1 / 30

NEES Quake Summit Thursday July 12, 2012 Seismic Design In Massachusetts

NEES Quake Summit Thursday July 12, 2012 Seismic Design In Massachusetts. 0.06. Eric M. Hines Principal, LeMessurier Consultants, Boston Professor of Practice, Tufts University. UBC 1970-1973. OCBF: V = 1820k SMRF: V = 753k. UBC 1976-1985. OCBF: V = 3067k SMRF: V = 1149k.

dore
Download Presentation

NEES Quake Summit Thursday July 12, 2012 Seismic Design In Massachusetts

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. NEES Quake Summit Thursday July 12, 2012 Seismic Design In Massachusetts 0.06 Eric M. Hines Principal, LeMessurier Consultants, Boston Professor of Practice, Tufts University

  2. UBC 1970-1973 OCBF: V = 1820k SMRF: V = 753k

  3. UBC 1976-1985 OCBF: V = 3067k SMRF: V = 1149k

  4. ATC 3-06 1978; MSBC 1997 OCBF: V = 1152k SMRF: V = 497k

  5. IBC 2006 (USGS 2002); MSBC 2008 2% in 50 year, Sa for T = 1.0s 0.06 OCBF: V = 985k SMRF: V = 273k

  6. LA/Bos 1.0 1.33 4.0 3.5-6.5 SMRF OCBF UBC 1970-1973 753 1820 UBC 1976-1985 1149 3067 ATC 3-06 1978; MSBC 1997 10% in 50 year 497 1152 IBC 2006 (USGS 2002); MSBC 2008 2% in 50 year 273 985

  7. Oakland San Jose San Francisco San Bernardino Vallejo Northridge Concord Riverside San Mateo Santa Rosa Santa Cruz

  8. Special Moment Frame Base Shear

  9. Hines , Baise and Swift (JSE—2011) (Prof. L.G. Baise, Tufts University) Site Class D: 1996 Maps = Category C 2002 Maps = Category B new Mass Code maintains special provisions based on 40 years of practice Vsavg = 695 ft/s soil profile adapted from: E.G. Johnson, “Geotechnical Characteristics of the Boston Area,” Civil Engineering Practice, 1989

  10. Hines , Appel and Cheever (EJ—2009) 9-Story Concentrically Braced Frame

  11. Hines & Fahnestock (Toronto—2010) Reserve System Concept

  12. For R=3 systems MCE seismic forces are 4.5 times higher, but in the East, wind almost always controls drift. Braced Frame with Reserve System or Moment Frame with Stiffening System

  13. 1927 Steel Frame Building

  14. 3700 kips of shear capacity at Level 21 (244’)

  15. Hines , Baise and Swift (JSE—2011) Eastern Suite, Site Class B

  16. 3/R=3 T=.69s 6/R=3 T=1.35s 9/R=3 T=2.07s 12/R=3 T=2.94s Hines , Baise and Swift (JSE—2011) NUREG Suite Amplified via Boston Stiff Soil Profile Sa (g) Period, T (sec)

  17. Hines , Appel and Cheever (EJ—2009) First Story Drift for 6-Story Models under GM6

  18. Hines , Appel and Cheever (EJ—2009) Behavior of 6-Story/R3 Model under GM5

  19. Behavior of 6-Story/WRS Model under GM5

  20. R=2 R=3 R=4 WRS Hines , Appel and Cheever (EJ—2009) 9-Story Fragility Curves

  21. R=2 R=3 R=4 WRS 3-Story Fragility Curves

  22. 1-Story Low-Ductility CBF+Reserve System 2 x Reserve 1/2 x Reserve

  23. Future Practice • Reserve capacity is a clear concept (belt and suspenders), so designers can make sense of what they are doing. • R = 3*, R = 5/5, WRS, Stiffened MRF

More Related