thank you all for coming really considered an honor to have the opportunity to share with you today some of the work that we've been doing over the past two years and i'm just delighted to have been asked to be part of this study that the university last inference has been asked to do it's a very vague kristie just opportunity for us to share what we have in terms of our knowledge about this peculiar structure so today we are going to be talking about a structural reevaluation of the collapse of world trade center seven what makes this is interesting in the ways that world trade center summit was not struck by plane it was a part of the complex and yet it failed in the afternoon so the national institute of standards and i honesty issued a report in two thousand and eight which could include that the structure collapsed because of and there's all kinds of different discussions about what may or may not have happened so i want to make it real clear here today what we did what in the way we approach this this project was undertaken to answer the question did fire cause this building to collapse that's that's our focus so we have been very careful to to let the science take us where we need to go and never once did i want to hear or understand where the all these different possible views might be being a very controversial subject so i try to to make sure that at the end of the day every day that they could the decisions that we're making the arguments that we're putting forth would defendable purely t science and so that's what we believe has come out of this through that process if i may back up for just a moment to do this process i was the director of this research i was fortunate to have dr funk scholl who been working on now for some time we are very pleased about its progress but there's many things i want to get yet and so today i will share that with you and when we get close to that i'll show you what what you might be expecting in the future about this and why  reluctant to share with you today that more importantly i want to let you know that what we're going to be putting out today is since it's a progress report this is not a traditional slide show where i have just pull up points there are some here where i have quite a bit of prose and the idea is that this will go out and make it available for you to read additional information if you would so choose to do that we're going to be trying to transparent we welcome any questions we're making everything that we have we we like you were typical airplane they did exist that wasn't available so we we've done the best we can we can with all the available documents and basically what we did is created out of drawing here that used we used to create a virtual basically and in digital form you should be able to see every piece every puzzle every member and it should look exactly like what was used in that in that structure and so that's what we did we then prepared an abacus non linear computer model for the connections and for the the framing of this building and so that is a fairly sophisticated fight another program that's available that enables you to look at in the detail how something is going to respond to your set of conditions so i don't i know that  i have a mixed audience here try to keep it as simple as i can at the same time i need to share with you some pieces of complexity so those in a technical reason i have an appreciation for the fact that ok so he did look at this in a fairly sophisticated way we've structure we were using most computer programs and two different people and each one of those each one of those us ph d student ph d people that were working for me they were doing these individual and i was their quality control sure that everything was the same and we'll be getting the same answers from two different approaches to different people doing things so we have quality control assurance this is a highly complex system so want to make sure that at the end of the day we were getting reliable results and then we and we can test it against thousand ad because was used to study progressive collapse we are using it to study progressive collapse i've not done with it yet so that's not going to share with you that basically what that means is that at the end of the day you look inside the building you see it come down does it look like what actually happened and that's the place where we are that ok virtual structure was used to sing like the conditions on september eleventh two thousand and one and we were going to share with you the findings and and i come and this is going to cure it so the findings today part one that was d c seven world trade center seven building was not found to be collapsed my fire that's my conclusion that's what we thought ok that's not consistent with the findings that were previously found by others findings are based on results the college of mines to do this work it should be pointed out that this is a known for profit corporation and the money that came to this study was out of the pockets of those professional engineers and architects it was it was going to  distribution of loads and if we can do an ok side so measure the bottom of the fifth floor you have these irregular conditions going on and that structure portion took care of that above the seventh floor the building structure was a typical two freight design with that is what we're looking at here that's what it looked like prior to september eleventh in plain view going to give you a different perspective here's the north there also so the northeast corner is where our game is going to we're going to spend our life in the next hour in that north east corner that's the farthest way from that era ok of that building left mind you this study is that it is really about why it came down this building was not struck by playing it collapsed that's got almost an overwhelming thought if you something about for we're looking at from a elevation view and