EERI Seminar on Next Generation Attenuation Models Development of Corresponding Building Code “Design” Maps Nicolas Luco Research Structural Engineer USGS

EERI Seminar on Next Generation Attenuation Models

Development of Corresponding Building Code “Design” Maps

Nicolas Luco Research Structural Engineer

USGS – Golden, CO

USGS Workshop on Seismic Hazards of Guam/Northern Mariana Islands & American Samoa

MCE Map (≤‘09 IBC) MCER Map (’12 IBC)

Risk Coefficient Map

Risk Coefficient

0.55

- 0.65

0.65 -

0.75

0.75 -

0.85

0.85 -

0.95

0.95 -

1.05

1.05 -

1.15

1.15 -

1.25

1.25 -

1.35

1.35 -

1.45

1.45 -

1.55

1.55 -

1.65

FIGURE 22-22 RISK COEFFICIENT, 1.0 SEC. SPECTRAL RESPONSE PERIODFOR THE CONTERMINOUS UNITED STATES

Deterministic Map

%g

60 p

late

au

Plateau

60 -

75

SDC D

> 75

SDC E

Deterministic Map of 1.0 second Spectral Response Period(maximum component factor of 1.3)

Deterministic Map

%g

60 p

late

au

Plateau

60 -

75

SDC D

> 75

SDC E

Deterministic Map of 1.0 second Spectral Response Period(maximum component factor of 1.3)

Risk-Targeted Map (1%-in-50yrs P.C.)

%g

0 - 4

.2

SDC A

4.2

- 8.3

SDC B

8.3

- 13.

2

SDC C

13.2

- 35

SDC D

35 -

60

SDC D

60 -

75

SDC D

> 75

SDC E

Risk-Based Hazard Map of 1.0 second Spectral Response Period(maximum component factor of 1.3)

(min) (min)

Hazard Map(2%-in-50yrs P.E.)

%g

0 - 4

.2

SDC A

4.2

- 8.3

SDC B

8.3

- 13.

2

SDC C

13.2

- 35

SDC D

35 -

60

SDC D

60 -

75

SDC D

> 75

SDC E

Hazard Map of 1.0 second Spectral Response Period(maximum component factor of 1.3)

Hazard Curves+

scal

ing

to m

ax d

irect

ion

HAZARD Maps DESIGN Maps

e.g., 2014 Update of USGS Hazard Maps

2014 2016 2018

NEHRP Prov’s ASCE 7 Standard Intl Bldg Code


Design Maps Development Schedule

• Jan 3, ’12: Placeholder 2015 IBC change proposal submitted

• Jan 11, ‘12: Presented placeholder design maps to BSSC PUC

“Development of Corresponding Building Code ‘Design’ Maps,” N. Luco, USGS July 6, 2012



9) Design Maps for Guam

“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS January 11, 2012

Building Seismic Safety Council (BSSC) Provisions Update Committee (PUC) Meeting

ASCE 7-10SS

S1

SS

S1

2014 NEHRP?

Under

Rev

iew

Under

Rev

iew

300% g

315% g

75% g


9) Design Maps for American Samoa

“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS January 11, 2012


ASCE 7-10 2014 NEHRP?SS SS

S1 S1

Under Review

Under Review20% g

75% g

50% g



• Jan 3, ’12: Placeholder 2015 IBC change proposal submitted

• Jan 11, ‘12: Presented placeholder design maps to BSSC PUC

• Jan-Apr, ‘12: USGS hazard models completed (& published)

• May 5, ‘12: Requested disapproval of placeholder IBC proposal

• May 9, ‘12: Presented finalization plans to BSSC PUC …





• July, ‘12: Public workshop to finalize consensus hazard models

• July-Aug, ‘12: Ballot final design maps through BSSC PUC

• July 31, ‘12: Submit final design maps to IBC as public comment

• Aug-Sep, ‘12: Public forums in Guam & American Samoa

• Oct 9-10, ‘12: Resolve BSSC PUC vote/comments

• Oct 22-28, ‘12: Final Action Hearings for 2015 IBC

• Nov, ‘12: DOD Unified Facilities Criteria update finalized




Questions for Today

• Do the (published) USGS hazard models for Guam & American Samoa need to be revised?

• If so, in what way?

• If not, what are the explanations for the differences w.r.t. previous estimates (e.g. the 1997 NEHRP Provisions)?




9) Design Maps for Guam

“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS May 9, 2012


ASCE 7-10SS

S1

SS

S1

2014 NEHRP?

285% g

275% g

70% g


9) Design Maps for American Samoa

“Briefing on PUC Design Mapping Task Group,” N. Luco, USGS May 9, 2012


ASCE 7-10 2014 NEHRP?SS SS

S1 S1

15% g

40% g

30% g

Documents

EERI Seminar on Next Generation Attenuation Models Development of Corresponding Building Code “Design” Maps Nicolas Luco Research Structural Engineer USGS