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Home My WebLink AboutCOW 2022-02-28 Item 4C - Update - Safe Reopening Plan for 42nd Avenue South BridgeCOUNCIL AGENDA SYNOPSIS ,�v)* ;_ 4s, Initials ITEM No. O(4.-i`� Meeting Date Prepared by Mayor's review Council review 02/28/2022 BR 4.C. NC\03 \\,....n 1908 ITEM INFORMATION STAFF SPONSOR: ADAM COX ORIGINAL AGENDA DATE: 2/28/22 AGENDA ITEM TITLE 42nd Ave S Bridge Safe Reopening Plans CATEGORY 11 Mtg Discussion Date 02/28/22 ❑ Motion Meg Date ❑ Resolution Mtg Date ❑ Ordinance M. Date ❑ Bid Award Mtg Date ❑ Public Hearing Mtg Date ❑ Other Mtg Date SPONSOR ❑ Council ❑ Mayor ❑ Admin Svcs ❑ DCD ❑ Finance ❑ Fire ❑ PeER ❑ Police ❑ PIF SPONSOR'S The 42nd Avenue South Bridge was damaged by an over height semi -truck on 12/15/21. SUMMARY The bridge was closed to traffic until repairs and further analysis could be completed. The City contracted with Flame On, Inc. to repair the damages. After post -repair structural analysis and non-destructive testing, and reviewing the options of one-way versus two- way traffic, the consensus among the bridge engineers, consultants and inspectors is to safely re -open the 42nd Ave S Bridge to one lane traffic. REVIEWED BY ❑ Trans&Infrastructure Svcs ❑ Community Svcs/Safety ❑ Finance & Governance ❑ Planning & Community Dev. ❑ LTAC ❑ Arts Comm. ❑ Parks Comm. ❑ Planning Comm. DATE: COMMITTEE CHAIR: RECOMMENDATIONS: SPONsoR/ADMIN. Department of Public Works COMMITTEE COST IMPACT / FUND SOURCE EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED $ $ Fund Source: 104 Comments: MTG. DATE RECORD OF COUNCIL ACTION 02/28/22 Committee of the Whole MTG. DATE ATTACHMENTS 02/28/22 Informational Memorandum dated 02/25/22 42nd Ave S Bridge Reopening Slide Deck Post Damage Assessment Memo 21 22 TO: FROM: BY: DATE: SUBJECT: City of Tukwila Allan Ekberg, Mayor Public Works Department - Hari Ponnekanti, Director/City Engineer INFORMATIONAL MEMORANDUM City Council Hari Ponnekanti, P.E, Public Works Director/ City Engineer Adam Cox, Transportation Project Manager February 25, 2022 42nd Ave S Bridge Impact — Safe Reopening Plans ISSUE Discuss the plans to safely reopen the 42nd Ave S Bridge to one-way traffic by early March. BACKGROUND On Wednesday, December 15, 2021, an over height truck was traveling northbound on the 42nd Ave S Bridge and struck one sway frame of the bridge, inflicting critical damages to the mentioned sway frame and its associated vertical elements of the through -trusses of the bridge. It appeared no member of the truss bridge was separated nor sheared off and the damages were limited to the one mentioned sway frame area. The bridge was immediately closed until the inspection team, provided by King County, could perform the critical finding inspection in coordination with the structural analysis team, TranTech Engineering, LLC. Both King County and TranTech are well -versed on the 42nd Ave. S. Bridge and its history. The inspection team, with assistance of City staff and equipment, was able to complete the inspection on December 16, 2021 by approximately 12:45 pm. The recommendation from King County Inspectors was to keep the bridge closed to all traffic while further analysis was being performed, please refer to the attached Post Damage Assessment Memo. A local steel strengthening contactor (Flame On, Inc.) was available for a site visit on Friday, December 17, 2021 to assess the damage and the possibility of repair. Given the photographs from the inspection and their heat strengthening experience, the contractor was confident that the steel members could be bent back in place. Because of the type of bridge strike at issue, it was determined that the bridge could be safely repaired. King County inspectors, TranTech structural engineers, and City engineers all agreed with this direction. The City issued a notice to proceed to Flame on, Inc on December 21, 2021. Flame On performed repairs around the holidays as weather permitted and completed repair work on Tuesday, December 28, 2021. To verify the repairs by Flame On, King County inspectors performed an inspection of the work, and TranTech performed a non-destructive test and structural analysis of the compromised area to verify the strength of the compromised steel and determine if further restrictions are necessary for the bridge. The composition of the bridge structure and the methods of construction in the 1940's make the gusset plates inaccessible, resulting in various unknowns. In addition to these various unknowns and the shearing in the rivets because of the bridge strike damages, TranTech recommends further weight restrictions be imposed to safely re -open the bridge either by reducing the traffic to one-way or further weight restrictions to two-way traffic. The Sufficiency Rating (SR) is likely to decrease further. More details will be provided in the finalized inspection report. 