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Home My WebLink AboutFS 2008-09-03 Item 2A - Presentation - Seismic Evaluation Results INFORMATION MEMO To: From: Date: Subject: Mayor Haggerton Public W orks Directo~ August 28, 2008 Seismic Hazards Screening Report Please Bring Your Copies of the Evaluation Report. ISSUE Review results of Seismic Hazards Screening Evaluation. DISCUSSION Reid Middleton was contracted to provide Seismic Hazard Screening and Reporting services, using FEMA 154 and ASCE 31-03 screening criteria for nine City buildings (Minkler Shops was separated into three separate structures). The screening and evaluation looked at the buildings' expected structural performance for the Immediate Occupancy performance objective. The Immediate Occupancy performance objective was chosen because each of the facilities being evaluated perform a critical function/service for the community and would be needed during a disaster and the during the recovery period following the disaster. All of the buildings, with the exception of Fire Station 53, were found to have seismic deficiencies and do not meet the Immediate Occupancy performance objective. Concept-level seismic upgrade designs have been completed and are provided describing the options to mitigate structural deficiencies. Cost estimates for the seismic upgrades have also been developed. RECOMMENDATION Present to the Committee of the Whole for consideration. C:\temp\XPGrpWise\Info r~emo Seismic Screening Report.doc Seismic Improvements Program Study Results August 2008 Reid Middleton Facilities Overview importance Dsplacem -d proeCt Sc r e e"Q Results Rapid Visual Se ism► a nation Results ConcePt-Level 5 r etailed Seismic e smiC U `�"9r`• Cost Estflates end City Hall (i) Public Work Engineering Fire Station 51 riN Fire Station 52 Fire Station 53 To Fire Station 54 Workroom, Covered Parking (0) George Long Shops Tukwila Community Center 166,000 SF City Hal, Po ice/Pub ic yorks„ rA Fir- Stations, 2 Sho s Facilities, 1 Co muni1 Ce ter Co str cti t• e 'fir 1961 to 19 5 to 20 0 Person Occupant Load Cost to Upgrade? [stab ish Jpgrade Priorities City of Tukwila. Seismic Improvements Program August 2008 Building Name Tukwila City Hall 6300 Building Fire Station 51 Fire Station 52 Fire Station 53 Fire Station 54 Minkler Shops Buildings George Long Shop Tukwila Community Center Totals No. Stories Area 2 27,000 SF 2 33,600 SF 2 17,700 SF Precast Tilt -Up Concrete 1 1 1 1 Structure Type Wood Frame, Concrete Wood SW Wood Frame, Concrete Wood SW, Steel Frame 3350 SF Precast Tilt -Up Concrete Wood Frame, Wood Masonry 14,000 SF SW 5,300 SF Masonry Bearing Wall 20,750 SF Precast Tilt -Up Concrete 2 18,500 SF Pre Engineered Metal Bldg. Wood Frame, Wood Masonry 1 55,000 SF SW 166,000 SF Year Built 1977 31 300 1978 30 300 1973 35 15 1971 37 10 1995 13 15 1961 47 10 1972 36 100 1965 43 150 1995 13 1100 2000 Occupant Age Load Use Administration /Police/ Court Public Works /Engineering /Police Emergency Services Emergency Services Emergency Services Emergency Services Public Works Shops Storage Vehicle Maintenance Recreation City of Tukwila Seismic Improvements Program August 2008 proceC' Screening •d Visua,, MC 5C fl,&Ran at0 Eu aIu Se ►sm Detailed SCE. 3 rring ion Checklist Scree tailed Ev a1uat bier 1 