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
0answers
18 views

Type of mortar question [closed]

What type of mortar to be used for historical building? Is it low strength mortar? Historic mortar? Are they both the same? How about type K? Or type O mortar?
0
votes
0answers
10 views

How to model leaning columns in opensees?

I want to modelling three buildings next to each other in opensees software . Duo to modelling leaning columns , buildings overlap with each other . Now my question is that for 3 adjacent buildings ...
-1
votes
0answers
61 views

Swimming pool design and construction in Express Train coaches [closed]

https://en.wikipedia.org/wiki/Express_train Is it feasible to design & construct Swimming pool in Express train coach or coaches? Will it be challenging to design & construct a swimming pool ...
0
votes
1answer
39 views

How to solve this displacement problem

I have to solve this question, and I've tried multiple things with the angle and displacement but I just cannot figure it out. I started with a M/EI diagram and i went from there. Any tips on how to ...
0
votes
0answers
28 views

Lifespan of steel frame houses

We are considering to build our family house. Where I live, people build either: Concrete beams for the structure and then thermal bricks for the external walls; or, Heavy duty steel structure and ...
0
votes
3answers
40 views

Why is there a difference in the deflection between the top and bottom of this truss?

In this truss scenario, why is the deflection of point 3 less than that of point 8? I'm assuming it has something to do with the shape of the truss. If we extend the shape we will get a circle and the ...
3
votes
2answers
36 views

Low pile capacity during pile driving

When driving piles, the resistance from the soil is constantly measured. What happens when the expected resistance values from the soil are not obtained? For a single pile or for multiple piles? What ...
-1
votes
0answers
13 views

Tangent matrix terms in Abaqus UEL

I have problems in the calculation of the tangent matrix terms in an Abaqus UEL subroutines, do you have suggestion on how to take tensor derivatives? For example: $$ \frac{d\underline{\underline{T}}}{...
3
votes
1answer
51 views

Maximum hole size in brickwork before a lintel is required

Holes are made in brickwork walls for all kinds of reasons including gas flues, to route cabling and to fit windows. At some point that hole gets large enough that a lintel is required to support the ...
-1
votes
1answer
36 views

Tensile Strength Of Concrete For RCC Structure [closed]

In the design of R.C.C. structures, what should be the tensile strength of concrete?
-1
votes
2answers
40 views

Other than yielding, what type of stress you check for ASD?

ASIC 360-16, in page pdf 330, it says "For any single element, there may be a number of different allowable stresses that must be checked." I can think of yielding. What else? Rupture for ...
2
votes
2answers
34 views

Stop Spa-to-Pool Siphoning Thru Spa Pump

I have a partially above ground Spa and an in-ground pool. When the spa is filled to spillover with pumps off, water siphons through the spa pump and into the pool until the spa water level drops ...
-1
votes
1answer
29 views

Pipe Invert Elevation

Can someone please help and explain if the invert elevation of the pipe is calculated as 192+2+10? or 192+2+10+0.6667 (8" pipe)? Or 192+2+10+1 (measured to bottom)? Sketch is not to scale.
3
votes
4answers
83 views

Speed breaker design

Speed breakers are safety devices that keep check on the fast-moving traffic. But what does the speed breaker do when the vehicle is already slow approaching. Is there any better breaking system ...
0
votes
5answers
74 views

Why do dams deplete rivers?

I have often heard of cases where dams reduce the flow rate of rivers downstream. This makes sense in cases where some of the water that is captured by the dam is used for irrigation and such, but in ...
1
vote
0answers
38 views

What is this 'timber insert' on the construction drawing of a concrete parapet wall?

A sectional elevation of a concrete roof is shown below (drawing is from the early 70s): The roof slab is dimensioned as 6" thick with what appears to be 12" parapet wall with a 'Timber ...
4
votes
3answers
80 views

Trapping heat by curing of concrete under plastic sheets

Although curing of concrete under plastic sheets is a recognized technique, I have some doubts about it. I think that the plastic sheets may trap heat coming from the exothermic reaction, which will ...
0
votes
1answer
60 views

What specific technical concerns exist for China's Three Gorges damn on the Yangtze river?

