Report on US ActivitiesReport on US Activities

ICOLD 84th Annual MeetingCommittee on Seismic Aspects of Dam Design

Lelio Mejia, PhD, PE, GEChair, USSD Earthquakes Committee

May 17, 2016

OutlineOutline

• USSD Earthquakes Committee– Membership– Current initiatives

• Key US Seismic Projects• Other Activities

USSD Earthquakes CommitteeMembership

USSD Earthquakes CommitteeMembership

ENG SEW AW (2016) PETER J. HRADILEK (2015)

DONALD H. BABBITT (vice) (2015) DINA HUNT (2015)

JOHN BARNEICH (2015) C. MICHAEL KNARR (2015)

MICHAEL H. BEATY (2015) RICHARD W. KRAMER (2015)

MOHSEN BEIKAE (2015) C. ERIC LINDVALL (2015)

ROSS BOULANGER (2015) FAIZ I. MAKDISI (2015)

BRUCE BRAND (2015) LELIO MEJIA (chair) (2015)

THOMAS BROWN (2015) JACK MONTGOMERY (vice) (2015)

WILLIAM BROWN (2015) LARRY NUSS (2015)

CLINTON CARLSON (2015) WARREN J. PAUL (2015)

KERRY CATO (2015) PHOEBE PERCELL (2015)

JOSEPH L. EHASZ (2015) MARC RYAN (2015)

NICOLAS VON GERSDORFF (2015) MARK SCHULTZ (2015)

YUSOF GHANAAT (2015) JOHN C. STOESSEL (2015)

GEORGE F. HOROWITZ (2015) JENNIFER HUGGINS (2015)

• 30 members• Owners, regulators, consultants

Current InitiativesCurrent Initiatives

• Publications– Guidelines for seismic deformation analysis of

embankment dams– Update of guidelines for seismic hazard analysis

and selection of ground motion parameters for dams

– Update of guidelines for seismic design and evaluation of structures appurtenant to dams

• Workshop on seismic analysis of concrete dams: “Blind Prediction of Seismic Response of Monticello Dam”

Monticello DamMonticello Dam

• SS• Napa County, CA• Medium Thick Arch

Structure• Height: 93 m• Crest length: 312 m • Crest width: 3.7 m• Source: www.usbr.gov/projects/

Recorded Dam Seismic ResponseRecorded Dam Seismic Response

• M 4.1 at 16 km on 22 May 2015• Ground motions recorded at foundation bedrock and crest• Six international participant teams were given: Dam

characteristics, material data, and bedrock motions• Teams were asked to develop models and predict crest motions

Monticello Concrete Young’s ModulusMonticello Concrete Young’s Modulus

Predictions of Acceleration Response Spectraat Crest Center

Predictions of Acceleration Response Spectraat Crest Center

Predictions of Acceleration Response Spectra at Crest Quarter Point

Predictions of Acceleration Response Spectra at Crest Quarter Point

9

Expect full report in 2016

Key US Dam Seismic Projects (1)Key US Dam Seismic Projects (1)

• Echo Dam Retrofit, USBR, Utah• Upstream and downstream buttresses

with shear keys to rock• Spillway structure retrofit

Key US Dam Seismic Projects (2)Key US Dam Seismic Projects (2)

• Perris Dam Retrofit, DWR, California• DSM foundation treatment and downstream

buttress

Key US Dam Seismic Projects (3)Key US Dam Seismic Projects (3)

• Calaveras Dam Replacement, SFPUC, California• New replacement embankment dam, downstream

of existing dam• New spillway and outlet works

Key US Dam Seismic Projects (4)Key US Dam Seismic Projects (4)

• Lake Isabella Dam Retrofit, USACE, California• Downstream buttress on alluvium foundation

treated with shear walls• Special zoning for foundation fault rupture• New spillway and dam crest raise

Key US Dam Seismic Projects (5)Key US Dam Seismic Projects (5)

• Anderson Dam Retrofit, SCVWD, California• Upstream and downstream buttresses on rock• D/S buttress zoned for foundation fault rupture• New outlet works design for fault rupture• Spillway enlargement and crest raise

Other ActivitiesOther Activities• 6th International Symposium on Hydraulic Structures,

June 2016, Portland, OR• International Symposium on the Mechanics of

Internal Erosion for Dams & Levees, Aug 2016, Salt Lake City, UT

• Protections 2016, International Symposium, Colorado State University, Sept 2016

• USBR Workshop on “Assessing the State of Practice in Seismic Analysis of Dams”, August 2, 1016

• National Resources Council Project on ” State of the Art and Practice in Earthquake Induced Soil Liquefaction Assessment”, Report in 2016 at: https://www8.nationalacademies.org

• TVA Engineering Guidance Document for “Seismic Assessment of Embankment Dams”, Report in 2016

Thank YouThank You