hec More De Tier 2 Quick C on T ►e Evaluat► Detailed Des ►gn ►er 3 Basedl 6 Perform b�ectives ScE 4 O ance ectW ed or En ance oba Determine Limited Levels Per�Orr�n �e E.Q. Le E E •Q Budget D Overall ®nstruct►on Do Establish Design an d C Ce Detailed D Prepare abduction zone earthquakes (1700) lC 0 sin Crustal earthquakes 4 (900 AD„ 1872)\ Deep earthquakes (1949, 1965 2001) City of Tukwila Seismic Improvements Program August 2008 Site Specific Seismic Hazards Prob. Seismic I-lazard Dexagregatiovi City of Ttitcwila_ 122.24:1° 41.49214. Peak 'Rail. G oa conn tvflak (11,.M.,,E)=--- 5.0 lam 6.63, -122 ticarn peak R.V1 bin), Wan newel.), Ilene 4'75 yeacs 'Moda (P. ,D.8.,en 53,.S ken„, .00,1 to 2 sizna cicorn peak 9,,s,11.,g. bin) Vez:n (R.M.E6) 3'7.1 ken, 6.55., 0.6,2. Binning: Deltan 10. ken, dektitylA.2, Deltas-s-,1.0 4 .s 4 3 2033 upctte USGS PSHA -1 1.5 4. 23-0203EIJVCIO 1":"A:21,7 dsianto "roanitIdo Os, avaixon EO,E) daa ggragaiton is 3 IVO en FOCI,: ano4 V.1.760 WI lop rn 1.19GS CC4-rt (614,40024 TIO:it ilyls volt lt 005% cortirib. crririad Lateral Shear Demand Lateral Deformation City of Tukwila Seismic Improvements Program August 2008 Screening for Structural Discontinuities Screening - Plan Irregularity Screening - Vertical Irregularity Rapid Visual Screening Inventory and Scores Relative Structural Rank Building Description Scores, S 1 Tukwila Community Center 0.7 2 6300 Building 1.2 3 Fire Station 51 1.5 Minkler Shop Office and 4 Repair 1.5 Minkler Shop Work Room 5 and Storage Bins 1.5 Minkler Shop Covered 6 Parking 7 Fire Station 52 8 George Long Shop 9 Fire Station 54 10 Fire Station 53 11 Tukwila City Hall City of Tukwila Seismic Improvements Program August 2008 Seismic Evaluation - City Hall 11 2-Story, Wood Framed 0 ill 27,000 SF, 1977 Construction Incomplete/ on-Orthogonal LIRS Vertical Disconti ity Overstressed ood Shear ails ood all Hold-Downs Discontinuous Load Path in Diaphragms Overstressed Concrete Shear ails Foundations City of Tukwila Seismic Improvements Program August 2008 Add Wood Shear Walls Add Hold -Downs at Existing Wood Shear a Is Strengthen Posts anc Columns IN Add ra Strut d Collect E ements dd Diagonal Bracing dd /Improve C• ncrete Shear Walls Improve Fou ndati ns Structura Recommendation Retrofit Existing Structure City of Tukwila Seismic Improvements Program August 2008 Concept Level Seismic Upgrades - City Hall 3-Story, Wood Framed, Concrete/Wood S'lear Walls 33,600 SF, 1978 Construction Overstressed Upper Floor old Shear Overstressed C. ncrete Slear ails Overstressed Foor a d Roof Diaphragms eak Steel Mo ent Frame Joints 1,r 11 City of Tukwila Seismic Improvements Program August 2008 Seismic Evaluation - 6300 Building Add Steel Moment Frames Longitudinally Add Steel Braced Frames in Transverse i rectio d Spr ad F u ra,t ns dd Steel Co m s dd rag Struts Structural Recommendation Retrofit Existing Structure City of Tukwila Seismic Improvements Program August 2008 Concept Level Seismic Upgrades - 6300 Building 2- Story, Tilt -Up Concrete, ood Gravity Framing 17,7 0 SF, 1973 C• nstr ction Overstressed ncrete Shear ails Overstresse• o,• d Chi p rag ms o it iaphragm C• (lector Elements Overstressed GWB Walls Inac eq uate Floor oof to Wa f Ties Liquef.ction tenti City of Tukwila Seismic Improvements Program August 2008 