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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2
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1answer
32 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 ...
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1answer
35 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. ...
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1answer
22 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.
2
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1answer
53 views

Why is there this perforated pipe inside this vertical construction joint in a reinforced concrete wall?

The picture below shows a veritcal construction joint of an approximately 50 years old reinforced concrete industrial structure. The expansion joint was likely originally sealed with a flexcell which ...
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0answers
8 views

How does slope deflection and energy method relate to matrix methods in indeterminate structural analysis

I want to understand the relationship of slope deflection and energy methods to matrix solutions in indeterminate structural analysis. We can apply force (flexibility) or deflection(stiffness) ...
3
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3answers
44 views

How common is it to use more than two Rebar rows in a beam (bottom or top rebar)?

I'm programming a drawing plugin for autocad to draw cross-section in beams and ribs. I need to know if it is worth it to add (to my plugin) the feature to add more than two rebar rows, or if I'll be ...
2
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1answer
34 views

Can aggregate gain almost 200 grams of water when submerged in water for a day?

I'm doing this special project where I have to make concrete using a Martian simulant provided from a commercial source. I measured it as 500 grams initially, then submerged it in water for a day. It ...
2
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1answer
35 views

Is this corner window correctly structured?

Is this L-type corner window correctly structured? We used 18 rebars in total, 6 for each window. This building will soon have an RCC lintel.
1
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1answer
25 views

column yielding under earthquake

In the buildings designed with strong column weak beam concept, the columns will remain elastic, their plastic deformation will be limited. but this is not true at the base of the building. i mean i ...
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2answers
48 views

Any effect of fire in structural design of buildings?

Do we consider possible effects of fire, when we do structural design for reinforced concrete buildings? But for steel buildings we do? Also for reinforced concrete buildings, the thermal expansion ...
1
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3answers
28 views

column bending stress under vertical earthquake load

In Fema national US&R response system - Structrual collapse technicican training manual It says: "There are also vertical loads generated in a structure by earthquake shaking, but as mentioned ...
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0answers
13 views

Resultant , magnitude, and direction of LDL and Parabolic

- material mechanics and a basic background of mechanics or fundamental engineering knowledge for a first year course in university - Good knowledge of calculus - solving UDL & LDL type ...
15
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2answers
384 views

What is this large steel structure used in excavation?

I keep seeing these large rectangular structures on job sites they put in the ground. I'm guessing something for strengthening the surface structures?
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0answers
45 views

Why do we use the strain-controlled test for the compressive strength of concrete?

As you all now, a typical stress-strain curve for concrete under compression can be seen in any reinforced concrete design textbook. The decreasing part of the curve (post-peak) can be obtained by ...
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2answers
495 views

Vocabulary: NYC Elevated Highway & Trains, Industrial Park

I'm writing a story set in NYC and trying to describe certain industrial objects. I'm having trouble with specific technical terms for the items that I've marked w/ arrows. E.g. I don't want to use ...
2
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1answer
92 views

How is a highway prevented from being buried by sand in the desert?

When I happened to see pictures of a highway in the desert, the question arose in my mind. The highway will probably be buried if a sandstorm rages. So is there any solution to this problem? https://...
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1answer
34 views

How do you calculate heat transfer due to solar radiation for a multi-layer wall given the incident solar radiation and wall specs?

Trying to come up with a MATLAB code for calculation of heat transfer due to incident radiation on a building's walls, would the solution involve using the conduction equation only? What would be the ...
-1
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1answer
44 views

Why does a Gulf Coast campus need an active steam network?

The other day, some restauraunts in the union were closed "due to steam outage." I had seen the venting of course, but had thought little about why the school has a steam system. As best I can find, ...
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0answers
12 views

Cell phone booster for multiple buildings

Our company has a small remote site which includes three buildings, each less than 5k sqft, in a line. All three have poor to non-existent cellphone reception within the buildings themselves and only ...
-1
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1answer
38 views

How does Gypsum Concrete work?

When mixed with water how does gypsum act as a binder in creating concrete?
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0answers
11 views

Assigning different thicknesses to single part - ABAQUS

I am trying to validate the results of linear analysis from RSTAB (structural analysis tool) with ABAQUS. The model comprises of approximately 800 members. Each member is composed of built-up sections ...
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2answers
33 views

Where can I find a list of building codes to put on a set of blueprints for a addition

Most architectural companies have a template of blueprints they reuse for every project. As an owner-builder, I need to make these blueprints from scratch On page 1, I have to list all applicable ...
0
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1answer
63 views

Determining steady flow between two reservoirs with two different pipes in between

Two reservoirs are connected by two pipes with different diameters in series. The elevation of Reservoir A is 40m and Reservoir B is 35m to respective water surfaces. The first pipe is 500 m long with ...
0
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1answer
48 views

Maximum I-beam girder S12x31.8 span

Does 200lb/in of load on a S12x31.8 over 15 feet seem reasonable? I'm having a tough time trusting the numbers. Two story house with an attic as below. Dotted lines show load bearing walls W1 and W2. ...
1
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1answer
32 views

What will be the the width of the column strip in the case of 2 different spans in the same direction?

Say we have a plan of a building as follows and it is required to be designed using DDM (Direct Design Method). since the moment needs to distributed laterally into a column and middle strips and ...
2
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3answers
126 views

Why is building houses over train tracks way more difficult / expensive?

