Subject: Establishing Seismic Measuring Devices on Structures in So. Nevada Date: Wed, 27 Feb :58:
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1 Subject: Establishing Seismic Measuring Devices on Structures in So. Nevada Date: Wed, 27 Feb :58: Committee Members: Burt Slemmons Samaan Ladkanay Jim O Donnell Cathy Snelson Ron Lynn The attached pages were sent to all committee members by Lori Lopez <LORI@co.clark.nv.us>. The represent the report of the southern Nevada delegation on structural instrumentation in the southern Nevada region. Pages organized for posting on the internet by John Anderson, March 18, 2002.
2 PRIORITY #1: DOWNTOWN VIADUCT (EAST OF I-15 ON US-93/95) GEOLOGICAL: Bridge, Concrete, Tall Columns, Box Girders. Stiff Soil Located in Special Geotechnical Consideration Area; Subsidence and 2000 foot compaction or seismic fault buffer zone. In area of very high seismic ground amplification, expect amplification factors of 6-12 times higher Two down hole velocity surveys show low shear wave velocities by the Viaduct (Vs 1000 /s from ). Crosses Cashman-Whitney Mesa fault zone, M W 6.8 total max. Scarp height is up to 60m and surface rupture length is 30 km. Fault zone N-S Feet Variable. Major N-S/E-W Artery, Busiest traffic in Nevada. Being Studied for Seismic Retrofit. To Learn about Performance of Concrete Box Girders.
3 PRIORITY #2: MANDALAY BAY (S LAS VEGAS BLVD & HACIENDA) BASIN & SOIL Concrete Post-Tension Slabs. 20% on Cementations Material. 80% on Consolidated Silt/Sand Groundwater. Settlement problems. Known soil subsidence concerns in general area. Located in three areas of Special Geotechnical Consideration: Subsidence and 2000 foot compaction or seismic fault buffer zone; Solubility, clay swell, corrosion, gypsum salt, expansive or hydro-collapse potential drainage areas of recent sediment deposits. In area of high seismic ground amplification, expect amplification factors of 3-5 times higher Located 1 km East of Valley View fault zone, M w 6.8 total max. Scarp height is 25m and surface rupture length is 31 km. Between two fault zones. 43 stories Occupants, Proximity to major N-S thoroughfare. Soil Structure Interaction. **This major structure was completed after URS/Blume closed up shop in 1992.
4 PRIORITY #3: FIB TOWER (WEST OF PARADISE BETWEEN TWAIN & FLAMINGO) Located in two areas of Special Geotechnical Consideration: Potential drainage areas of recent sediment deposits; and Solubility, clay, swell, corrosion, gypsum salt, expansive or hydrocollapse potential. Located in Tropicana/Flamingo wash area. In area of high seismic ground amplification, expect amplification factors of 4-6 times higher Located between 2 major fault zones: 1.4 km west of mapped faults along the Cashman- Whitney Mesa fault zone, M W 6.8 total max. Scarp height is up to 60m and surface rupture length is 30 km; 1.2 km East of Valley View fault zone, M W 6.8 total max. Scarp height is 25m and surface rupture length is 31 km. Clean and simple 12 story steel frame structure good for modeling purposes. During the NTS testing years some instrumentation was deployed and some nuclear test induced motions were recorded on this structure. No damage complaints were ever filed on the FIB Tower. Potential for Advancement in Structural Response and Earthquake Engineering Research Studies.
5 PRIORITY #4: EXCALIBUR (S. LAS VEGAS BLVD & TROPICANA) Located in two Special Geotechnical Consideration Areas: Subsidence and 2000 foot compaction or seismic fault buffer zone; and potential drainage areas of recent sediment deposits. In area of high seismic ground amplification, expect amplification factors of 3-6 times higher Located 1 km East of Valley View fault zone, M W 6.8 total max. Scarp height is up to 25m and surface rupture length is 31 km. 28 stories, Masonry-concrete stem wall construction (1) High occupancy rates. (2) Tall building primarily constructed of masonry walls.
6 PRIORITY #5: CAESARS (LAS VEGAS BLVD & FLAMINGO) Located in two Special Geotechnical Consideration Areas: Subsidence and 2000 foot compaction or seismic fault buffer zone; and Potential drainage areas of recent sediment deposits. Located in Tropicana/Flamingo wash area. In area of high seismic ground amplification, expect amplification factors of 3-6 times higher Located in the Valley View fault zone, M W 6.8 total max. Scarp height is up to 25m and surface rupture length is 31km. 24 stories (1) High occupancy rates. (2) Empirical motion records from NTS. (3) Past formal damage, complaint investigations were conducted-damaged exterior architectural decorative block from upper levels. Advance engineering design studies for specific building element connections and ties.
7 PRIORITY #6: STRATOSPHERE (N. LAS VEGAS BLVD & ST. LOUIS) Concrete Located in Standard Geotechnical Consideration Area: Mixed alluvial sand and gravel. In area of high seismic ground amplification, expect amplification factors of 4-6 times higher Located between 2 major fault zones: 1.7 km west of mapped fault on the Cashman-Whitney Mesa fault zone, M W 6.8 total max. Scarp height is up to 60m and surface rupture length is 30 km; 2.0 km east of mapped fault on Valley View fault zone, M W 6.8 total max. Scarp height is 25m and surface rupture length is 31 km Expected large amplitudes of motion and displacement. (1) Natural period of perhaps 6 seconds with displacements of 5-6 at top. (2) Potential for high news media interest in recorded motions. (3) Marginal lateral load engineering oversight reviews
8 PRIORITY #7: GRANT SAWYER BUILDING (N. LAS VEGAS BLVD & WASHINGTON) Located in Special Geotechnical Consideration Area: Subsidence and 2000 foot compaction or seismic fault buffer zone. In area of very high seismic ground amplification, expect amplification factors of 7-14 times higher Located in immediate are of Cashman-Whitney Mesa fault zone, M W 6.8 total max. Scarp height is 61m and surface rupture length is 30 km.
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