Why Performance Based Design Achieves Structural Efficiency

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performance-based design of structures overcomes some of the shortcomings of following the prescriptive approach when undertaking the traditional codified design. The performance-based design allows you to find the optimal solution that meets serviceability, structural capacity and robustness while still ensuring your design is efficient and sustainable. Performance-based design of tall buildings is often something that is overlooked in structural design, because of Performance-based seismic design, however, you can achieve efficient design
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My name is Brendan, and I am a structural engineer with over 15 years of experience in Australia. I have a wide variety of projects, from very small to some of the biggest in the southern hemisphere. I have a passion for good structural design and teaching/mentoring.
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Chapter
00:00 Intro

Опубликовано:

9 дек 2021

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Комментарии : 66

@andreasgustafson2402 4 дня назад

I am a structural engineer here in Australia, have 20 years of experience. I have been using advanced non linear analysis for over 15 years, for seismic actions and wind loading. I’ve been developing new methods of engineering precast concrete structures using vertical post tensioning. We have undertaken physical full scale testing at Swinburne university on this new innovative system. I’ve used non linear pushover analysis for structures here for 12 years on very tall towers to sway frame retail structures. It is very true that PBD produces structural optimisation, even under wind loads. As a professional engineer the attacks I have been subject to during peer reviews by the biggest consultants in this country has been extraordinary, and depressing. The more advanced you are as an engineer, the more the code compliance specialists undermine the profession and innovation. I am quite impressed and happy you have produced this video. Reach out if you want to discuss.

@TonioCartonio619 2 года назад

Last year in university I took a course about seismic design, where the professor taught PBD and seismic isolation (applied on RC structures). My first reaction was something like "wow, the idea is amazing", and as the course progressed I felt like i was understanding in a better way how the building works. Just wanted to share this, have a nice day Brendan

@BrendanHasty 2 года назад

Hi Tonio, thanks for sharing. Agree more detailed assessments allow you to understand building behaviour better, as the more simplified approach has had assumptions to simplify the assessment.

@BoZhaoengineering 2 года назад

Solid on this topic! Thank you for the video, Mr. Brendan. I almost use Response spectrum analysis, RSA, for all scenarios. And it is the method, recommended by Euro Code 8 for every type of structure. Some literature tells us how it works. But the left is how to combine the action for the structures as 'equivalent loads' for the accidental category in load and resistance factor design. The FEM software I use offers the combination method for each significant direction affecting the structures.

@BrendanHasty 2 года назад

Hi Bo Zhao, agree most of the time I also use RSA. Have started to looking in to PBD to achieve a more efficient design specially when construction budgets are tight. But it does take more time so need higher fee.

@Mark-cy8ow 2 года назад

Hi Brendan good job with these video very informative WSP is lucky to have you on the team

@BrendanHasty 2 года назад

Hi Mark, Thanks for the support, and comments.

@PaulGrosvenor1 2 года назад

Really interesting subject! Thanks.

@BrendanHasty 2 года назад

Hi Paul thanks for watching.

@user-nh7lo2np1j 6 месяцев назад

Very interest topics

@oslekcom1 2 года назад

I ran a 40 story building in LA and took me 3 days to run for only 7 sets of ground motions now you are required to use 11 sets of ground motion wow

@BrendanHasty 2 года назад

Hi Jose, I agree the more complex modelling can take a long time to run, and if there are errors in the modelling, the time is wasted.

@PeterRanieriII 2 года назад

Very interesting topic as always from you Brendan! I would just warn engineers trying to design buildings into the plastic deformation zone is not something the department of buildings here in NYC likes. Just make sure you always are checking your local codes for what would be acceptable because at the end of the day we have to comply with the code...even if it's behind the times! The last thing you want is an audit of your building and they make you completely redesign because you are too smart for the code enforcers

@BrendanHasty 2 года назад

Hi Peter Agree that sometimes you if can convince the certifier you need to still comply. You will want to make sure before doing too much work.

@IndianWarriors 2 года назад

Greetings from 🇮🇳 India

@BrendanHasty 2 года назад

Thanks for the support Satyam, comments help alot.

@Schmitty0202 2 года назад

Hey Brandon love the channel and by far one of your best videos. Design build and pba are big methods now! I study at cal poly Pomona for civil engineering and would love to chat!

@BrendanHasty 2 года назад

Hi Reuben, thanks for the support. Always trying to improve. Always up for a talk just need to find some free time.

@planetunie6397 2 года назад

Sir Outstanding job🙌🏼🙌🏼🙌🏼 You are a real genius! Why don’t you open a Virtual design training center/institute where we can register and practically learn from you, using a software you recommend. Project based course will do.

@BrendanHasty 2 года назад

Hi planet I hope to do this in the future. Just need more hours in the day. Thanks for the support and encouragement.