The question is already in the title, but I guess some context might be interesting: I'm living in Munich (Germany). It is the area in Germany which is probably most expensive to live. Even the ...
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0answers
11 views

Why does my, with RFEM simulated crosssection (class 3) fails at M_pl and not at M_el

I have designed a steel-plate with the c/t-Ratio of 124. The plate is a replacement system for a web. So the plate is 8,1 mm thick and 1000 mm wide. This implies, that the W_el=1343,33 cm³. The yield ...
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0answers
32 views

What is the kinetic energy required to impact the surface of asphalt roads?

I am trying to find estimates of the minimum kinetic energy required to impact the surface of asphalt roads as a first-order impact assessment of road functionality to rockfall (i.e. boulders hitting ...
0
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1answer
44 views

Designing PVC structure

I am an electrical engineering student that wishes I could have taken some civil engineering courses. Anyways I'm trying to design a pvc structure that I will use as a somewhat complicated room ...
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1answer
78 views

How to write a Cost engineering support plan?

How would I write a Cost Engineering support plan which reflects the Project Control Cycle? A wine company is wondering if they should invest in another factory. Only this time it will be in the USA. ...
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3answers
53 views

Deflected Beam Shape as a Function of z

I'm a bit confused with the wording of the question. What does it mean by expressing the bending moment and the deflected shape of BC as a function of z? Thank you]1
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0answers
47 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 ...
2
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2answers
74 views

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 ...
2
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1answer
112 views

Does the volume change under the tensile or compressive stress?

This confusion arise because my teacher says that volume does not change under tensile/compressive stress within the elastic limit of the material ( consider metal here). But as far as I can see via ...
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2answers
138 views

Not solvable question civil engineering

They didn’t give me the radius of the wheel where external force F is acting . How can I calculate the reactions at A,B . When they didn’t give me the radius . Is this question “ Wrong “ ? Note ...
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1answer
25 views

Getting the elevation of a specific point of a elevation gridline

In a highway Project, I have to design a road connecting to roads together. The map I have on AutoCAD is a elevation gridlines map and I have x, y and z coordinates but I don't know how to get an ...
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1answer
72 views

Help! How to cement plaster outer wall. If gap between the two walls are 1 feet only?

[House Plan Image] My neighbor is not allowing us to wall plaster of the side outer wall.(Facing Neighbor side) How can I plaster the outer wall, which has a gap of 1 feet between our wall and ...
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0answers
29 views

Blower-door test: should we calculate its output during sizing of the heat exchange ventilation?

A human needs ~30m3/h fresh air. Our 100m2 house is occupied by 4 humans, so 4 * 30 = 120 m3 fresh air needed. A blower-door test says at 50 Pa, max 60% of the air in the house can be exchanged (...
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0answers
30 views

Can Flowmaster be used to model an entire pipe run?

I just started using the Flowmaster program (ver 08.11.01.03 if relevant) to model a series of stormwater pipes which are almost certainly in a pressure flow situation based on a first round analysis ...
0
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2answers
26 views

How to keep a symmetric-lens-shaped object upright using only wire?

Given a lens-shaped frame with a single crossbar running parallel to the floor, how could we keep that object upright and stable on one of its endpoints using only wire? The shape I'm describing is ...
0
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3answers
73 views

Why are parts of a cylinder closer to centre elongated less during torsion?

Say we have a fixed cylinder with a radius of $R$. Looking at any cross-section, the shear stress at a radius ($r$) is given by $\tau = G \gamma $. I understand that the particles at the outer radius ...
0
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2answers
91 views

2D- Truss Member Analysis

I am a graduate student trying to sharpen the direct stiffness method skills. However, I am stuck at the beginning. The problem is given in the image. Can someone help me to write down all the nodal ...
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2answers
58 views

what means Probablity of event excedence of so many years

I like to know about occurrence of earthquake events when we say that earthquake of 0.5 g will occur in 50 years in excedence of.
0
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3answers
49 views

Maximum spans in multi-level building

Is it possible to build a building with 3 levels, with the 2nd and 3rd levels having areas with clear spans (no columns) of 130 ft length and 85 feet width? There can be columns outside of this clear ...
2
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2answers
50 views

Determining Support Reactions

I have a statics problem that I am running into some difficulties with. What is being asked here is to determine the support reaction at the points A and C. This would normally be no problem, but when ...
2
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2answers
129 views

Concrete Slab Deformation

The concrete slab (?) supporting the swimming pool (≈ 10 x 10m x 1m) of my building has clearly a 'belly': I'm not sure whether this was built this way or evolved over time, however, my best guess is ...
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0answers
62 views

Dyke improvement

I'm a civil engineering student, and it's my first year at the University of Applied Sciences, and I'm doing an exercise but can't figure out one of its parts. The question: what are the advantages ...
0
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1answer
42 views

How is the Outlet flow rate in a water system controlled?

The Hardy Cross method for analysis of fluid systems assumes that in inlet flows and outlet flows for the system are known. However, when one constructs such a system in real life, how do we ensure ...
0
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1answer
93 views

Deflections Of Statically Indeterminate Structures

When analysing and then designing a rigid jointed, statically indeterminate structure, I can solve for all the forces and moments using the Hardy Cross (Moment Distribution) Method. However, I am ...
0
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1answer
46 views

Assessment of steel beam for lifting to Eurocode 3

A client wishes to use an existing steel beam to lift a 1 tonne load using a sling. The 3 m long beam is measured as UB 203x133 visually observed at both ends to be secure with end-plates with all ...

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