Worked for EQC (Earthquake Commission) in NZ after the Feb 2011 quake. I had a home owner comment after their double story house lost all the brick cladding off the exterior from the first quake and that once ply had been temporarily fixed to the house it didn't notably flex in the significant after shocks.
I saw some videos of the 2011 NZ quake. It was pretty frightening. I'm glad I wasn't there in that highway tunnel through the mountain or near some of those buildings or near the big bluff with the houses below or . . . Just going to stay here in California . . . although we are going through some nearby flooding . . .
Actually almost all of them are tests in Japan. Only last 2 tests are not Japan. 3:46 one could be not Japan. To watch those tests more, copy and paste this word 耐震実験 or 耐震テスト The word means Earthquake resistance test. I know the videos are Japanese one. Because I'm from Japan and was working as an carpenter before.
I did a job for a guy from Germany where the houses are all made of concrete block and he told me the houses in the U.S. were like the housing that was built cheap and fast right after World War 2. It is true, the houses here are not built to last with or without an earthquake.
He's not entirely correct--concrete blocks and morter are one of the most susceptible materials in an earthquake because they don't have any flex (so they just break when force is applied). Wood may be cheap but it can bend without breaking far better than stone. You do still need to attach said wood to the foundation properly (and the US definitely has a problem not doing that properly), but wood itself isn't an enemy in earthquake zone, bricks are.
Unless that concrete block house has a LOT of steel in it, it would be a death trap. Far worst than wood. Germany however is not in an earthquake zone, so no real problem.
I used to think the US were a bunch of cheap-ass nutjobs, but I see the appeal on cheap buildings now: they're easy to replace when the owner doesn't claim it anymore. of course you're not going to actively go about and put houses to the extreme test every single day... they're built cheap so they can be taken down after a number of years. you build them "to last", but what happens if a number of years from now a technology comes up that's several orders of magnitude better than what you have? how do you take down that building that's built "to last"? you'll be phased out by several years and orders of magnitude with relation to the rest of buildings, by the time your building is truly "phased out" by it's own integrity. I live in a brick house, and I had to improvise some sealing and weather proofing because the wind leaks through the smallest gap in the windows and doors..... nobody thought of that, at the time.
@@mrmr4622scarily, I live in California (The 2nd most prone place in the world to earthquakes) and it does not take a high magnitude to do that. Heck my tables topple over in my room at a magnitude 3.
You're looking for SIPS to achieve an earthquake rating. Stick built for the mass market has never survived a shaker table test. It has become code as best practices, but not truly certifiable.
@@lollipopyummy4924 no, spray foam can't be used without plywood. So your statement Clearly states this comment went 50 ft over your head. Considering plywood owned this test like a black belt va 5 year old.. yeah 50 ft might be too low.
The seismic waveform of the 1923 Kanto earthquake is most commonly used in Japan's seismic experiments. 100,000 people died. Magnitude was 7.9-8.2. It is estimated that it would have been a seismic intensity of 7 on the Japanese seismic intensity scale in the 21st century. The 2011 Great East Japan Earthquake had a seismic intensity of 7. Japan's seismic intensity scale is up to seismic intensity 7 and there is no more than that. Because it is meaningless.This is Tokyo.
@@bayarearetrofit5814 RC houses are concrete houses. Reinforced concrete house. It is a concrete house reinforced with reinforcing bars. In Japan, it is called RC housing, but isn't it called RC housing in the world?
@@RC-RCdesignstudio Are the wall-type RC hoses floating on the foundation? It seems to be a good idea to have a sturdy footing that is not attached to the foundation.
@@Drottninggatan2017 @bayarearetrofit5814 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-es_a1DcBXqk.html&ab_channel=%E9%99%B3%E6%B0%B8%E5%B4%A7 yeah they will have footing underground like this one.
My house had a real earthquake shake table test during the 1989 Loma Prieta earthquake here in California. We are about 12 to 14 miles from the epicenter. We had some broken dishes and a small crack in the fireplace chimney(didn't need repair). Fortunate, to the max.
It is a very interesting process. Would be very interested to see a compressed stabilised earth brick building tested for earthquake reisistance. It would also be interesting to see how having 2 1/2" and 3/4" gravel, bound together under a 15" thick raft foundation would stand up to an earthquake. A man used the gravel trick in the foothills of Adelaide, Australia, in the 1940's. His house was the only residence that did not crack in the 1950's earthquake, but, using fortecon plastic attracted white ants to his home. The idea is that the gravel takes the shock loading from the movement, and having a thick slab should allow the whole house to move as one. From my observations, if you tie a house together, and make it fairly solid, there is a good chance that it will be standing at the end of the earthquake, protecting those inside the home.