23 HISTORICAL TIMELINE 12/15/21 Over Height Truck struck 42nd Ave S Bridge sway frame 12/16/21 King County inspectors and TranTech engineering inspect bridge and damages 12/17/21 Flame On onsite to inspect damages and determined repairs feasible 12/21/21 Mayor signs State of Emergency Proclamation 12/21/21 Contract between City and Flame On signed 12/21/21 Flame On begins repair work 12/28/21 Flame On finishes repair work 1/3/22 Non-destructive testing completed 1/5/22 King County post -repair inspection of the bridge 1/10/22 Update and discussion at Committee of the Whole meeting 1/25/22 Update and discussion at Allentown Community meeting 2/28/22 Update and discussion at Committee of the Whole meeting 3/7/22 Update on traffic direction at the Council meeting April 2022 Planned reopening to one-way traffic ANALYSIS After reviewing the options of one-way or two-way traffic, the consensus among the bridge engineers, consultants and inspectors is to safely re -open the 42nd Ave S Bridge to one lane traffic to reduce the loading of the structure and extend the life of the structure until a replacement is planned for in 2025. The structure would maintain the 15 -mph speed limit for trucks and the previous weight restrictions on all truck configurations. The bridge can be configured to only allow traffic to travel one-way across the structure. At the February 22, 2022, City staff received input from the Allentown community that the direction of traffic across the 42nd Ave S Bridge to go north. City staff are evaluating and conducting further research to determine the direction of the one-way traffic flow. FINANCIAL IMPACT No financial impact at this time; however, traffic control plans, traffic analysis, and signage will be required. It is estimated that the installation of the traffic control will take one week; however, roadway striping is weather dependent, and it is currently the rainy season. RECOMMENDATION Information Only: The plan is to safely re -opening of the 42nd Ave S bridge to one lane. The attached recommendation from the structural engineer recommends the direction of traffic to be southbound. ATTACHMENTS: 42nd Ave S Bridge Slide Deck Post Damage Assessment Memo Phone: 206-433-1800 • Email: Mayor@TukwilaWA.gov • Website: TukwilaWA.gov 24 City of Tukwila Safe Reopening Plans for 42nd Ave S Bridge after Bridge Strike 1 d !A•` f r rl 4 nr �rf ,■r. i i 1 Ori ern 6 Pre and Post Damage Repair Photos King County Inspection Following Damage 2 City of Tukwila 142nd Ave S Bridge Repair Post Repair Photo of the Damaged Area Pre and Post Damage Repair Photos Damaged Sway Brace 3 City of Tukwila 142nd Ave S Bridge Repair Sway Brace Following Repair Gusset Plate • The critical member that was compromised by the impact is the lower gusset plate on the east truss. • Access to the gusset plate is limited due to the pedestrian walkway and the structural members. • A non-destructive test (NDT) was performed at the gusset plate after Flame On completed the repairs to get a better understanding of the internal composition of the steel. • No cracking in the steel was observed with the NDT however, there is no way to know if the steel rivets have been compromised. • Given the unknowns of the rivets, additional weight restrictions for the bridge are advised. 4 City of Tukwila 142nd Ave S Bridge Repair Vertical member and gusset plate One Way Reopening Safe Reopening of the 42nd Ave S Bridge Opening the bridge with one lane and no additional weight restrictions is the best, safe reopening plan because: - Structural Engineering Consultant recommendations, King County bridge inspection reports, and sufficiency rating calculations will be available to be shared when WSDOT releasees the inspection report. - No weight limiting enforcement of bridge traffic would be needed. 5 City of Tukwila 142nd Ave S Bridge Repair W 0 One Way Reopening Safe Reopening of the 42nd Ave S Bridge Opening the bridge with one lane and no additional weight restrictions is the best, safe reopening plan because: - Meets the additional restrictions by cutting the loads in half by only having one lane - This reduces the dynamic loading on the structure - Would require the least number of resources and expenses for enforcement - One lane traffic would proceed across a marked middle area of the bridge deck 6 City of Tukwila 142nd Ave S Bridge Repair One Way Reopening Safe Reopening of the 42nd Ave S Bridge Recommendation to open the bridge with one lane and no additional weight restrictions is supported by the WSDOT local Bridge Engineer, King County Inspectors, TranTech Engineering and City staff: - Meets the additional restrictions by cutting the loads in half by only having one lane - This reduces the dynamic loading on the structure - Would require the least number of resources and expenses for enforcement. 