Structural analysis of the twin towers

In this article, one of the main issues is that the tower’s structural engineer, Lee Robertson, addressed the problem of terrorism in the plans for the building, claiming he “designed it for a (Boeing) 707 to hit it”. In the center of the tower there is a central support core. This core is built of sheer concrete reinforced by 44 beams of construction grade steel, which were sealed in asbestos. When the plane hit the north tower it took a direct hit to the core, but the plane that hit the south tower went in on an angle, almost parallel to the core structure. The fuel barley grazes the core of the south tower, with most

In addition to how the towers fell, we must understand the properties of steel. Because the Twin Towers were built from steel and capable of

Did you know, that one person escaped the tower with seconds to spare? A man named Ron DiFrancesco was trying to escape from the South tower, after the North Tower had been attacked, when the second hijacked plane hit between floor 77 and floor 85 of the South Tower. The explosion threw him against the wall, but, however, he was able to carry on to the ground floor from floor 81 in the same time the building was standing after the attack, and then it had collapsed behind him as he was escaping from the building. The attacks on September 11, 2001 had many important effects such as a change in immigrations laws, starting wars, and changed airport rules.

Federal Emergency Management Agency (FEMA) issued a preliminary report on May 2002 using video footage and annotated foundation plans. FEMA made findings that the collapse was solely caused by fires on multiple stories. It was lit by debris from the other two towers that burned for a long time as a result of the lack of manual firefighting and water sprinklers. The report didn’t find anything that would give a definite answer as to why the building fell and so it prompted for a further investigation.

American Airlines Flight 77 circled over Washington, D.C., and soon slammed right into the Pentagon military headquarters around 9:45 a.m. Due to the immense jet fuel, most of the building collapsed. “All told, 125 military personnel and civilians were killed in the Pentagon, along with all 64 people aboard the airliner.” As this devastating site was being broadcasted all over America, the horror in New York took place. The south tower of the World Trade Center immediately collapsed into smoke. Due to the burning jet fuel, the structure of the skyscraper couldn’t withstand the heat. Less than a half hour later, the other tower of the World Trade Center collapsed. There was close to

The 9-11 attack on the Twin Towers was the most scandalous terrorist event to triumph the USA on its home territory since Pearl Harbor was attacked in WW2. 9.11 took place September 11, 2001, when New York's World Trade Center crashed to the ground. But... Is the official version of events really what happened?

The World Trade Center (WTC) represented American pride and influnce. The twin towers stood 1,352 feet with 110 stories. It was finished in 1971. The morning of September 11 no one knew that four flights would be hijacked to take American lives and using two of them to bring down the World Trade Center. Yes there had been warnings that an aviation attack would happen but who knew when it would happen and how would it have been prevented. Flight 11 American Airlines (AA) hit the North Tower around 8:46 am between the

The Twin Towers was an emblematic part of our country. Reaching one hundred and ten stories, the Towers were among a group of seven buildings in downtown Manhattan. The Pentagon was 4 stories tall and the biggest office building.

The World Trade Center stood to be built as a reflection of peace with a fierce ambition and disciplined achievement on a massive scale. The statement of these buildings was to construct an uplifting stamina of downtown Manhattan. Its purpose created both a negative and positive aspect in its construction to help those in need of it, but it also caused some damage in its creation. Its massive scale as buildings allowed the people of New York City to see it as a symbol of expansion in that particular area of Downtown Manhattan from it reign being the peace towers to the construction of the Freedom tower. The reasons as to why the Twin Towers was an expansion for downtown Manhattan it allowed the extended invitation for international trade and

Please describe: (a) the structural frame of WTC 7, and (b) how major loads were transferred in WTC 7. (10 point)

In examining the way the twin towers collapsed, the way the towers fell was not consistant with the collision damage as it demonstrated a “scheduled” and “controlled demonlition” type of collapse as explained by the Leak Video interview titled: Architects & Engineers for 9/11 Truth. Richard Gage, the interviewed architect for the video, and respected AIAI san franscico bay area architect, helps illustrate the clear notion that the twin tower collapse was not from the direct damage of the planes primarly because of the way the building fell, and the damage shown during and after the fall.

After the September 11 attacks, plans were quickly drawn up to rebuild the World Trade Center. After a contest was held to redevelop the complex, a proposal from architect Daniel Libeskind was selected as the winner in 2002. At the centerpiece of Libeskind’s proposal was a new signature tower for the complex intended to soar to a symbolic 1,1776 feet into the air.

Branded as the tallest structure in the Western Hemisphere, the One World Trade Center (One WTC) stands tall as a symbol of revival. When people look to it, they marvel at the praiseworthy façade and design. However, aesthetics come with a price; a price much too great to leave unaddressed. At a whopping 3.9 billion dollars, the One WTC holds the record with the most expensive construction costs. Even the use of building information modeling could not diminish the overwhelming 1.9 billion dollar increase from the original cost estimate. Just as for all construction projects, cost overruns are caused by a variety of unanticipated circumstances. Whereas for the One WTC, the phrase: “political pressure” perfectly sums up the causes for the

The attack had devastating outcome that traversed across many sectors of the economy. In fact it took a nearly a month to figure out the next course of action (Hiles, 2007). Meanwhile, rescue mission intensified as a result of disaster declarations, businesses were closed down, the building was considerably destroyed and many companies rerouted their telecommunication and information channels and systems to alternative sites (Hiles, 2007). Smoke was everywhere and this caused health complications to people trapped inside the tower for a longer time. Security alert intensified throughout the US as people worried which was the next place to be attacked.

One theory that seems to have some validity is that the planes did not cause the World Trade Center to collapse, but rather that there were bombs that were set off to make the buildings collapse shortly after the planes hit them. The planes were just used as a distraction while the bombs were being set off. According to YouTube video 9/11: Controlled Demolition Comparison, buildings tend