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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Characteristics of geogrid/geotextiles for not civil engineering usage
I'm looking for a sheet good material with the following characteristics. The object to find a better material for making trampoline beds.
High porosity: Ideally at least 70%. Bottom end 45%
Mass ...
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Calculo de resistencia ao cisalhamento - Madeira
Uma estrutura será construída com uma madeira proveniente de uma espécie de conífera.
Foram realizados ensaios de compressão paralelo às fibras que resultaram em um valor de
resistência médio de 41 ...
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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 ...
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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 ...
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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 ...
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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 ...
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How to calculate the Power requirement of a traction motor when uses counter weight in case of lift 🛗 [closed]
Just include the process step by step and the required equations, if needed for any step.
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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 ...
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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/...
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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 ...
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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 ...
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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 ...
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"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, ...
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How deep are utilities typically buried?
What are the recommended or relevant standards for US city planning with regards to depth ranges for various utilities such as water, natural gas, and power, as well as for subway or rail, etc...?
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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 ...
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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 ...
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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 ...
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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/...
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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....
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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 ...
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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 ...
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Dlubal Rfem Seismic Analysis
I’m learning Dlubal Rfem recently and I have a problem about seismic analysis. When Equivalent Lateral Load is bigger than Modal base shear;for example on Sap2000 we scale modal base shear and we make ...
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How can I eliminate oscillations in Sim-Routing for HydroCAD?
I am currently attempting to model a stormwater system that has a high likelihood of backflow because the proposed basins are interconnected and there are no intervening structures which would impede ...
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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 ...
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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 ...
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Once stopped, is it possible to achieve full cement hydration?
Several sources state that if hydration is stopped during cement curing, is not possible to resume it, and final strength will be compromised. But so far, I haven't found a reliable explanation.
I ...
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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 ...
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Is it possible to use Plain Cement Concrete post for fencing?
I am in need of around 700-800 posts to fence my farm in a semi-arid area in TN state, India. In my place granite posts mined from quarries are normally used. It costs around Rs 300-400 per post(6-7ft)...
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Inverse analysis of one Storey structure
The displacement history of one story structure is known due to an unknown ground motion. The dynamic properties, such as mass and lateral stiffness, are known, and dimensions were also given. How to ...
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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.
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Doubt related to venturimeter and manometric fluid
I am unable to understand why the manometric fluid do not flush off due to high pressure fluid flowing through pipe? Because as discharge increases pressure drop will increase so manometer should show ...
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Is it possible for a silt soil to be compacted hard as a rock?
I had been told that a silt soil, when professionally compacted (from all the laboratory essays to the compaction with a vibratory roller), ends hard as a rock, and when hit with a metal bar it makes ...
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Statically determinate system
The exercise is taken from linear algebra and its applications, prof. G. Strang
Exercise 2.4.8 Truss
I have already found that: m=n=8 → system is statically determinate, therefore solvable by ...
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Waterlogged multistorey apartment
I fraction invested in a real estate project several years back. Mid way through the construction, after about 12 floors, the building contractor filed for bankruptcy. An asset reconstruction company ...
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Liquid splashes - who researches it, and why don't all urinal mats look the same?
I normally wear shorts in the summer, at which point I become very aware of the problem every man knows about - splashback of pee from urinals. No matter how you stand or aim, the inherent splashing ...
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Finding the velocity of water flowing through a gravel filled pipe
I have a scenario where I have water flowing through a gravel filled pipe, and I need to find the velocity. The pipe is gravity fed (no pumps). My approach is to find the seepage velocity ($V_s$) ...
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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 ...
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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 ...
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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 ...
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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 ...
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Calculate the Euler buckling load of a column using the finite element method
I am trying to find the buckling load of following column:
I started from the system of equations $P = (K + K_g(N))U$, where $K$ is the stiffness matrix of a single 2D frame element and $K_g$ is the ...
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Difference between elastic and inleastic response spectra?
As far as I know inelastic response spectra is supposed to consider the geometric distribution, in plan and height and also the importance, nonetheless this concept is a little vague and I could not ...
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Timber strength in tangential and radial directions
Normally for structural timber, two values for compressive and tension strength are given. One value is given for timber in direction of the grain, and other is given at 90 degrees (perpendicular) to ...
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What are these "water fountains" in the middle of a river in North Korea? (Probably also found elsewhere.)
While watching a video of somebody flying an airplane over North Korea, I noticed in a river these two "water fountains":
I vaguely recall seeing this previously, probably in the US, as well. My ...
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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 ...
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TMT Steel in layers
The Site Engineer and I were arguing about the placement of the reinforcement bars in layers. The Steel technician (TMT) placed the third layer of reinforcement in the 2nd layer. I said it didn't ...
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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 ...
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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 ...
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What is a good sensing element to monitor corrosion in a bridge structural health monitoring system?
The question relating to measuring structural integrity of bridges brought awareness to six categories of structural health monitoring of bridges. They are
Bridge foundations
Concrete ...
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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, ...