7 City of Tukwila 142nd Ave S Bridge Repair 32 TRANTECH Engineering LLC STRUCTURAL MEMO Date: February 1, 2022 To: Adam Cox, PE — City of Tukwila Public Works Department From: Kash Nikzad Re: 42"d Ave S Bridge — Post Critical Damage Repair Assessment Memo City of Tukwila's (City) 42nd Ave S Bridge was subject to a high impact load from a truck on Wednesday 12/15. The truck struck the first sway frame of the bridge from the south side and inflicted some critical damages to the mentioned sway frame and its associated vertical elements of the through - trusses of the bridge. The bridge was closed shortly after this incidence by City Police Depailinent and on Thursday 12/16, the King County inspection crew performed an in-depth inspection of the damaged areas. A Structural Memo dated 12/17/21 provided details of the incidence and the emergency closure and inspection of the bridge; please see Attachment 1. Following the impact damage incidence, The City quickly secured the services of a heat straightening company, Flame On, to provide repairs to the compromised truss elements. These activities were performed from 12/21 through 12/28. Please see Attachment 2 for some post damage repair photos. Following these repairs, some Nondestructive Testing (NDT) with Magnetic Particle Testing (MPT) was performed on the gusset plates that connect the compromised sway frame to the tension bottom chord of the bridge trusses. Furthermore, the King County inspection crew performed a follow-up post repair inspection on 1/5/22. The results of the post -repair inspections were mostly pointing in the direction that the damages were repaired with the caveat of the unknown hidden damages that might be located in hard -to -reach locations. With information at hand, TranTech's structural team performed a post damage inspection report, and the results show that the post -repair load rating factors for legal trucks are lower than prior load rating of the bridge that was performed in 2019. The gusset plate on the lower chord of the trusses that involve the impacted sway frame was and remains the critical load rating element for the whole bridge structure. In consultation with the City, the structural team also performed load rating for a condition that the bridge only carries a one-way south -bound traffic. A comparison load rating factor summary table for pre -damage, two-lane and one -lane traffic scenarios is provided in Attachment 3. As seen, the two-lane conditions now have lower load rating factors than the pre -damage conditions. Based on the load rating results, King County inspection team have updated the bridge inspection data. The new inspection report is provided in Attachment 4. As seen, the Sufficiency Rating (SR) of the bridge is now at 6.00. TranTech Engineering, LLC 365 —118"' Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 33 At the request of the City, the design team performed a constructibility and cost analysis for the replacement of the critical gusset plate. The task involves a potentially lengthy permitting activity as it requires temporary work trestle piles in the river, and relocation of gas and water pipelines. Based on the information at hand, possibility of some remaining hidden damages due to impact, and the challenges for enforcing weight limitations on the bridge, TranTech recommends that the City considers the implementation of a one-way southbound traffic on the bridge to go with the current weight limitations on it. This will provide some factor of safety for any possible hidden damages. Should you have questions, please call me at 425-894-8937 or email me at knikzad@trantecheng.com Sincerely, Kash Nikzad, Ph.D., PE Senior Structural engineer TranTech Engineering, LLC Attachments: 1. Critical Damage Report Memo Dated 12-17-21 2. Post Damage Repair Photos 3. Post Damage Repair Load Rating Summary Sheets 4. Draft King County Post Damage Repair Inspection Report (separate attachement) TranTech Engineering, LLC 365 —118' Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 34 Attachment 1 - Critical Damage Report Memo Dated 12-17-21 TranTech Engineering, LLC 365 —118' Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 35 Id TRANTECH Engineering LLC STRUCTURAL MEMO Date: December 17, 2021 To: Adam Cox, PE — City of Tukwila Public Works Department From: Kash Nikzad Re: 42nd Ave S Bridge Critical Damage City of Tukwila's (City) 