Wednesday, April 23, 2014

Is the SSTC the next Kansas City Hyatt Regency Walkway?

"On the evening of July 17, 1981, approximately 1,600 people gathered in the atrium to participate in and watch a dance competition.[6] Many people stood on the two connected walkways. At 7:05 p.m. the second-level walkway held approximately 40 people with more on the third and an additional 16 to 20 on the fourth level who watched the activities of the crowd in the lobby below.[4] The fourth floor bridge was suspended directly over the second floor bridge, with the third floor walkway offset several meters from the others. Construction difficulties resulted in a subtle but flawed design change that doubled the load on the connection between the fourth floor walkway support beams and the tie rods carrying the weight of both walkways. This new design was barely adequate to support the dead load weight of the structure itself, much less the added weight of the spectators. The connection failed, and the fourth-floor walkway collapsed onto the second-floor walkway. Both walkways then fell to the lobby floor below, resulting in 111 deaths at the scene and 219 injuries. Three additional victims died after being transported to hospitals, bringing the total number of deaths to 114.[7] ... The Hyatt tragedy remains a classic model for the study of engineering ethics and errors (as well as disaster management[23]). 

http://en.wikipedia.org/wiki/Hyatt_Regency_walkway_collapse

http://www.youtube.com/watch?v=tR_N6lyTxj0

Unfortunately, it happens. Errors and omissions can lead to horrible disasters. KCE's report, that Montgomery County commissioned, and has been available on Montgomery County's website for more than a year, attributes the SSTC's total lack of expansion joints, its widespread cracking, slabs thinner than they're supposed to be, exposed reinforcement, missing reinforcement, underdesigned beams, understrength and overstressed concrete, etc. to errors and omissions by the SSTC's contractor/builder, engineer/designer and concrete inspector/tester and special quality inspector.

Do you trust the opinions of only those who have been involved in the project, who have a lot to lose if the SSTC is deemed unsafe, and who are paid for by Montgomery County? I don't. I want the opinions of independent experts who haven't been involved in the project to date, who aren't paid for by Montgomery County, who don't have ties to this region (including its politics), and who don't have anything to lose (e.g., current or future business) by being totally objective, and finding that the SSTC is unsafe, if that's the case.

Finally, who's been controlling information that's been made public for the SSTC for the past year? ... primarily, politicians and the news media. Needless to say, neither politicians nor the news media are independent construction and/or engineering experts.





No comments:

Post a Comment