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Civil Intro Part1 — Transcript

by hsc ng · 2,726 words · 389 segments · language en · Watch on YouTube

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0:00in this video I'm going to go through an
0:01overview of what we're going to cover in
0:03the HSC course the engineering course
0:06for the first topic which is civil
0:08structures okay so you mean spending a
0:10term we actually will probably spend
0:12more time on civil structures than we do
0:14on the last two so the first two first
0:17two chapters take up a lot more time
0:19than the third and fourth chapter so
0:21we're going to go through that so always
0:23that we follow the same pattern which
0:25was we have historical and social
0:26influences and then we will go through
0:28mechanics will go through materials and
0:33communication so communication is going
0:35to be graphics and we have to do a
0:37report so the report has to be done
0:39civil or personal public we're going to
0:41do our report in civil so that is a
0:45pretty priest and the key things we're
0:47going to point out here okay so when we
0:49do mechanics the big thing that we're
0:50gonna learn this time around is trusses
0:52and bending now I think bending is
0:54incredibly important unfortunately tends
0:56to be under tested in my opinion in HSC
0:58we learn about stress and strain but I
1:00don't think there's anything we learnt
1:02that you have not already learned in
1:03year 11 okay for testing materials again
1:06I try to teach the testing material
1:08stuff as much as I can early now crack
1:10theory if you look see there's quite a
1:12bit of stuff here on cracks now me look
1:15I I have I cracks really trigger me I am
1:19I have a lot of cracks in my apartment
1:21and also there's like five pages in the
1:23textbook on cracks whereas me I think
1:25you could sum up cracks in one line
1:27which is if you have a crack and you
1:29want to stop the crack from growing
1:30drill a hole at the end that is it right
1:33literally I've told you everything that
1:34you need to know about cracks but we
1:36will go through the book ceramics so
1:38that's obviously going to be cement and
1:39concrete it's also going to be bricks
1:41glass we've already learned about glass
1:42pretty much all I have to teach you
1:44about glass we've already done we're
1:47going to learn about composites again
1:48covered pretty much everything here we
1:50haven't talked about geotextiles very
1:52much yet concrete is considered
1:54composites we all saw them at ceramics
1:57corrosion is we're gonna corrosion big
1:59topic so corrosion is something we will
2:02probably spend several lessons on okay
2:04then we going to talk about
2:05recyclability materials again not a huge
2:08amount that I have to say about this
2:10there is more and more we are working on
2:12try
2:13to reduce the we always try to reduce
2:15the amount materials we use there is an
2:17option for like reverse garbage where
2:19people can if you dispose of things well
2:21that we can use to reuse these materials
2:23crushed concrete can be used as Road
2:25base and things like that
2:27but ultimately it's not something we
2:29focus heaps on so just putting it heads
2:32up when we get to straighten standards
2:34the big thing that you're gonna be
2:35assessed on in terms of your assignment
2:39is gonna be dimensions now I didn't
2:40focus on that life's much last year this
2:42year I'm gonna focus more on dimensions
2:44okay we're also going to do a little bit
2:47of sketching again we haven't done much
2:49sketching in last year because there's
2:51just not a whole lot of marks in the HSC
2:53I'm gonna probably give you more
2:54homework to do this year on sketching
2:56and we'll have to do CAD as part of this
3:00assignment so that's going to be a
3:02couple of changes okay so that's the
3:04that's what we're covering that's what
3:05we have to do in the next ten weeks or
3:07so and what are we gonna have a look at
3:11as well okay in terms of the description
3:16of engine or what does civil engineers
3:18do well we've got different kinds of
3:19civil engineers structural Transport
3:21hydrology geotech so civil engineer is
3:25responsible for the design and
3:26management structures and infrastructure
3:28projects this includes things like water
3:30supply so pipes transport networks so it
3:33also includes structural engineering
3:35which includes things like buildings it
3:38can include things like towers airports
3:40a whole bunch of different fields okay
3:43when we look at civil engineers their
3:46roles and responsibilities civil
3:47engineers need to design solutions for
3:49infrastructure needs right so everyone
3:52has to design solutions all engineers
3:53find solutions they find infrastructure
3:56needs solutions right everyone has to
3:59worry about social and cultural impacts
4:00health and safety everyone has a role
4:02Engineers have to do some calculations
4:04they calculate forces they apply a
4:06knowledge of materials to design
4:08structures adequate to withstand those
4:11forces so we so the big thing I'm going
4:13to sort of step back for a second and
4:15say so what are civil engineers do well
4:17they have to figure out or guess what is
4:21a reasonable amount of load the
4:22destructure needs to take and once
4:25they've figured out what it needs
4:27they design something that's going to be
4:28suitable now it is impossible to make
4:31something that will never break right
4:33because if the mother of all earthquakes
