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originally posted by: samkent
a reply to: turbonium1
Whatever mass that was supported, would be supported after the damage. The two buildings did not lose any structural support...not to any significant degree.
That has got to be one of the most ignorant statements I've seen on here in a long time.
originally posted by: samkent
a reply to: turbonium1
Whatever mass that was supported, would be supported after the damage. The two buildings did not lose any structural support...not to any significant degree.
That has got to be one of the most ignorant statements I've seen on here in a long time.
Scientists for 9/11 Truth
Bringing Closure to the 9/11 Pentagon Debate
911truth.org...
Pentagon Security Videos: Recent work on the video from two Pentagon security cameras shows that they captured images of the approaching, low-flying plane. In his paper “The 85 Pentagon Area Surveillance Cameras,” Ken Jenkins explains the images, how the date error came about, and the likely origins for the trailing white smoke. There is no evidence at this time that the government is withholding other images of the event captured by the surveillance cameras.
Ken Jenkins and David Chandler also recently took pairs of sequential images from the Pentagon surveillance video cameras, putting them together as you would see them in what is called a blink comparator. In this way, the image of the plane “pops out.” If you watch the image cycle a few times, the details of the plane are clearly visible. You can find the blink comparisons on David Chandler’s website, 911SpeakOut.org.
The 10 Worst High-Rise Building Collapses in History
www.bestonlineengineeringdegree.com...
6. Royal Plaza Hotel, Nakhon Ratchasima, Thailand
Police detained the owner of the Royal Plaza Hotel, the architect, and an engineer over allegations that three stories had been added to the building in 1990 without proper architectural review. Also, a huge amount of water was being stored on the roof of the hotel ahead of an expected water shortage.
4. Hotel New World, Singapore
After intensive research, investigators discovered a terrible error in the original design of the building. The structural engineer had completely left out the building’s “dead load,” in other words, the weight of the building itself, during the design process. As a result, it wasn’t strong enough to hold itself up. Tragically, Hotel New World was doomed from the beginning.
3. Three High-Rise Office Buildings, Rio, Brazil
On January 26, 2012, a 20-story building in Rio de Janeiro, Brazil spontaneously collapsed. The gigantic high-rise crashed into another ten-story building and a smaller “three or four” story building, reducing all three structures to one huge pile of rubble. The impact sent an enormous wave of dust and detritus through the streets of Cinelandia square, killing at least 17 people.
If the disaster had occurred just a few hours earlier, it would have resulted in mass casualties. Fortunately, the district, home to many office buildings and Brazil’s prized Municipal Theater, was pretty desolate due to the late hour of the collapse.
Authorities suggested that illegal construction work had weakened the 20-story building and caused it to fragment, which triggered a chain reaction and brought down the two smaller buildings. This catastrophe has led Brazilian authorities to call for reforms and stricter building and renovation regulations, especially ahead of the 2014 World Cup.
Nearly 360 buildings, homes at risk of collapse following Mexico City earthquake
globalnews.ca...
The risk of delayed collapse is real: The cupola of Our Lady of Angels Church, damaged and cracked by the Sept. 19 quake, split in half and crashed to the ground Sunday evening. There were no injuries.
Overloaded bins caused building collapse, two worker fatalities
www.ishn.com...
An Omaha building collapse that killed two workers and injured nine others was caused by overloading nine storage bins on the building's roof level, an OSHA investigation has found.
The January, 2014 incident at International Nutrition, Inc. occurred when a structural failure of the east side truss caused the bins to collapse down three floors into the center of the facility. OSHA determined that the bins that supported the east side truss were loaded with an excess of limestone. The extra weight caused the bins to collapse.
It is concluded that the improper removal of forms supporting the 23rd floor resulted in increased shear force around the columns. The recently poured concrete had not yet reached its full strength capacity and was unable to withstand these increased forces. Therefore, the trigger mechanism of the collapse was shear failure around a number of columns on the 23rd story. Without the support of these columns, other columns on that story were overstressed which ultimately led to the collapse of the entire 23rd floor slab onto the floor below. The increased loading on the 22nd floor from the weight of the collapsed floors above was too great and led to a progressive collapse all the way to the ground level
originally posted by: wmd_2008
a reply to: turbonium1
Tell the families of the construction workers killed on this site that a top down collapse of ONE floor cannot make it to groung level or stfu !
Skyline Towers collapse
It is concluded that the improper removal of forms supporting the 23rd floor resulted in increased shear force around the columns. The recently poured concrete had not yet reached its full strength capacity and was unable to withstand these increased forces. Therefore, the trigger mechanism of the collapse was shear failure around a number of columns on the 23rd story. Without the support of these columns, other columns on that story were overstressed which ultimately led to the collapse of the entire 23rd floor slab onto the floor below. The increased loading on the 22nd floor from the weight of the collapsed floors above was too great and led to a progressive collapse all the way to the ground level
So if you don't really know how things work don't comment
originally posted by: neutronflux
a reply to: turbonium1
From the top. Please cite from this rough recount of tower’s initiation of collapse, what violated the law of physics in anyway.
Studies on the WTC showed the WTC fire insulation protecting the steel was deficient.
The WTC design was a departure from best engineering practices in that it minimized cost and maximizes space by not using a concrete core that has saved other high rise building from total collapse.
Removing of vertical columns, structural failure from the jet impacts, heating by fire, and cooling from fires that weaken structural steel by 60 percent will cause constant load redistribution, expansion, and contraction, thermal stress by uneven heating, and dynamic loads that worked on the WTC until the vertical columns buckeled at the area of impacts. Areas that had the greatest damage to vertical columns. Areas that had the most load redistribution because of impacts removing the most vertical columns.
The jet impacts remove large area of already deficient fire proofing from the areas it was most needed on 9/11.
The fires raged. The heat caused the steel to become more pliable and expand. When the floor trusses could no expand because of the vertical columns, it was easier for the trusses to droop. When the drooping floor trusses cooled and contracted, they pulled in the vertical columns to cause them to bow. Once the bowing became to great, the bowing caused the vertical columns to buckle and fail. As evident in the video in this linked to thread: the-pre-collapse-inward-bowing-of-wtc2.t4760/
www.metabunk.org...
The falling upper portion of the towers fell into the first static floor. The falling mass caused the shearing of floor connections. Not vertical columns. The vertical columns only toppled after losing the complete side to side support of the floor system.