1 / 20

Design Deviation Examples November 2011

Design Deviation Examples November 2011. ODOT Bridge Design Exchange Nov. 10, 2011. Design Deviations – Nov. 2011. During Design (better) More time to consider & refine proposal During Construction (not so good) Usually something has gone wrong Time and $$ pressure for resolution.

janine
Télécharger la présentation

Design Deviation Examples November 2011

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Design Deviation Examples November 2011 • ODOT Bridge Design Exchange • Nov. 10, 2011

  2. Design Deviations – Nov. 2011 • During Design (better) • More time to consider & refine proposal • During Construction (not so good) • Usually something has gone wrong • Time and $$ pressure for resolution

  3. Design Deviations – Nov. 2011 • R1 US30 at Eilertsen Creek Br 21455, kn 17037 • New bridge to replace culvert • Request for ACWS instead of Concrete • ADT favored concrete deck • Desire to finish in one in-water work period • District commitment to maintain ACWS

  4. Design Deviations – Nov. 2011

  5. Design Deviations – Nov. 2011 • R1 Hwy. 160 over Washington St. Br 21417 • Requested wider steel girder spacing, and “W” cross frames • Saved a girder line and some $$

  6. Design Deviations – Nov. 2011

  7. Design Deviations – Nov. 2011

  8. Design Deviations – Nov. 2011

  9. Design Deviations – Nov. 2011 • R2 Bundle 513 OR200 Bear Creek • Column Hoops: Construction request to use Caltrans “Ultimate Butt Splice” Weld instead of ODOT details • “Why?” Caltrans specs are rigorous for weld procedures and testing • Supplier (in CA) used automated welding equipment • Lab tests: bars broke first, welds held

  10. Design Deviations – Nov. 2011 • R1 US26 Bundle 511 • E. Fork Dairy Creek Br 21323, • McKay Creek Br 21322 • Prestressed Slab bridges • Std. ODOT details use ½” Strands • Design calcs used 0.6” Strands • Fabricator used same number of ½” Strands • Replace McKay slabs, Keep Dairy Cr. Slabs & make continuous over bents

  11. Design Deviations – Nov. 2011

  12. Design Deviations – Nov. 2011

  13. Design Deviations – Nov. 2011 • R3 I-5 Curtiss Creek Bundle 508 Br 21306 • Was designed & built • Load rating: Bent-2 Column inadequate for Live Loads • What to do?

  14. Design Deviations – Nov. 2011

  15. Design Deviations – Nov. 2011

  16. Design Deviations – Nov. 2011 • I-5 Curtis Creek, cont. • Early proposed solution: • Jacket column w/ reinforced concrete • Mech. splice vert. bars to shaft rebar • Bar tops: Resin bonded into X-beam • Our concerns: overhead drilling approx. 3’ deep, overhead resin bonding

  17. Design Deviations – Nov. 2011

  18. Design Deviations – Nov. 2011

  19. Design Deviations – Nov. 2011 • Questions? Discussion?

  20. Thank You kevin.f.davidson@odot.state.or.us 503-986-3342

More Related