try to take a look at the it's a very sides of this building and what it may have looked like here's  up so here is that with so here is the south and notice it's not as wide and then here is the west elevation and the east i wish i was in that context here for thirteen because that's where i put that there because we're going to spend a lot of time there so analysis are ongoing and when we finish that very soon i will make that available to everybody so you can see if i want to have them today but i'm not going to give you something that i have to change later if they feel my gosh i rushed it and it was wrong i'm not going to  if we use their assumptions so that's one thing the other thing we did is we simulate exactly what they did to see and if we came to the same conclusion and we do that by several things what number one is that this will this world trade center steel beams and steel frames using what they call sheer connectors in other words around round both that are actually well to the top flange and then when you pour the concrete all becomes what happened that was the concept composite structure but there are so many questions concerning the system we look at it from composite partially composite and i compiled that means the slab can slide over the steel not slide on the steel partially side of the steel we look at all those possibilities we looked at whether because of that wait it could not take nearly as much to love it as it was designed for and so consequently the vertical support a lot of restraint in north only and so therefore there's a huge problem and then that full level support up here and then there's partial which means you lost is that clear and i clear about what i'm saying here now let's take a look at their model for a moment there now is this is looking at a partial of that truck is going down here partial we're seeing a partial of this is the northeast corner there's home seventy nine and in that blue it's kind of significant not blue is where they put and every place a b and i and i and a murder probably gathered a column to murder close together and we do all these kind of things there is a connection a connection that's on the drawings that says here's on force eight to fourteen and that's been the blueberry over here that was undone so there's color seventy nine here's the airy outside of the thing and so now let's take a look outside the and does have so the next corresponding question is doesn't have an influence doesn't change how the system is going to respond and so the connections were not model for the exterior  and the columns themselves were treated as fixed so also over the past documentation page five twenty five two thousand eight hundred was considered to have lost vertical support with its web was no longer supported of something to think about why did that happen and it was late so some of the next results are the following and pardon me if i'm just kind of i hope i'm not boring you but this so anyway let's go on here's the next model that we were just looking and here are so this is the other side you see flipped them showing you where that modeling was actually done this is called seventy six seventy eight and so so in seventy nine percent here and so they they you have to ask yourself the question though is why is it so much different on one side than the other you see i'm saying and here what here's a place that day because of some damage that came in from the debris falling through the windows and stuff the building so one might argue that if if those things did happen with the building have collapsed ok so here we go this is the and we're going to be really conservative we're going to force things to happen it's worse than the real world ok and so do it if we can't force failure then it could happen are you with me on this point all right so that being said we're going to that or this condition we're looking at what we need to do and that is look at the boundary conditions to force that condition to be absolutely responsible ok we did that and so this is the beginning of most everything zero the stress and all zero we haven't put the ok so now let's take a look at what help else we look at and this is just part of the cause because we've been playing this game for two years so this is this is just a few weeks of stuff so the marshals the influx of the thermal expansion at the northeast corner for thirteen  didn't have the stickers and all of those things are going to give you a huge added resistance to anything going on it and in spite of the fact that i'm going to share with you some other things that makes it quite interesting we did that to examine that issue and that's where they are you can go and not when you're relaxing you can read these so then i'm not going to read it for you so anyway so we had this of quality control program by which we have two researchers and it was only in fun and each one of them doing the same thing much of the time trust and challenging each other with me there as a as a referee to make sure that what does that mean it means that there's a steel sheesh i guess i guess i don't know how to share that with you a magic imagine if you take just a straight line and you're dropping like a ship like a how it was put together there's how it's actually put together mathematically that's what starts looking like it's a behavior system and then we plan a curve for it and we can spring system so your ideas and so forth so they have what begins to look like moving with respect to this over in this area it's not moving with respect to this it's not moving with respect to that it's moving this way and that way with respect to what we call the thermal centr based on scientific fact and if there's a question we're there to to try to answer that and to make sure that our results are her true and value we're providing the study to be peer reviewed we are examining progressive collapse 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