@@designstudio8013: Yes, am working on a project that has half inch deformed / twisted reinforcing every two feet vertical and horizontal, all core filled with cement. Then, in the upper levels, 3/8 inch sheet with 1 inch deformed bar, run at 45 degrees to the sheet with the crossing lines at random intervals, refer Citi building and Surfside Towers for my thinking. This is supported with 6 inch square hollow section that is tied into inner and outer walls, in both directions. This supports the floor on each level.
These look like massive earthquakes being simulated. You can make buildings stronger, but people can still get injured from falling/moving furniture. Truly terrifying. 😳
I think the point here is survivalibity rate. Better injured than be dead. We are talking about force of nature here be it earthquake, tsunami, tornado, volcanic eruption, human can only do so much against them.
osb or plywood bracing will make your house much stronger. Most modern houses are required by code. Older homes only have cross bracing by 2x4, which is not enough
It is enough. Wood houses are nailed. This makes the house flex in a quake. They are very safe in a quake. You are more likely to be injured by falling objects.
In these examples it seems to be the ground floor that fails first. Putting triangles into the building frame makes it more resistant to the shaking (you can't distort a triangle).
so basically, contrary to initial belief, I probably have a higher chance of survival falling 15-20ft by staying on the second floor, rather than staying on the ground and getting crushed by said falling floor
Use the construction methods they used in the Forbidden City in China. The reconstructed buildings can withstand a 10.0 quake. It's fascinating how much the building will move with the ground but still remain sound
very good simulation, I am totaly amazed by the look and quality of this test. It seriously simulated the danger of earthquakes. So I wonder one thing: how big is the chance for an old brick house, which is 50 years old, to collapse or taking harsh damage within a 5,9 earthquake?
It is not ''a real 3 storey building'' ... they are small scale models of three storey buildings and are made with the same materials, but in a smaller scale
@@myextrachannelireallydontn4155 no. All the skyscrapers and big buildings in earthquake zones are made from concrete. Don't comment on things you know nothing about
I saw a test on a cob home (mud) it broke apart completely into big chunks. Would like to see tests on rammed earth, straw bale, hemp, aircrete, earthships and soil in bags homes. Sometimes saving money can be very expensive in the long run.
Hi mori have you become a flat earther yet? If not I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe. I got it in my about tab.
its not that house dont crumble or take a hard hit, but its not burrying you alive for once. even if the house is a write off after. the people insinde come out alive.❤
lesson i learned: when there's an earthquake, immediately climb to the 2nd floor of the house and hide under the table with covered blanket... skipped the 3rd floor because it like likely will fall in the ground and the 1st will be crashed by 2nd floor..
I have to wonder about the magnitude of the earthquake being simulated starting around the 6 minute mark? This looks to be getting into even if the building is fine, you need to bolt down the furniture so you don't get hit and killed by it slamming into you. Maybe even sleep strapped to your bed so you don't get knocked off in the middle of the night.
Hi feeberizer have you become a flat earther yet? If not I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe. I got it in my about tab.
I've heard about stablizing systems that react to dampen earthquake waves. I'm not an engineer, but as I understand it the system reads the acceleration of the incoming wave and then a computer directs various hydraulics and springs to produce an opposing acceleration. It would be interesting to see a demonstration of this in action.
Hi westofearth have you become a flat earther yet? If not I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe. I got it in my about tab.
My apartment was recently shaken in the Sparta, N.C. 5.1 earthquake. At my location the shaking lasted at least a minute and a half, violently for 45 seconds. The lights now flicker constantly in the unit and the unit below me. Initially, several nails protruded from the top of random walls near the ceiling. Over time nails are protruding around most of walls near the ceiling and down some sections, they are also beginning to come through the ceiling plaster. Cracks are developing in the drywall, groans and very loud popping happens several times a day, primarily in the bathroom, it’s loud enough to wake you up. There is also a thumping noise in the living wall, and floors creak without stepping on them. The earthquake happened months ago, but the damage is progressing, is this a cause for concern?
