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Re: Thank you, M.Harris! etc....
Author: M. Harris
Date: 05-27-2013 - 21:18

George:

I wish there was a simple answer to your questions. Load factor (also known in past years as Safety factor) calculation is complicated. To be as simple as I can in explaining this, around 1950 the dead load factor was 1.3 and live load factor was 2.17, generally speaking, for load bearing structures. In recent years design has moved to Load Resistance Factor Design (LRFD), in which each type of load gets a different factor depending on the reliability of the design information (known strength of steel from testing, load tests on foundation members as construction progresses, level of inspections, certifications, types of field tests performed, etc. In simple terms, greater certainty about how the structure is going to be built can allow a smaller factor of safety in design. This ends up meaning there is no single common number for bridges, since there are many variables that go into the number calculation. Much of this is beyond my current level of practice, so if you would like more technical bases for the explanation, there is a good reference here:

[www.oldcastleknowledgecenter.com]

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Subject Written By Date/Time (PST)
  Interstate-5 bridge collapses into river north of Seattle Ken Shattock (KRK) 05-23-2013 - 21:35
  Re: Interstate-5 bridge collapses into river north of Seattle Pdxrailtransit 05-23-2013 - 22:00
  Re: Interstate-5 bridge collapses into river north of Seattle mook 05-23-2013 - 22:06
  Re: Interstate-5 bridge collapses into river north of Seattle Jon 05-23-2013 - 22:14
  Re: Interstate-5 bridge collapses into river north of Seattle SoCal Commuter 05-23-2013 - 23:49
  Re: Interstate-5 bridge collapses into river north of Seattle BN Oly 05-24-2013 - 22:15
  Re: Interstate-5 bridge collapses into river north of Seattle Washington State Resident 05-24-2013 - 11:11
  Re: Interstate-5 bridge collapses into river north of Seattle EOT 05-23-2013 - 22:35
  Re: Interstate-5 bridge collapses into river north of Seattle John Holloway 05-24-2013 - 00:11
  Re: Interstate-5 bridge collapses into river north of Seattle John Holloway 05-24-2013 - 00:16
  Re: Interstate-5 bridge collapses into river north of Seattle SGB 05-24-2013 - 09:12
  Re: Interstate-5 bridge collapses into river north of Seattle PNWRailfan 05-24-2013 - 12:21
  Re: Interstate-5 bridge collapses into river north of Seattle Dave Smith 05-24-2013 - 16:36
  Re: Interstate-5 bridge collapses into river north of Seattle Martin Burwash 05-25-2013 - 19:12
  Re: Interstate-5 bridge collapses into river north of Seattle Dan 05-26-2013 - 17:42
  Re: Interstate-5 bridge collapses into river north of Seattle Tim Eyman 05-24-2013 - 14:29
  Security Camera Footage Pdxrailtransit 05-24-2013 - 16:41
  Re: The View from Behind The Wheel... George Andrews 05-24-2013 - 21:01
  Wow! Pdxrailtransit 05-24-2013 - 21:20
  WOW! THANK you, George! Margaret (SP fan) 05-24-2013 - 22:48
  Re: The View from Behind The Wheel...--Thank U George Daniel3197 05-24-2013 - 22:52
  Re: The View from Behind The Wheel...--Thank U George Stash 05-25-2013 - 00:06
  Re: The View from Behind The Wheel... Tom Travis 05-25-2013 - 05:57
  Re: The View from Behind The Wheel... L.A.Scrafford 05-25-2013 - 07:47
  Re: The View from Behind The Wheel... Dave Smith 05-25-2013 - 09:44
  Re: The View from Behind The Wheel... George Andrews 05-25-2013 - 20:35
  ReTotal weight of a heavy truck -- isn't that what matters?? Margaret (SP fan) 05-26-2013 - 09:50
  Re: ReTotal weight of a heavy truck -- isn't that what matters?? M. Harris 05-26-2013 - 14:07
  Re: ReTotal weight of a heavy truck -- isn't that what matters?? M. Harris 05-26-2013 - 14:17
  Re: ReTotal weight of a heavy truck -- isn't that what matters?? mook 05-26-2013 - 18:05
  Re: ReTotal weight of a heavy truck -- isn't that what matters?? Ken Shattock (KRK) 05-26-2013 - 19:24
  Thank you, M.Harris! etc.... Margaret (SP fan) 05-27-2013 - 00:26
  Re: Thank you, M.Harris! etc.... George Andrews 05-27-2013 - 09:21
  Re: Golden Gate Bridge-Margaret SP... Ken Shattock (KRK) 05-27-2013 - 10:29
  Re: Thank you, M.Harris! etc.... M. Harris 05-27-2013 - 21:18
  Re: ReTotal weight of a heavy truck -- freight car applications Dave Smith 05-27-2013 - 11:08
  Re: ReTotal weight of a heavy truck -- freight car applications George Andrews 05-27-2013 - 17:11
  Re: ReTotal weight of a heavy truck -- freight car applications Dave Smith 05-28-2013 - 19:07
  Re: Interstate-5 bridge collapses into river north of Seattle BOB R 05-27-2013 - 17:48


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