4:35hits your bridge right you're not going
4:38to be able to design for that and it
4:39wouldn't be cost-effective right
4:41something I say many times is anyone can
4:43build a bridge it takes an engineer to
4:45build the cheapest bridge that is just
4:47good enough to reliably not fall down
4:49right so to withstand the forces that we
4:53have calculated all the counter forces
4:55that are specified by our strength by
4:57these these standards in our case this
4:59trend standards okay we consider
5:01economic impacts now look this is one of
5:04the things we often undersell but in
5:05actual practice if you can't make money
5:07right you can't pay the bills you're no
5:09longer an engineer right if you can't
5:11pay pay for your wages you have to do
5:13another line of work
5:14very few put in Janine's can afford to
5:16do it for free okay now you have to plan
5:19and supervise construction or you have
5:22to supervise the design but there are
5:24civil engineers who supervise
5:25construction right probably the majority
5:27of Engineers who work as civil engineers
5:30they're probably more focused there are
5:33more who hadn't focused on the
5:34construction side then there are who
5:36have focused on the design side and I
5:38think that a lot of people are surprised
5:40at that
5:40a lot of people you know especially a
5:42very book smart nerds
5:44say hey I wouldn't go be an engineer
5:46because I like maths and then they find
5:48out that two thirds of Engineers work on
5:49in construction and it's a very
5:52different world so when you're designer
5:54you wear a tie and you're going to work
5:56in a nice air-conditioned office and you
5:59whereas when you're a site engineer
6:01you're wearing you know the denim the
6:06denim work hy-vee's and hardhat and it's
6:09how many times you have to swear at
6:11someone to get someone to get a job done
6:14they're also engineers civil engineers
6:17are in charge of maintenance and
6:18operations so a lot of civil engineers
6:20work for councils and their job is just
6:23going and maintaining the roads filling
6:24in the potholes doing the little bits
6:26and pieces here and there to make things
6:27better ok so that's what civil engineers
6:30do we can close that I was gonna focus
6:36too much on these syllabus outcomes okay
6:39what I'm going to look at now is what
6:40the book
6:40to say about what civil engineers do so
6:45for this chapter the chapter book is
6:47divided in the same way so we've got
6:49historical and civil developments in
6:51civil structures it talks about how
6:53they're focusing on bridges rather than
6:54dams or pipelines or something like that
6:56we've already covered that in other
6:58videos but I will pause this to show a
7:02nother just quick summary of bridges
7:05that will kind of give you the main
7:08points of a little bit now I did show
7:13this briefly when we talking about
7:16talking about bridges in the history
7:19lesson but this would be a very thick
7:21very quick and effective summary so this
7:24is an Airbus a380 most of you guys have
7:26seen one of those this is the Titanic it
7:28was a big ship so this is giving you a
7:30perspective of 100 meters so we have old
7:34bridges like Trajan's bridge we have the
7:37rialto which was the first the revision
7:39of bridges when we had the Renaissance
7:43this is London's Tower Bridge and then
7:46we have all the fourth bridge which is
7:49quite like you can see roughly how
7:50that's a very very long bridge here we
7:52have the heart Sydney Harbour Bridge we
7:54have the more recent I'm not going to
7:57ciao TN men don't try and do the tones
8:00then we have the Golden Gate Bridge
8:04which was the longest bridge for a very
8:05long time and now we have the Akashic
8:07kyoko bridge akashik echo okay again
8:12don't care enough to try and pronounce
8:14it properly bridge which is huge by
8:16comparison and then we have the Millau
8:20Viaduct which is in France showing that
8:23that is just remembering that that is as
8:25tall as the Eiffel Tower at that tower
8:26there okay so that's a rough summary of
8:29bridges and that's enough bridges that
8:31you could talk about the significance of
8:32this you could pick two of those and
8:34compare them and say how is this these
8:36innovations come about well improvements
8:39in design improvements in materials yeah
8:42so an improvement of design means that
8:44we can design more effectively more
8:45efficiently improvements in materials
8:47allow us to build more bridges more
8:49economically okay so I can close that
8:55now what I'm going to go into okay so
8:59environmental implications and materials
9:01okay so we'll go through that okay so
9:05the next big thing the big focus on this
9:07topic is trusses so trusses we're going
9:10to talk about reactions we're going to
9:12talk about some different kinds of
9:14reactions calculating reactions using
9:15moments we're then going to learn how to
9:17calculate trusses and because that goes
9:24on for quite a while like I said it's an
9:25important part we're then going to learn
9:26about bending and kept bending
9:29calculations which in my opinion are the
9:31most important thing in a civil engineer
9:33to know even if it's not tested very
9:36much okay moving on from there I will so
9:43two resources that I'm going to talk
9:45about both the Nutri videos to help you
9:48get started on trusses so there's a guy
9:50called HSC engineering and in his videos
9:53he he has one video that explains the
9:57method of joints which I actually like