Is it a cause of concern? YES! If you hear creaking, popping thumping MONTHS after the earthquake, and if you still experience poweroutages it IS a concern! A big one! Get a specialist to look at your building
@@infocook4854, I don’t think so… this is MONTHS after the earthquake, and this is after a relativily small one. If nails protrude, there are thumping/popping sounds and cracks are forming, the building prob shifted during the earthquake, and is under stress which should be chekced on just to be sure. I live in a earthquake prone area where all buildings are supposed to withstand up to 8m earthquakes, so I find it concerning that a building is showing so many stress signs after just a 5m one
Don't even wanna imagine if for some reason earthquakes started happening in Brazil, our houses barely function as is, if a single shake happens the country would collapse in an instant.
It’s not the earthquake that kills and injures, it’s the buildings many of which are fairly new and ‘earthquake proof’. Corruption and greed make builders take short cuts but the designers are under unfair pressure to build higher bigger for less money
The test showing the stick construction without plywood sheathing was a little biased. There was no lateral bracing on the building, which is what plywood sheathing provides, of course its gonna rock and move. And also, it didnt even look like that sheetrock was fastened to the wall.
What are your thoughts on older homes with 1x8 or 1x6 t&g used as the sheeting? If foundation is properly retrofitted do you think it will hold up ok vs plywood or usb sheeting?
#1 lack of SWS in front #2 weak connections #4 weak foundation anchorage. Poor connections, nailings, foundation anchorage, lack of SWS about covers it. The X bracing portal frame did a pretty good job but the one brace only failed in compression. Since we don't know how the models were built this is useless to all except an expert like myself.
A condo unit that my family owned before - well the 1st building collapsed during an earthquake. we were traumatized by that that we decided not to live in a condo ever again.
Plywood is better than the typical chipboard garbage they sheet houses with. Garage door opening sure makes a huge weak area in the corner. Even if the house doesnt fall down it's greatly weakened and out of plumb and likely would have to be torn down anyway
I'm assuming we're seeing the difference in nail counts, this is why new houses fail in small storms if its not nailed or built properly, a house should rip and splinter not fall apart in a split second.
What about a prefab home placed on shock absorbers, like the ones they have in a vehicle? Now I know why the Japanese didn't use much furniture, those wardrobes fall on you probably kill you.
Shame that no one uploaded the Soviet Earthquake test videos from the 60s and 70s, they designed cheap block buildings to withstand Earthquake at scales of 7 in case of nuclear explosion.
IT looks like there's an easy solution for this; install 4 steel beams on each corner of the 3-story house running parallel to the walls and imbedded in a 10-ft deep concrete foundation.
I wonder if they could build structures on a 'floating plate' - ie one that's decoupled from the ground. It could be held in place under normal seismic conditions by impact absorbing light materials, but when there is a sheer load, these materials would buckle and absorb the lateral load to reduce the movement of the central platform.
It all depends to on if the structure is higher than one story or not. A one story structures has a better chance of surviving because it's more likely to go with the shifting. But then again if the structure has a fairly heaving roof then the chances of survival decrease.
Everyone wants to tie the house to the foundation. But if it isn't the house as a unit would slip off. Then after the quakes, just tow the house back onto the foundation!
I was retrofitting an American house for a German guy. He said our construction was so cheap it reminded him of the houses built right after the war where they were built in a hurry with low-quality materials.
this is why their shacks fall apart > No rebar / No plywood bracing /..... Basically no standards or no brains in builders head. Little details, SAVE LIVES
hi jeffreywitty have you become a flat earther yet? If not I suggest watch a 13 part series called _What on earth happened_ by Ewaranon to learn that the earth is not a globe. I got it in my about tab.
@@bayarearetrofit5814 In your garage?! Obviously not in your garage! This irony of your answering does not make you interesting. Why do you talk to people that way?
What you have said here makes no sense. What does "irony of your answering mean"?, what do you mean "Why do you talk to people that way?" What way, give an example please. Please explain yourself clearly and I will give a clear answer.
Why you DON'T stand in doorways. It's never rubble, rubble doorway still standing, rubble rubble doorway still standing.... Lived in SoCal since 1980..
How do they make buildings earthquake proof in japan? If you put downward tension on a structure, would that preserve it? Karra just gave me that one....
To survive an Earthquake the structure must be able to resist shearing and overturning forces. Wood is the best material for this since it bends before breaking. isolation pads at the foundation work also or perhaps a boat?
Why can`t houses be built on the principle of a `steady cam` on the foundations = using pistons/dampers in all directions? and use shipping containers as temporary accomodation?
