Terje Haukaas @TerjeHaukaas
UBC Professor, Berkeley PhD, Norwegian Carpenter, Worldwide Motorcyclist terje.civil.ubc.ca Vancouver, Canada Joined July 2011-
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Yesterday was the final exam in CIVL 435 Advanced Structural Analysis. Great students this year. They know how to find forces in shear walls in any arrangement with any cross-section, using matrix structural analysis, including torsion, bending, P-delta, shear deformation, etc.
Talking about stroke of genius (yesterday’s tweet) I wonder if you have seen the TED classic Stroke of Insight: youtu.be/UyyjU8fzEYU. Amazing what our mind sees if we quiet down the left side of our brain. The right-hand side reveals new aspects of ourselves and the world!
I started in Pascal but have programmed most in C++ and Matlab. Now sold on Python! Stroke of genius: Prof. M. Scott and Dr. M. Zhu at Oregon State created openseespy, a Python interface for OpenSees. Beats Tcl! openseespymac is the Mac version, maintained by S. Gavrilovic at UBC
A beam can carry torque in two complementary ways: St. Venant torsion=shear stress; Warping torsion=axial stress. Did you know that warping torsion also generates shear stress? It’s just like bending of beams. Here is an example: civil-terje.sites.olt.ubc.ca/files/2020/03/…
Did you know that you can apply the finite element method to cross-sections? These triangular "T3" finite element meshes show the warping for various cross-sections: civil-terje.sites.olt.ubc.ca/files/2020/02/… … using this Python code: terje.civil.ubc.ca/solid-cross-se…
I have always been a huge fan of Bill Maher. He is an animal rights activist, as is Yuval Harari in his book Homo Deus. Are humans treating animals right? Are we offended by Bill Maher’s New Rule: youtu.be/dEfDwc2G2_8?
Tallest building: Burj Khalifa in Dubai (828 metres). Tallest wood building: Mjøsa Tower in Norway (85.4 metres). Tallest & heaviest structure moved by mankind: Troll A condeep platform (472 metres). Built in a Norwegian fjord and moved to the Troll gas field in the North Sea.
Learning from disaster: Near midnight on June 16, 2015 a residential balcony collapsed in Berkeley, California. Long-term decay of wood beams caused by improper enveloping may have contributed to the accident. Unless you are building with Western Red Cedar, keep wood dry!
Claude-Louis Navier (1785-1836) and Maurice Lévy (1838-1910) created analytical solutions for plate bending. Navier’s solution: civil-terje.sites.olt.ubc.ca/files/2019/06/…. Lévy’s solution: civil-terje.sites.olt.ubc.ca/files/2019/06/…. Notice the values of the corner uplift we attribute to Gustav Kirchhoff (1824-1887).
The offshore rig Alexander Kielland capsized in 1980 at the Ekofisk field in the North Sea outside Norway, killing 123 people. A report concluded that the failure was caused by fatigue cracking in an important bracing of the massive 3D steel truss that supported the platform.
What is the optimal shape of a gas tank? Answer is found by boiling sausages and observing how the skin breaks in a longitudinal rupture along sausage axis. Equilibrium shows that the stress in that cut is twice that of the perpendicular direction. So optimal shape is a sphere!
Another bridge collapsing in wind: The 1879 failure of the Tay Bridge in Scotland is infamous. All aboard a passing train were killed. The engineer had made no explicit consideration of wind loads. Today all big projects must be in wind tunnel. Even now, wind can be tricky.
In 1940 the Tacoma Narrows bridge collapsed, months after opening. Regular wind speeds caused oscillation at a resonance frequency. Aerodynamic forces were not well understood. Are they now? For this bridge, at regular wind speeds, vortex shedding and torsional flutter coincided!
SHEAR stresses develop if you twist a beam. AXIAL stresses also develop if you prevent WARPING of the cross-section; then torque is carried in part by “warping torsion.” V.Z. Vlasov combined bending and torsion for thin-walled cross-sections. My notes: civil-terje.sites.olt.ubc.ca/files/2019/06/…
Aged 48, a dignified da Vinci returned from Milan to Florence in 1500. Asked to resolve a quarrel he said “You better ask Michelangelo” who at 25 was grumpy & unkept and shouted “Explain it yourself!” bursting into a tirade, berating Leonardo for not completing the Sforza statue.
One of I.K. Brunel’s most famous structures is the Maidenhead Railway Bridge. The extreme-low-rise arches caused a big stir. Critics said the bridge would collapse if the falsework was ever removed. The falsework blew away in a windstorm in 1839. The bridge still stands today.
The giraffe has the largest heart of any land animal. One of my heroes, American psychologist Marshall Rosenberg, knew this and created talks between a giraffe and a jackal. The giraffe says “Do you feel … because you have a need for …?” If you use those words you create peace.
To all CIVL 518 students I call attention to this nice application of the theorem of total probability. Notice the conditioning on a joint set of random variables; hence, a joint PDF appears in the right-hand-side. Good work.
To all CIVL 518 students I call attention to this nice application of the theorem of total probability. Notice the conditioning on a joint set of random variables; hence, a joint PDF appears in the right-hand-side. Good work.
After Galileo’s cantilevered beam, perhaps the most over-analyzed beam is “simply supported.” There are all kinds of things that are instructively explained with that example: Shear deformation, P-delta, energy methods, etc. Here it is, in all its glory: civil-terje.sites.olt.ubc.ca/files/2019/09/…
Babylonians noticed 7 planets so we have 7 days in a week: Sun = Sunday, Moon = Monday, etc. More consistent in Latin languages than English, so today (Thursday) we mark that I have my own weekday. Terje = Torgeir = Tor’s Geir = Thor's Spear. So Thursday = Thor’s-day = My-day!
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#Canucks showing off a new power play unit featuring Daniel Sedin, Henrik Sedin, Rick Tocchet and Sergei Gonchar. A lot of star power on this unit, could be something here.
The #Canucks practice PP unit of Rick Tocchet, Henrik Sedin, Daniel Sedin, Sergei Gonchar & Mark Friedman scores on the PK unit
"Our defence held the fort for us, experience-wise. When things got crazy out there, I thought they held it together…The experience helped us that round.” 🗣 Head Coach Rick Tocchet speaks on the defencemen in Round One and preparing to take on the Oilers.
"Its two markets where the hockey is so important to each city and so important to the people...As far as players, we've got to worry about what we can control and doing what we need to do." 🗣 Hear from Quinn Hughes on facing the Edmonton Oilers in the next round.
"We just got to play our game...When we play Canucks hockey, we’re in your face, playing in their end more than in our own." 🗣 J.T. Miller speaks on the team's mindset going into Round Two against the Edmonton Oilers.
REMINDER: April is Procrastination Awareness Month!
Vancouver is through to round two. Give Tocchet the Jack Adams.
Rick Tocchet's reaction to finding out that was Arturs Silovs' dress shirt is hilarious😂 #Canucks
#Canucks defensive core inspired by Tyler Myers efforts begin to prep for Edmonton series.
Arturs Silovs = Conn Smythe 2024
Canucks fans chanting “SILOVS!” for their new starter outside Rogers Arena after winning Round 1 👀 (via @canucksaz)
this kid not only stole someone’s job, he also won his team a playoffs series in the NHL playoffs. #Canucks
Enjoy this one, #Canucks fans.
How I’m walking into the weekend:
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