10:01especially if you have to solve a whole
10:03trust but these days I don't really
10:05teach it very much but because it's in
10:07the syllabus I am required to teach it
10:08for a second or two but then most people
10:11and most engineering teachers will then
10:13focus on the method of sections there's
10:16two ways of solving trusses most people
10:18will focus on that there's also a lesson
10:20on bending to two episodes on two videos
10:25on bending as well I also have a in my
10:28collection I have bending somewhere here
10:32bending there and a trust question there
10:34so we'll focus back and I will probably
10:37add some more as I go on but for the
10:39moment that's what happened right now
10:41okay so going back to the book so
10:48calculating the bending stress and a
10:51little bit of a description of when we
10:53deform and distribute loads she so we
10:56have talked about shear but we've never
10:58talked about more complicated examples
10:59which for instance of punching a hole or
11:01if we're dealing with bolts they're the
11:04two main cases that are more complicated
11:06that we work about here then
11:08the Eagles flea stuff which you already
11:09know okay so moving on there's testing
11:13now I've already talked a lot about
11:14testing I think I have a video certainly
11:17have a pretty comprehensive description
11:19on Facebook then there's look at let's
11:23say many pages on cracks right so
11:26where's a cracking start so one page two
11:29pages three pages three and a half pages
11:33right what's my summary with three pages
11:35been my summary drill a hole at the head
11:39of the crack that is that is my summary
11:41of those three pages okay Ceramics so
11:43we're talking about glass right we
11:45talked about bricks we talked about
11:48pre-stressed and pro stress concrete
11:50which we talked a little bit about
11:51already but not much asphalt which is
11:54what we make our roads tarmac is for tar
11:56macadam because the NGO called macadam
11:58was about who came up with artificial
12:01tar tar is the thing that's existed
12:03since a long time like there's the tar
12:05pits in California but asphalt is
12:10asphaltic cement is where we take
12:13man-made a man-made product we take
12:16bitumen and we add Rock Orso aggregates
12:19to get asphaltic cement or asphalt ok
12:24laminates where we talk about different
12:26ways that we can make long sections of
12:28wood we didn't spend a fair bit of time
12:31talking about corrosion and then
12:34communication so here we're really going
12:35to focus on threaded sections of bolts
12:39now threaded sections are incredibly
12:40important that is something there's all
12:42my trusses and threaded sections are
12:44almost certainly going to be an exam and
12:46I have not only do I have examples where
12:49I've gone through questions from past
12:51papers but here I have a video that I've
12:53recorded where I go into great detail of
12:56all the stuff that you need to know
12:57about bolts so that you are you can go
13:00through that this is another example
13:02where I've talked about threaded
13:04sections they're now not saying it like
13:06I always say nothing everything my thing
13:08is perfect but it's a starting point ok
13:11so in the time I've got left for this
13:12video I'm going to talk about the
13:14assignment so we've talked about the
13:15summon briefly these are the different
13:17outcomes that requires us to do and
13:19we're going to design a truss
13:22considering structural and economic
13:23factors we're going to do drawings to a
13:25s eleven hundred we're going to plan our
13:27time and manage our time record our
13:30management of our time and then we're
13:32going to analyze our results okay so
13:34we've talked about this but it needs to
13:37be uploaded to Moodle it needs to be all
13:40your own work doctor certificate just a
13:43that there are doctors who will come to
13:44you and it's hard to know if you don't
13:45have gastro if you're going to be sick
13:49design requirements okay that might
13:51change because we're going to be making
13:53our once-ler differently report
13:55requirements it's going to have three
13:56main sections you can have a design
13:58section and management section and
13:59analysis section design you're going to
14:01come up with three different designs
14:03you're gonna pick one of them then
14:05management you're gonna say what your
14:07group did and you're going to talk about
14:08how well they did it right so you're
14:10gonna say what in advance what you're
14:11going to do and then I'm gonna say what
14:13you did do that's really important in
14:15engineering management okay you're going
14:18to document your process you're going to
14:20calculate all the forces in your truss
14:21you're going to calculate the critical
14:23member and you're gonna write about your
14:26load to weight ratio which is how we're
14:27going to assess it we're going to
14:31include your predictions about what how
14:33it went whether or not went how you
14:34expected and how it could be improved
14:37I'll quickly show you now a sample of a
14:40students one in twenty seconds so this
14:45is reports got a title page got an
14:47abstract table of contents could have
14:49been a little bit nicer but here's these
14:50suggested solutions he's got three
14:52designs and suggestions here's his
14:55sketches with dimensions the dimensions
14:57are not too Australian standard and
14:59that's really important

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