Recently, many people (specifically geopolitical and financial analysts) have pointed out that there is a serious concern about China's Three Gorges Dam breaking and causing catastrophic flooding that ...
2
votes
2answers
50 views

How is electrical building code defined and applied to new constructions?

A new home (completed in early 2020) in San Jose California does not have GFCI outlets in all the bathrooms. I thought this was a requirement (according to https://www.redwoodcity.org/home/...
0
votes
1answer
47 views

Single shear bolt shear force and moment diagrams

I’m trying to determine what the shear and moment diagrams of a bolt in single shear look like. Before anyone says it, I know that it’s rare that a bolt will ever fail first in bending, and this is ...
3
votes
2answers
49 views

Tiled/block pavement used to pave high traffic roadway?

We're normally paving the high-traffic road with concrete or asphalt. While for sidewalk/garden, we use pave block/tiles (either concrete or else) Common reason is because pave block/tiles doesn't ...
2
votes
0answers
56 views

Any Idea of This China's “Transparent Concrete”?

I am currently make an attempt to make miniaturized version of this China's solar highway on my garage https://www.youtube.com/watch?v=zK8FvzI3yDA Just so i can re-evaluate the performance However, I ...
2
votes
3answers
87 views

Difference between Linear Force and Force about an Axis

I am confused between How forces work when applied in singular linear direction vs Force Applied to a continuous mass about an axis(example to rotate it). Example 1: Consider an object of mass $m$ ...
1
vote
2answers
72 views

What is the purpose of those “dual parasols”?

Watching a live video stream from South Korea just now, I noticed these parasols in the background. They look like normal parasols but have two "layers". Like a hole in the top with another &...
0
votes
0answers
39 views

one question regarding bottom up fatigure cracking

We have uploaded PMS database with bottom-up fatigue cracking in csv. and PMED in dgpx. file into CAT program (Calibration Assistant Tool) trying to do the coefficient optimization. However, at the ...
0
votes
0answers
14 views

Looking for sources of information regarding story of resilient design in Japanese nuclear power plants

I recently listened to podcast (not sure what podcast, it came up in my feed while driving). There was in interview with an author of a book. The author told a story about the design of nuclear ...
1
vote
1answer
48 views

How do I calculate the density of a lined pipe?

I'm having some trouble figuring out how to calculate the density of a lined pipe given the diameter measurements and the specific gravity of the materials. The Problem Calculate the density of an ...
2
votes
2answers
78 views

What is the technical name for temporary construction fences?

My structural engineering friend and I passed a construction site years ago, and he called those temporary fences a technical name. Now I ask him the technical name he said those years and he doesn't ...
4
votes
0answers
125 views

Conservative rebar dowel hole sizing and embedment depth

My question concerns the hole sizing and embedment depth of post installed rebar which is secured with epoxy mortar into a hole in a reinforced concrete slab. Hole diameter sizing My assumption #1 ...
1
vote
0answers
20 views

What are the hypersonic Normal shock relationships?

I am learning about hypersonic flow now and there seems to be a lot of discussion about the oblique shock relationships as the Mach tends to be very large. I was wondering what happens to the normal ...
0
votes
1answer
47 views

Missing items in geotechnical reports [closed]

In your experience, what items that should be in geotechnical reports are sometimes missing, and what do you do in that case, can you provide example? Do we look at codes or make best guess and based ...
1
vote
1answer
41 views

Structural design approaches ASD or LRFD

I have several questions regarding terminology as I get confused reading different sources. What I learned so far: ASD is also called WSD (working stress design) LRFD is also called Limit State ...
0
votes
3answers
116 views

I can't even see how can i solve this truss question

I can't even see how can I solve this truss question I'm an engineering student, our professor assigned us this truss problem. I have found an answer saying that it is a zero member. I have tried ...
4
votes
2answers
420 views

In a reinforced concrete detail drawing what does 'reinforcement to be GK 60' mean?

