Northridge 1994 Study: EQE International

Cambridge Earthquake Impact Database

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Earthquakes » USA 1994

Earthquake

USA 1994

Northridge

Study

EQE International

authors

EQE Intl.

Date

1995

Damage Scale

EQE's Own Damage Scale

Notes

The data are further divided into soil types, residential and non-residential, and also floor areas (heights for non-residential), The data presented here only distinguish between structure types and vintage.

Data breakdown only available according to MMI, not individual locations

id	Damage Levels
8	.05-.3	.05 to less than 0.3%
9	.3-1.25	0.3 to less than 1.25%
10	1.25-3.5	1.25 to less than 3.5%
11	3.5-7.5	3.5 to less than 7.5%
12	7.5-20	7.5 to less than 20%
13	20-65	20 to less than 65%
14	65-100	65 up to 100%
15	NA	Not assigned or zero

id	Building Classes
94	Wood Frame Pre-1941	Most examples not bolted to the foundation, many unbraced cripple walls
95	Wood Frame 1941-50	Bolting prevalent, however some unbraced cripple walls
96	Wood Frame 1951-60	Benchmark year in 1949 Uniform Building Code, most examples bolted and more slabs-on-grade
97	Wood Frame 1961-76	Larger houses, possibly lower factors of safety, wood quality not as high
98	Wood Frame Post-1976	Larger houses, better design details, increase in code design base shear, lower factors of safety, wood quality not as high
99	Steel Frame Pre-1941	General age break
100	Steel Frame 1941-56	General age break
101	Steel Frame 1957-76	1957 is considered by the city of Los Angeles to be the cut-off for steel framed buildings likely to perform pooly in earthquakes
102	Steel Frame Post-1976	Benchmark year in 1976 Uniform Building Code
103	Concrete Frame Pre-1933	Prior to 1933 Long Beach Earhquake code changes
104	Concrete Frame 1934-59	General age break
105	Concrete Frame 1960-76	General age break
106	Concrete Frame Post-1976	Benchmakr year in 1976 Uniform Building Code
107	Brick/Block/Other Concrete Pre-1933	Prior to 1933 Long Beach Earthquake code changes
108	Brick/Block/Other Concrete 1934-59	Majority assumed to be constructed of reinforced masonry
109	Brick/Block/Other Concrete 1960-76	Majority of industrial structures tilt-ups without positive roof-to-wall connection integrity
110	Brick/Block/Other Concrete 1976-91	Tilt-up benchmark years 1973 and 1976 Uniform Building Code
111	Brick/Block/Other Concrete Post-1991	Northridge earthquake indicated better performance of post-1991 designed structures, possibly due to icnreased lateral force requirement on roof-to-wall connections

Sources
The Northridge Earthquake of January 17, 1994: Preliminary Report of Data Collection and Analysis Part A: Damage and Inventory Data	EQE

Map Overlays

Study locations

USGS Key »

Study Locations

1 MMI <VI Locations

2 MMI = VI Locations

3 MMI = VII Locations

4 MMI = VIII Locations

5 MMI = IX Locations

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