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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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. ...
Dima's user avatar
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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 ...
Michael Altfield's user avatar
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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 ...
Anonymousstriker38596's user avatar
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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 ...
talalalal's user avatar
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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
TEJ BAHADUR KARKI's user avatar
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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 ...
Wyatt Sutcliffe's user avatar
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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 ...
Stéphane Gimenez's user avatar
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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 ...
JJrodny's user avatar
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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 ...
The_Anomaly's user avatar
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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 ...
James's user avatar
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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 ...
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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 ...
john_smith's user avatar
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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 ...
Hugo Bethancourt's user avatar
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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?
Will Kent's user avatar
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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-...
Mohammed ALabdrabalnbi's user avatar
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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 ...
gaby's user avatar
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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 ...
john_smith's user avatar
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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?
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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 ...
Megidd's user avatar
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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,...
CrazyFox01's user avatar
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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" ...
TheSpareBoot's user avatar
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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 ...
Kevin Halim's user avatar
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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 ...
user1889930's user avatar
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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 ...
Triceratops's user avatar
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Adding traffic lights to a junction, what is the logic of using lights with arrows?

I'm doing a job and one of the feature is adding realistic traffic lights to junctions of a network and I have to be very specific. So, if on the ground there are arrows signaling the traffic flow (e....
Claudio Kerov's user avatar
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2 answers
116 views

Lateral load calculation at the bottom of an arch

I am trying to find out how much lateral thrust an arch produces when applying a load evenly distributed across its span. There are a lot of 'complex' models around and full analysis done case by case ...
Redirectk's user avatar
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How is a room structurally suspended above a garage cutout?

The garage of this cavity wall (outer brick layer wall, inner concrete load bearing wall) new build uk house is a cutout directly below a room. i'm confused because this obviously interrupts the ...
jg mr chapb's user avatar
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What width gate for parking 4m car at 90degrees in 10ft offset in front of home?

I have 10x30 feet offset in front of my house where 30 feet is the width of my house. The road in front of house is 20 feet wide (but I can't park on road). I have a bought a 4m long car (MarutiSuzuki ...
Ghanendra's user avatar
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Is it more difficult to cut a single steel column, or a wire of the same width made up of several skinnier, individual wires?

Would it be more difficult to cut a single 15.75" column of solid galvanized steel, or a 15.75" wire made up of 5,282 individual strands, or would it be the same? The wire in question is the ...
Curious Layman's user avatar
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HEC RAS and storm sewer

It is required to simulate the surface runoff in the city on the basis of the DEM and see how well the storm drains are coping. But I do not know how to make a water intake not from the edge of the ...
Константин's user avatar
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2 answers
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Secondary glazing 16 to 20cm away from double glazing

I have double glazing (optimized for sound protection) on a 2m-by-2m window. What would be the effect (sound insulation and thermal insulation) of an additional layer of glazing about 16cm away from ...
H A Helfgott's user avatar
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Ratio of length to baseplate bolt pattern to assume that a joint is pinned

I have a truss tower that is attached to a hoist arm by a baseplate. The truss tower is 80ft long and the bolt pattern of the baseplate is a 1ftx1ft square. Is it valid to assume that the joint ...
Nachiket Adhvaryu's user avatar
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1 answer
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Rotation of a tube

See image... why is it that in part 1 the answer is negative but in part 2 it is added instead of subtracted? I thought because I got a negative in part 1 I would have to subtract in part 2 but the ...
user22718620's user avatar
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1 answer
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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 ...
Enrico's user avatar
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2 answers
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Can we use ion thrusters in space to relieve tension on a space elevator cable?

I suspect/hope I'm not kidding myself too much with the physics of this; it seems to stack up in my mind; but can we not relieve tension on, say, a steel cable running from a space station in orbit ...
Sam Cottle's user avatar
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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 ...
inquisitive learner's user avatar
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Bolt tensile load through an "intermediary"?

Following up on this question, does it change anything if the bolted arm is an intermediate arm (e.g. some sort of mating interface like below)? That is, the arm receiving the load is connected to the ...
TechieJ's user avatar
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The heaviest road-legal truck

The question is what is the heaviest road-legal truck? I exclude road trains (except for one full trailer in addition to regular load) and special payloads (such as wind turbines, very large ...
Triceratops's user avatar
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Concrete block VS Red brick for Kitchen extension

Is the wall composition/layers the same if I were to choose either Concrete block or Red brick? Which has a higher strength? Which is generally more preferred for extensions? Note please, this is for ...
Jamie's user avatar
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How can depth of flow in a supercritical flow get affected when the flow passes through a constriction of width less than the critical width?

When a supercritical flow approaches a constriction having a width less than the critical width does the depth of supercritical flow decrease upstream so as to increase specific energy? If it does ...
inquisitive learner's user avatar
2 votes
2 answers
117 views

What are these objects attached to the cables of this bridge?

Recently, I noticed some strange objects attached to the cables of a bridge (in Münster, Germany): What are they called and what is their purpose? They don't look like connectors of any kind nor do ...
BridgeFan's user avatar
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1 answer
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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 ...
mantissa's user avatar
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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 ...
Bilgehan Yılmaz's user avatar
1 vote
2 answers
130 views

A question on understanding the nature of static equilibrium

In the statics lesson, we do not think about the effects of forces on objects. In other words, we do not assume that an object can break, bend or twist. In the same situation, we can combine different ...
Bilgehan Yılmaz's user avatar
1 vote
1 answer
186 views

Are the compressive and tensile stresses in the beams always equal?

If we examine the $example-1$ of cantilever beam 1 above, there will be shear force $Ft$ and moment $M$ that will keep the beam in balance statically. However, when we examine the strength, that is, ...
Bilgehan Yılmaz's user avatar
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What is collapse multiplier in OptumG2 software? How to reduce the error percentage for calculating active Earth pressure?

I am working on an analysis of a retaining wall. After doing a limit analysis on the structure, the collapse multiplier that I am getting for both upper and lower limit is very high. As it is not ...
Saswati Das Choudhury's user avatar
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Fixed End Moment for a point load at edge span

Usually, i solved this kind problems by divide into 3 span, AB, BC, CD Then, using Fixed End Moment and Cross Methode to find the Moment But, i cant find Fixed End Moment for the point load at the ...
Luis's user avatar
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2 answers
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Can I modify the roof trusses in my barn to raise the roof

We're trying to raise the roof on our 1.5 storey pole barn. We're intending on just replacing half the roof as shown below. each truss is supported by 4x6 columns (the long side of the 4x6 is bolted ...
Joe B's user avatar
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Thermal Expansion and Stress in a Heated Beam

Consider the case of a beam that is supported in such a way that expansion can occur freely. Suppose that the beam is heated in such a way that the temperature varies with the depth of the beam. Let $...
CrystalTerry's user avatar

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