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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10 views

3 x 1 stone under footing and sump crock

I am having a house built and the builder found organic soils during the excavation. They removed the soils and then filled the cavity with 1x3 stone (see picture). This is the corner where the sump ...
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34 views

Do you need to be a chartered engineer to submit structural calculations to building control in the UK?

I’m a graduate structural engineer with 4 years experience, working in the UK. A family friend is planning on doing a house extension which will require some structural calculations for steel beams. ...
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21 views

Heat transfer Chemical Engineering [on hold]

could anybody please help me with these two questions, i have been stuck on them for a very long time Many thanks]2
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1answer
60 views

Looking to design a cantilever support to hold up an 80kg projector

I need to make a support (preferably metal) for a projector to be fixed on the wall. The projector size is: Width: 0.7m Length: 1.1m Weight: 80kg If anyone knows how i can solve this please let me ...
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1answer
34 views

Can a horizontal foundation safeguard against earthquakes?

I have not taken any course in civil engineering. What I was taught was that a broad base would prevent something from toppling. So it makes me wondering instead of nailing the foundation of a ...
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1answer
90 views

Is it OK for a 2 story house not have a column or pillar

sorry for my english. I was looking to buy a house. I saw some in my hometown, which is very affordable. but on a picture of the house they are selling I found on the net troubled me. no pillar/column,...
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2answers
48 views

Identifying Compression and Tension as well as Hogging

Im looking for clarification on how the solution identified the moment to be hogging, as well as the axial stress to be in compression? Also I'm confused as to how the solution came to a conclusion ...
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1answer
33 views

Max compression & Tension

I'm seeking an explanation in reference to the photo below. I'm unsure how the solution within the red box calculates the max tension of the Aluminium beam and the max compression off the Aluminium ...
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1answer
102 views

Max Tensile & Compressive Stress Question - Identify the equation

I'm struggling to identify which equation is used within the first red square. Could someone please help identify which equation was used as well as why? Thankyou!
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1answer
39 views

Water in basement plug install

I have a basement which floods, the water comes through a drain in the floor. I am therefore looking to use an HFT Pipestoppers to stop the water coming in I think the water comes from an old tank (B)...
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46 views

How were horizontal and vertical structures ensured in old times?

In modern times bubble levels and water levels are used to check if a surface if strictly horizontal/vertical. How did people ensure vertical/horizontal surfaces in older times?
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1answer
66 views

Cooling tower for nuclear power plants

Cooling towers for nuclear power plants often have the shape of a hyperboloid. At first glance, I thought that an obvious reason for this would be the smaller sectional area, meaning the tower would ...
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43 views

How do i find the effective length factor (k) for a column from this chart?

I need to find the effective length of a column (kl) from this chart which can be found in the "design of concrete structure" By Dr. Arthur Nilson. the question states "if Psi top is 1.5 and the ...
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42 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 ...
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1answer
48 views

What is the axis of a pipe?

Sorry, it seems like the answer to this question is just a quick google search away; but I have not found a page defining what the axis is. My guess was that the axis of a piple is the imaginary line ...
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30 views

Along which direction is the area moment of inertia taken in bending moment equation?

Is it in the same direction of the applied load or in the co-planar perpendicular direction to the load applied?
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70 views

Truss Analysis Problem

In this case, L, theta and P are given, there will be 4 reactions at the wall? (2 horizontal and 2 vertical). $$\begin{align} \sum F_v &= 0 \therefore F_{v,B} + F_{v,A} = P \\ \sum F_h &= 0 \...
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1answer
62 views

Maximum tensile and compressive stress in a T-beam

Where does the T-beam come from? There's just a straight beam resting on two supports. And where do 10 and 80 come from? I am so confused.
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1answer
43 views

Determining the direction of internal forces in a truss

I am learning the method of joints, but there's no explanation on how to figure out the direction of internal forces in my course. How do you know that BA is tension and BC is compression?
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1answer
117 views

Is Scrooge's giant glass dome feasible in real life?

In an Uncle Scrooge (or Scrooge McDuck, not sure of the translation here) comic named "Treasure Under Glass", Scrooge orders a giant glass dome to be manufactured in order to aid his endeavours ...
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2answers
58 views

Comparing the precision work of plane surveying and geodetic surveying

In geodetic surveying, we consider the spherical geometry of the surface though the surface is not perfectly spherical. In-plane surveying, we consider a small surface area which is considered as a ...
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1answer
85 views

How will using desert sand instead of concrete sand affect my concrete recipe?

I've read that desert sand is too round for concrete mixes. But, I'm not building a dam, I'm building a 3 foot landscaping wall. I'm interested in using desert sand for the color, so this is an ...
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24 views

What injectors are typically used for mixing sewage sludge?

One typical way to heat sewage sludge digesters is to pump the sludge through heat exchangers, raw sludge is injected before or after the HX. What kind of injectors are typically used for this? I'm ...
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1answer
37 views

The formula for partial flow of Box Culvert

Refer to this document, and particular to Figure 2: I wonder what is the formula that governs the box culvert partial flow with respect to full flow? In other words, base on what formula the above ...
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27 views

Static balancing of link mechanism

So I'm trying to get to the condition as shown in the picture below, where it says that if we have zero free length springs and k1r2=k2r1, then any configuration (pose) of the link is in equilibrium. ...
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36 views

Eulerian description of fluid flow

In Eulerian description of fluid flow, we observe how the properties of the fluid are changing at a point. Since a point has zero dimension hence a zero area, how can we make sense of the 'finite ...
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33 views

Command line Macro?