@WediIbrahim 2 года назад

Hei Brendan, I am a student in structual engineering. I am not understanding the concept when everything is included. I have many question: - Can you make a step by step videosfrom start to finish how multy storey building are built? Do you start first by structual analysing the whole building frame, then design it with the national or international codes? How are modern walls built, with steel and glass or aluminium or wood? Masonry structures from the 1900 hundred are symmetric and have good aesthetic form into it. What kind of materials did they use, brick or stonework unreinforced masonry, wont it collapse during earthquakes

@BrendanHasty 2 года назад

Hi Sami, hope you are well, thanks for the question. I will see which of these can be included in videos and which may need to be a Paid VOD. thanks for the support.

@fammazali 2 года назад

A very nice and comprehensive illustration of PBD. I had a query as Push Over Analysis covers the non-linearity for static cases. What about dynamic cases? Does it have a separate code?

@BrendanHasty 2 года назад

Hi Fammaz, you can make push over analysis more complex with a non-linear assessments. You can also assess the load distribution on your dynamic cases. The more complex you make it the longer it takes, also build up the complexity in several models to ensure the building is behaving correctly.

@fammazali 2 года назад

@@BrendanHasty which software will you recommend for such an analysis? Is ETABS fine?

@DeepakKrishna11 2 года назад

Solid info , performance based design is not given much attention in universities still. Keep going.

@BrendanHasty 2 года назад

Hi Deepak, agree but it will be something that will get more and more attention. Thanks for the support.

@scr5051 2 года назад

Greetings Froom colombia south América, presstresed and steel design. Please. Skyscrapers, fazlhur khan son. Great channel

@BrendanHasty 2 года назад

Hu SCR, I have a older video on precast design sorry for the quality of that one, also have the golden rules of steel design. Hip we these help. Will be covering these topics into the future.

@manasavuibaubatiwale3593 2 года назад

Awesome video mate 💯 Just two questions: 1. "How do you manage your time between RU-vid, Work and family?"... and 2. "Could you do a video series on designing a simple structure according to AS/NZS codes?" Cheers 😊

@BrendanHasty 2 года назад

Hi Manasa, time management youtube occures between 8pm and 12, work 8 to 530/6 family time weekends and the free time on weeknights.

@BrendanHasty 2 года назад

Thanks for the support, when I start making enough on the channel will likely hire an video editor but that will be a while.

@BrendanHasty 2 года назад

As for a video to AS codes I will be doing this as a paid VOD, as it will likely not get enough views on youtube

@manasavuibaubatiwale3593 2 года назад

@@BrendanHasty awesome - yeah, since it's a niche area that would be the way to go. I'd definitely pay for that :) Just waiting to graduate from doing B.E Civil in Fiji - just want to learn as much as I can in structures. Quite inspiring seeing content like this on RU-vid!

@lukew3940 2 года назад

Hi Brendan, appreciate your videos. Regarding structural design, have you ever had to deal with heritage listed components. If so what are the approaches you would use to incorporate heritage in your design. For example, using sandstone for bridge columns. Moreover, If possible could you make a video doing resume critiques and any advice on gaining a structural engineering internship.

@BrendanHasty 2 года назад

Hi Luke I have done several heritage listed building. Alot of the time you can design using modern codes, but sometimes the structure will need to be too big. I have also approached by having new structure eg still framing. And limit the fixing to the existing building thus having a separation between old and new if done effectively can also get approved.

@BrendanHasty 2 года назад

I have planning a video on interview tips, and videos on resumes would also ve great.

@lukew3940 2 года назад

@@BrendanHasty thanks a lot

@igorbt6706 2 года назад

Do you have any comment about the Millennium Tower in San Francisco that sustain significant tilting. Do you think that still could be saved o should be demolished before a suddenyi catastrophic event happen?

@BrendanHasty 2 года назад

Hi Igor, I haven't seen the design, but it would need to tilt significantly before it becomes a issue. So I would hope that the building could be rectified before it tilts to much. The tilt wouldn't be able corrected tho.

@igorbt6706 2 года назад

@@BrendanHasty This building, yes is still structurally sound. Are on the way efforts to correct the actual tilt that now are affecting all the sistems that work with gravity. Thank you for your always good information.

@yogkar4993 2 года назад

Any standard reference for pbd

@scootertheeb6172 2 года назад

Push-over method is not suitable for high rise buildings or irregular structure, what’s more, it’s only suitable for building which dynamic performance is governed by its 1st vibration mode.

@mairajhabib9754 2 года назад

Hi Scott, What limits Push Over to be applied on High rise or irregular buildings ?

@BrendanHasty 2 года назад

In Australia they have had a very prescriptive approach to design, Push over allow to remove some of these requirements. Agree that more complex analysis like non-linear time history achieve greater savings.

@BrendanHasty 2 года назад

High Rise buildings are typically governed by wind, so you would getting savings on wind tunnel testing.

@ladiidoodi7468 2 года назад

Hey may I ask if you can do a video on how to apply PBD using design softwares, much better of you do it in ETABS . Thank you!