Seismic Evaluation - Fire Station 51 a Add Wood Shear Walls e Add Concrete Moment Frames cd Steel oment Frames O Shotcrete Existing al s 8 o iaphra I m C Hector 1 Elements a dd Pra. Strut Elements Improve all to "oof/Floor Ties a Compaction Grouting to Mitigate Liquefaction Potential Structural Recommendation Replace Structure City of Tukwila Concept Level Seismic Upgrades - Fire Station 51 Seismic Improvements Program August 2008 Seismic Evaluation - Fire Station 52 1-Story, Wood Framed 3,350 SF, 1971 Construction isc ntinuous L ad Path verstresse• sod Shear aF s lir I; Inasequate verstressed Diaphrag s 111, oof to Wall Ties 1 0 City of Tukwila Seismic Improvements Program August 2008 Add Wall to Roof Ties Add Sheathing and Hold -Downs to Wood Walls odify Existing earn Connections to ct as rag Struts Structural Recommendation Retrofit Existing Structure City of Tukwila Seismic Improvements Program August 2008 I ed, S 1-Story, ood FramVIRF in Apparatus Bay 14 ,000 SF, 1995 Construction Newer Construction No Tier 2 Defidencies vi 1Story wood Framed, Wood 'Masonry UCtOfl 300 S Overstressed Masonry Walls erstressed ood Shear Ov Walls 0 Inadequate Diaphragm Collector Elements Inadequate Diaphragm Shear Capac‘ty Seismic Evaluation - Fire Station 54 Add Masonry Wa° s Shotcrete Existing Masonry Wa! Is Remove Hose Tower Expand Fou dations pgrade ood Siear Walls dd rag Struts Re- Sheath oof iaphragm Structural Recommendation Retrofit Existing Structure City of Tukwila Concept Level Seismic Upgrades - Fire Station 54 Seismic Improvements Program August 2008 Reid iddleton 1-Story, Tilt-Up Concrete Framing, 3 uildings on Site 20,750 SF, 1972 Construction Overstressed Concrete Shear ails Inadequate rizontal iaphragm Capacity Insufficient Out-of-P ane Wail Ties Added Mezzanines Liquefaction Potential City of Tukwila Seismic Evaluation - Minkler Shops Seismic Improvements Program August 2008 Improve Roof to Wal Ties ,dd Masonry Shear Wa Is Shotcrete Existing Concrete Walls dd Concrete al s ver- Sheath o Diaphragms Add Diaphragm Chord Elements Compaction Grouting to Mitigate Liquefaction Potential la Structural Recommendation Retrofit Existing Structures City of Tukwila Concept Level Seismic Upgrades - Minkler Shops Seismic Improvements Program August 2008 444. 4440.14 r■ 4 4.4k AtIANIN 1 !11 1 1-Story, Masonry, Steel, ood Light Gauge Metal Framed, 55, 00 SF, 1995 Construction Weak nd Ins fficient ood Shear ails Insufficient d all old-Do ns Some Gym Masonry Walls Overstressed m Overstressed Diaphragms Liquefaction Potential City of Tukwila Seismic Evaluation - Community Center Seismic Improvements Program August 2008 s Add sheathing and Nailing to Wood Shear Walls Improve WoOd Wa I Hold Downs Add Concrete 8i Masonry Wails Strengthen oof Diaphragms Add Drag Struts to Roof Diaphragms Compaction Grouting to itigate Liquefaction Potential Structural Recommendation Reduce Performance Objective, Limited Retrofit City of 'Tukwila Concept Level Seismic Upgrades - Community Center Seisrnic Improvements Program August 2008 2- Story, Pre Manufactured Metal Framing, Steel 18,500 SF, 1965 Construction o Legitim to Lo gitudinal LF S eak Mome t Frames Inadequate iap ragm Capacity Discontinuous Load Path Liquefaction Potential City of Tukwila Seismic Evaluation - George Long Shops