AutoCAD 2017, Civil 3D - I have gone into "customize user interface" and created a new command. What would the Macro be to simply select a 3D polyline in the shape of an "L" and turn it into a square? ...
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51 views

What is the best approach to fix empty pockets in a concrete slab/wall

What is the best approach to fix the pockets seen below: The pockets were due to the stones in place which did not allow to pass the concrete material, and later on gravity made it's way. Options on ...
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2answers
94 views

Indeterminate beam with a guide at each end

I've been battling with a statics question (as attached) and can't for the life of me figure it out. I've attempted removing the left side guide joint so then there are only 3 reactions and it should ...
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2answers
54 views

Direction of the resultant force in hinge supports

In my lecture material on different types of structural supports, there is the above picture of a hinge. It is explained that a hinge is a type of support that exerts no moment on the rod, but ...
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2answers
63 views

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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1answer
87 views

Is a granite block tunnel longer lasting than reinforced concrete? [closed]

Assumptions Building Process exists Waterproofing is able to be replaced Notes Please answer yes or no with the science backing. This question is only about the strength and lifespan. This ...
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2answers
103 views

How do I calculate the reactions in this truss?

How do I calculate the reactions in this truss?I would usually cut in the joint where beams 5,6,7 and 8 are and calculate reactions in the two trusses that are created.How do I do that when there is a ...
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1answer
18 views

Drucker-Prager Model Parameters, a Proper Choice

My task is to write a code from scratch for 3D elastoplasticity, namely a DP model (see for example DeSouza Neto, et al., 2008, Chapter 8) having yield surface $$ f(\mathbf{\sigma},c) = \sqrt{J_2(\...
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35 views

Can I use grout as mortar?

I have one tile that came off. I got a replacement tile, and some grout. But the online guides say you need mortar to glue the tile to the ground. Can I use the grout as mortar? I want to save money ...
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20 views

What states other than California require less than 4 years of experience in order to obtain a PE license?

Do any states other than California require less than 4 years of experience to become a registered Professional Engineer?
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1answer
16 views

Finding Stress Concentration Factor when (D/d) ratio is not on a table?

So we have this homework problem, it is a rectangular filleted bar and we have to find the minimum thickness. I go and calculated the ratios but here's the problem: (D/d) = 1.375. What may the problem ...
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1answer
38 views

Finding good and effective solution for overhead RCC slab spalling due to corrosion in Rebars [closed]

Please suggest some effective repair solution for spalling overhead slab due to high corrosion in rebars.
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1answer
34 views

Soil mechanics-Geotechnical engineering [closed]

Which is more economical to improve or change the soil that is used to build a structure? my answer is that it depends on each case, but I would like to get more information, or where to search about ...
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What approaches are there for demolishing a structure and how is an approach chosen?

From my office on the 21st floor of a building in Vancouver, BC two parking garages in the process of being demolished are visible. A third is just out of view a few more blocks away. One of these ...
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1answer
22 views

Centroid and toppling [closed]

A uniform block is in the form of a square ABCD of sides 2 m and a unit thickness. E is a point on AD such that ED = xm. The portion EDC is then removed from the block. What is the maximum value of x ...
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31 views

Why do auxetic materials have higher energy dissipation rates

Below is an extract from a thesis called "Auxetic Structures: Towards Bending-active architectural applications" on page no. 80. In a NPR (Negative Poisson's ratio) material the energy ...
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2answers
53 views

Does the pressure due to corrosion in concrete depends on degree of corrosion?

I am trying to relate the degree of corrosion with the pressure exerted in surrounding concrete. My common sense tells me that higher the degree of corrosion, higher should be the pressure exerted, ...
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1answer
50 views

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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2answers
98 views

How does one build a waterproof basement?

I have been doing a bunch of research online into how to build a basement that is below the water table. The common wisdom is to "not waste the money doing that" but as someone who doesn't like to be ...
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55 views

Why do normal tunnel boring operations not use the dirt (from the boring itself) for reinforcement rather than bringing it from other sources?

According to Elon in this video (@13:06), he states that the reinforced segments are 70% just dirt, but in normal tunneling, they actually truck the dirt out and bring new dirt in which seems very ...
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How much seawater could be desalinated using the waste heat from a powerplant?

I've done some rough calculations on how much water could be produced by using the waste heat of a powerplant to boil seawater. I'm interested in a ballpark figure and would like to know if I have a ...
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50 views

FEA using abaqus, and it does not follow the trend

I am doing finite element analysis of a donut shape for my school work. I'm increasing the thickness of the object with a 1 mm increment and run FEA each time, and then comparing the maximum ...
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Drinking Water Treatment R&D: Mechanical or Civil Engineering Degree? [closed]

I will be a freshman in University next year. After graduating, I would like to get a job in the R&D sector of drinking water treatment technologies. I'm unsure if I should get a degree in ME or ...
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Research based bridge project? [closed]

I am a fourth year civil engineering student at IOE pulchowk, Nepal. In our syllabus one practical based curriculum called Project Engineering has been added. I, along with 5 friends, are interested ...