@BrendanHasty 2 года назад

Hi Kenneth, I can do a video on this. Thanks for the suggestion.

@fillbertnjoko7875 2 года назад

Is pushover analysis often used after designing a structure?

@BrendanHasty 2 года назад

Hi Fillbert. At the moment it isn't that common but it is becoming more popular.

@Karim2clean 2 года назад

Hey brendan! I have a question/video suggestion. What type of entry level structural engineering interview/technical questions do firms ask when hiring new engineers?

@BrendanHasty 2 года назад

Hi Karim, thanks for the suggest it is on the list. Interview are more of a discussion, of course having a solid understanding of engineering is important, but it is more imporant to fit into the company culture.

@irfanyallallahsaveworld Год назад

Good

@BrendanHasty Год назад

Thanks for watching

@mrp973 2 года назад

Hej Brandon and thanks for the video! Is this the push over analysis that you analyze here?

@BrendanHasty 2 года назад

Hi Mr P is haven't shown a pushover assessment on my channel. I should make on one how to set it up in etabs.

@jayt2908 2 года назад

Sir, as structure engineering is broad. Is it okay if I only focus on either only steel structure design or only rc structures design or something like that and further dedicate career towards only one of that.

@zannettos 2 года назад

Short answer: No. You should be able to design basic structures with common materials (steel,concrete,timber,masonry).

@jayt2908 2 года назад

@@zannettos i want to ask this question with an experienced professional

@BrendanHasty 2 года назад

Hi Alex it really depends but I agree with Alex you want to learn all materials as you get a broader range of building you can design and also improved you understanding of structural behaviour. You can specialise but I would recommend broaden your knowledge.

@fajarali6481 2 года назад

What software i learn? I doing Bechlors civil engineering( general). So that i can get a job in Australia when come to Australia as fresh engineer.... Kindly what software do civil engineers use... Kindly make a video or reply in comments

@BrendanHasty 2 года назад

Hi Fajar, this will be slightly different for each company, but bu typically Rapt, RamConcept, etabs spacegass. But every company will use different ones, better to get design work to Australian standards even at small companies.

@36studio11 2 года назад

Dear Brendan. I am a PhD student and my topic is AI in structural engineering. One of my biggest goals is to predict structural response using machine/deep learning. By now, the main goal is to predict Non Linear Time History (NLTH) seismic response of the building. Can you please tell me, how useful can it be for the industry to have this kind of tool? Or maybe it’s better to predict response spectrum analysis outcomes (for elements presizing in the conceptual design stage)? I am asking this question under this video, because PBD is frequently used with NLTH analysis. So, I was thinking that maybe it could be very useful to predict structural state (IO, LS, NC) rather than inter storey drift (my initial goal). What are you thoughts on this? I am sorry for so many questions, but I recently find your channel, I really appreciate your efforts, and thought that you can give me some indications based on your experience. Thank you in advance!

@BrendanHasty 2 года назад

Hi 36 Studio, your research topic sounds amazing, NLTH would achieve the most efficient design, but how is the processing time? It would be ever useful if it doesn't take long to process. Response spectrum would allow for a quicker assessment so would be better for a quick preliminary sizing where you may have lots of iterations.

@36studio11 2 года назад

@@BrendanHasty Thank you for your response, Brendan! If by “processing time” you mean “how long should I wait for the result to appear?”, the answer is “more or less immediately”. Basically, you just insert materials, elements’ cross sections, basic geometry (height, elements’ lengths etc) and ground conditions, push the button and get the maximum inter storey drift of the structure. Of course, it will take us a while to train this neural network (since we don’t have much open source data for NLTH analysis, we need to generate it in Opensees or using API of SAP2000 or other FEM software. Basically we will need to run a loot of NLTH analyses to generate enough data), but once the neural network is trained (and able to predict the results with a high accuracy) it can give the output immediately. The main value of our research is the following: Since NLTH takes a lot of time to perform, we see a need for the quick response prediction of this analysis, so you can avoid a numerous iterations of it. We hope, that our neural network will be able to achieve it. Of course, with some limitations (that we will discover during our research). What do you think about this idea? And which parameter in your opinion will be the most useful to predict? Now, we think about the maximum inter storey drift among all floors. We probably cannot include multiple outputs since it will take much more data train neural network (I.e., more NLTH performed by us, which take much more time etc.) Thank you in advance for your answers. And I can update you about our research if you are interested through email/LinkedIn or as you prefer.

@michaelloreantz 2 месяца назад

@@36studio11"lots of NLTH analyses" does not sound easy, at all. The problem with PBD is the amount of data that should be considered. You are then supposed to train the model to predict responses of different ranges of structural systems, ground motion levels, material non-linearities, hinge modelling, hinge parameters, state of hinges and so on. Considering the amount of time to run a non-linear model, I believe it should be a mega work to do.