Seismic Improvements Program August 2008 Reid iddleton Add Steel Moment Frames Longitudinally Strengthen Existing Steel Columns dd aso ry Shear a is Improve Existin• Column t Foundation Connections Expand Existing Foundations Impr ve Roof Diaphragm c,•nnections Compaction Grouting to Mitigate Liquefaction Potential Structural Recommendation Replace Structure IIV City of Tukwila George Long Shops Seismic Improvements Program August 2008 Staff Total Recommen Backnp Facility Action Cost of Needed 'Facility generator Costs P% �V�• lity r. y,,. 1. u�a+ w..: rl.e."u•"'"�..,w..l:".:ww^-:.�. Seismic a pVC7Y4CT acku Imp Upgrade Facility Consultant Seismic Cost $8,722,000 Year Seismic Fix Cost $380,0 Facility wilt Evaluation Recommendationt�> $4,690.400 gee 3 682,400 I tA) I I Retrofit $284,000 Replacement Failed $3 225,004 Sheet 197 $5,069,0 City Hall gee Replace Facility Retrofit Rep l ac e Facility Failed $180,000 Replacement 1978 $1 446,000 Sheet 6300 Sta 51 NIA Replace 5403,000 Upgrade/Replace Failed $128,004 Facility Fire Sta 51 1973 $,198,00 577,0 Retrofit Upgrade Facility ;Failed $141,000 $191,000 Fire Sta 52 1991 $50,00 'Upgrade/Rep I N/A, I NIA $908, acility< I 1 $387,000 $141,000 I 1995 Passed Fire Sta 53 $380,000 t�) See Replace Facility Retrofit ]'ailed $255,040 Replacement Fire Sta 54 1961 $1,308,000 Sheet $1,684,000 See Retrofit Rep Facility Nlinklcr Failed $150,000 Replacement 1 196 $2,178,000 Sheet Shops N/A Replace I U �erade Facilitytg) George Long 1965 .Fail 0Q I $374,000 Y $5,234,400 Shop $501,0 52,025,000 I s g rad to $4,363,000 xg,9 1 ,0 00 1 is cons idered to be critical to the City's Retrofit $15 225,000 3 Each building 52 0 Community Failed Occupancy performan 1995 poor if the Center performance for the Immediate Occup rades. etc. cxpeotcd structural p plumbing upgrades, electrical upgrades, etc. The cost-benefit ratio is extremely P 'Totals facility's age; Raid Middleton compliance, lighting upgrades, P post-earthquake in ADA comp lumbing u goaded; an d the facility. store 4 The 0 Build ng is r ecommen ded looked at the buil utg upgrading nee for Police e provide Recommendation i the Seismic Evaluatio nee windows, 21s. No room to expand no space VAC upgrades, radinB because of the extensive amount of improvements oily waste. (2) R aconeenandation esmade b include H down area For materials. Canter may be used Needed facility improvements replacement rather than uP8 study. t,r site drainage; out of compliance for handling y is rccvmely and for rap response time s NPDES requirement): insufficient lay G300 George Long ca pability s equipment: improper was chosen because the Community facility is J e upgraded, up space needs, location, esp nse time finds upon result of a is no V actor Waste to properly maintain the City' The Immediate Occupancy Final action d sic to, inadequate a capability the P s is severely under-sized, inadaq (6) Myerklur Shop is severely u ndersized; an d the facility• criteria rather than Immediate Occupancy. impounded ded v Shop N room to expand against the Lifc- Safety to be evaluated 8 the retrofit costs would be lower as a shelter It vehicles mass-care eCriteria were used, (8) Recommendation is for the facility as a shelter :and mass -oaro site. If the Life-Safety i Seismic Improvements Program Study Results