
179 views

Degree of Kinematic Indeterminacy

Is the degree of indeterminacy 3 in this structure? How to clearly determine DOKI of a structure? I am confused to determine whether hinge D can allow rotation to occur in this diagram. Rotation: at B/...
2 votes
2 answers
1k views

AISC 360 vs AISC 341

I have been trying to determine the response coefficients for seismic analysis of Non building structures in ASCE 7-10 and found that the value of R, the response coefficient, is larger in case steel ...
0 votes
1 answer
35 views

Typical Runoff velocity values

I am computing runoff velocities for rainfall falling over an area using St-Venant 1D momentum equation. I wanted to have some idea if my computed velocities are within a reasonable range of what one ...
0 votes
1 answer
245 views

Calculations of Retaining Wall

If I have to find the maximum bending moment of this retaining wall, is the maximum bending moment located at the toe? If not, where is the location of the maximum bending? In order to find the ...
0 votes
2 answers
69 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?
1 vote
2 answers
64 views

Is there a specific way to simulate porous structures?

I tried to simulate an axial compression test for a lattice (porous) structure but It takes too much time and it doesn't give me the right answer (when I compare with experimental results). So, I was ...
0 votes
1 answer
80 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 ...
0 votes
1 answer
57 views

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 ...
0 votes
1 answer
88 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" ...
0 votes
0 answers
28 views

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 ...
0 votes
2 answers
50 views

Convention for describing infrastructure: From south & west to north & east

When textually describing the extents of infrastructure, such as the roads with red markup in the map below: Is there a civil engineering convention for the order/direction in which we would describe ...
0 votes
1 answer
90 views

"Slender" Column in bridge design

I am currently designing a cable-stayed bridge and my design gave me a 45x50cm column. But now that I see my column's unsupported height is 7m. I checked for slenderness and it is of 93. Now, ...
0 votes
2 answers
34 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 ...
0 votes
0 answers
21 views

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 ...
0 votes
1 answer
131 views

Why is the unit load facing upwards? Flexibility/Force Method

I used the flexibility method to solve questions like this, so I know you have to have a primary and secondary structure. My primary structure looks like this: So if I apply my virtual load, I got ...
1 vote
1 answer
37 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,...
0 votes
1 answer
61 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 ...
1 vote
4 answers
79 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 ...
0 votes
1 answer
234 views

Linear Motion Stage with Offset Loading Problem

I'm currently developing a linear motion system which will have to withstand a large offset load (see image below). There will be two rails, each with a carriage on, which will be connected by a beam/...
0 votes
0 answers
18 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 ...
7 votes
2 answers
637 views

Industry standard factor of safety for ballast design

What design standards exist for the design of ballast against uplift forces, and what factor of safety against uplift do these design standards promulgate? I am familiar with a typical FS of roughly 1....
3 votes
1 answer
3k views

What are the solutions to water problems in a retaining wall

What are the construction procedures that allow the mitigation of potential problems due to water in a retaining wall? To be more specific: I'm talking about reinforced concrete walls. The cases of ...
0 votes
1 answer
25 views

Searching for geometric modeller to investigate behaviour of beam when deflected

I have the scenario where I wish to model the movement of a simply supported beam under a central point load. I've done some stuff in R Studio to come up with deflection plots and that's fine. In ...
0 votes
5 answers
208 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 ...
20 votes
3 answers
541 views

Is there a method to determine the runoff for arid areas in developing countries?

Note: this question was totally rephrased and expanded on, addressing the comments and questions posed to the first version. The de-facto standard source for runoff calculations in South Africa is ...

1
2 3 4 5
18