Consider the following extract from a British reinforced concrete drawing from 1970: It states that 'REINFORCEMENT TO BE G.K 60. UNLESS STATED OTHERWISE' What is the meaning of GK 60? What property ...
1
vote
2answers
56 views

A statics problem containing a distributed triangular load and a linear load

I have came across this problem and I couldn't figure it out I have used the following equation $$\begin{align} y &= 6 - \dfrac{2}{3}x \\ V &= 26 - \dfrac{2}{3}x^2 \\ M_x &= 26x-\dfrac{...
1
vote
2answers
63 views

How do you find the resultant hydrostatic force on a curved surface which is not exactly semicircle

Assuming this is a pressurized chamber with hydro-static force acting on a semi circle stuck in a surface: To find the resultant force, I would first divide the semicircle into half. Pressure on ...
1
vote
1answer
44 views

Plastic hinge locations in pushover analysis

In pushover analysis, why do we force the plastic hinge locations, such as indicating in our model instead of waiting for them to occur naturally? Also, do we usually need to show the spread of ...
0
votes
2answers
54 views

Boundary conditions for this beam deflection problem

consider the diagram above. I know that deflection is described by the equation $$EI\frac{d^4y}{dx^4}=p(x)$$ where $L$ is the length of the beam, $E$ is the Young's module, $I$ is the moment of ...
-1
votes
1answer
32 views

Method of joints not working on simple truss, supposed to be stable and determinant

In the process of editing the question to put better pictures of my dimensions in, I realized that how I calculated my angles was incorrect, and that is why my answers were yielding inconsistent ...
2
votes
2answers
165 views

What is the meaning of these two inverted triangle water table symbols in a borehole record?

Consider the borehole record below (in particular the Water Depth column). There is a white inverted triangle at a depth of 3.20 m. What is the meaning of this symbol? The white inverted triangle ...
0
votes
1answer
61 views

what is issue with my room brick wall? How can i solve it?

I have seen a sort disformation on wall of my room I have attached snapshot of both inside view(from inside room) and out side view(that is out of room) inside view is below out side view is below
0
votes
0answers
33 views

Provide stability for a 3D object with a support structure

This is a follow-up to this question. I wonder if structural engineering tools like Finite Element etc. might help create such support structures. If so, how?
0
votes
0answers
42 views

ABAQUS UMAT SDVINI problem

I'm trying to write a UMAT code for unsaturated soil model and I need to define some state parameters. I found that I can do that by using SDVINI subordinate. Should I put it at the and of UMAT? How ...
2
votes
0answers
28 views

water leak through subterranean cable penetrations in concrete

See the image below for the detail of 4 no. cable ducts that run from a trench in a raft foundation (on the left) through an approximately 1 m square penetration in the raft foundation, through soil (...
1
vote
1answer
24 views

How is response spectrum result used for earthquake analysis

For simpler buildings we can use response spectrum analysis. How is this used? The maximum acceleration we get from this , is simply multiplied by the mass of the building to get F=ma , total ...
2
votes
2answers
29 views

Permanent uneven deformation of asphalt car park under portable cabins

Cabins have just been installed on an asphalt car park. The portable cabins weigh 4000 kg with 4 no. 300 mm square spreaders under each foot. The car park is constructed from: 1" thick rolled asphalt ...
-1
votes
1answer
43 views

What arrangement of web members is better? [duplicate]

I have a problem regarding following two structures. First one: Second one: What arrangemet is better ? Why ? Actually I have no idea which one is better.
3
votes
1answer
56 views

Why is there a row of circular holes in this concrete beam?

The reinforced concrete beam (approximate dimensions 36" x 18") shown in the image below has a row of circular holes at 3/5ths of the height of the cross-section at approximately 300 mm centres. My ...
1
vote
1answer
52 views

Analysis Of Statically Indeterminate Structures By Hand

When double-checking/confirming results produced by structural analysis software, many engineers recommend verifying and spot-checking key or critical members if the entire structure is not analysed. ...
1
vote
1answer
64 views

Which method is better to solve indeterminate trusses, force or displacement method?

For statically indeterminate trusses, which method is better? Force or displacement method? And why? I read somewhere that displacement method is not suitable for trusses but I must verify.

1
2 3 4 5
12