42nd Ave S Bridge was subject to a high impact load from a truck on Wednesday 12/15. The truck struck one sway frame of the bridge and inflicted some critical damages to the mentioned sway frame and its associated vertical elements of the through -trusses of the bridge. The bridge was closed shortly after this incidence by City Police Department and on Thursday 12/16, the King County inspection crew performed an in-depth inspection of the damaged areas. Attached please find the preliminary Critical Damage Report from the County and some inspection photos. From observations made by TranTech, it appears that no member of the truss bridge has been separated and sheared off and the damages are limited to the one mentioned sway frame area. On Friday 12/17, the City and TranTech team met a heat straightening contractor, Flame On Inc., at the site and it was determined that this repair is feasible and effective for repair of the observed damages. TranTech recommends that the City obtains the services of this contractor for repair of the described sway frame damages. Should you have questions, please call me at 425-894-8937 or email me at knikzad@trantecheng.com Sincerely, Kash Nikzad, Ph.D., PE Senior Structural engineer TranTech Engineering, LLC Attachments: Critical Damage Report and Inspection Photos TranTech Engineering, LLC 365 —118th Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 36 Critical Damage Report and Inspection Photos TranTech Engineering, LLC 365 — 118`" Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 37 Washi ton State jrDepartment of Transportation Critical Damage Bridge Repair Report Agency Name King County DLS Bridge Name 42nd Ave South Bridge Structure Identifier 08109700 Bridge Number TUKxNx14 Bridge Location 0.1 mile N of Interurban Ave S on 42nd Ave S Inspector's Initials MAG Inspector's ID Number G1103 Inspection Date December 16, 2021 Describe Deficiency The 42nd Ave South Bridge was closed Wednesday afternoon 12-15-2021 due to a high load strike. At impact the load was torn from the truck and landed on the deck. The 42nd Ave Bridge is a Riveted Steel Thru Truss. The truss is skewed at 38°. The high load impact struck the upper lateral bracing between vertical members WU1-LI and EU2-L2 above the north bound lane near the east truss. At the impact point the lateral bracing is buckled and out of plane up to 18", the south flange has sine wave crimps. The west vertical WU1-LI is buckled just below the lateral connection. The SE angle flange at the buckle is bent over the rivets for 18" where the load flipped off the trailer and impacted the vertical. The east vertical EU2-L1 is buckled 5' above the deck and out of plane approx. 10". It is also buckled at the WU2 gusset connections on the north flange and just above the gusset WL2 north flange. The Fracture Critical Plan indicates WU 1-L 1 as a tension member and EU2-L2 as neutral. Describe Recommended Repair Recommend Structural Analysis. The bridge is to remain closed for further analysis. Date Work To Be Finished By Submitted By Date Submitted Margaret Germeaux 12/16/2021 Describe Work Done Date Work Finished Submitted By cite DOT Form 14C-151 EF Revsed 11.'2001 38 TranTech Engineering, LLC 365 —118' Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 39 40 Attachment 2 - Post Damage Repair Photos TranTech Engineering, LLC 365 —118' Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 41 , -=-- Sway Frame Following Repair TranTech Engineering, LLC 365 —118' Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 42 Attachment 3 - Post Damage Repair Load Rating Summary Sheets TranTech Engineering, LLC 365 — 118`" Ave SE, Suite 100, Bellevue, WA 98005 425-453-5545. Fax: 425-453-6779 43 42nd Ave S Bridge Load Rating Results Vehicle Pre -damage Rating Post -damage & Repair Rating - Two Lanes Post -damage & Repair Rating - One Lane AASHTO 1 (Type 3) 1.21 0.96 1.46 AASHTO 2 (Type 3S2) 0.90 0.72 1.09 AASHTO 3 (Type 3-3) 0.84 0.67 1.01 NRL 0.73 0.59 0.89 SU4 1.11 0.89 1.35 SU5 0.98 0.78 1.18 SU6 0.88 0.71 1.07 SU7 0.81 0.64 0.98 EV2 0.62 0.62 0.94 EV3 0.42 0.42 0.63 OL1 0.75 0.53 0.81 OL2 0.40 0.28 0.43 BRIDGE RATING SUMMARY Bridge Name: 42ND AVENUE SOUTH BR Bridge Number: TUKWILA-14 Span Types: Steel Through Truss Bridge & Approach Slabs Bridge Length: 280' (220' Truss + 2x30' Approach Slab) Design Load: HS20-44 Rated By: VP Checked By: KN Date: 1/27/2022 EXPIRES 5/18/2?' Inspection Report Date 4/26/2017 Substructure Condition 4 Rating Method LFR Deck Condition 6 Overlay Thickness 0"/Truss & 2"/Approach Superstructure Condition 5 Truck RF (INV) RF (OPR) Controlling Point AASHTO-1 AASHTO-2 AASHTO-3 NRL OL -1 OL -2 NBI Rating 0.58 0.43 0.40 0.35 0.32 0.17 0.96 0.72 0.67 0.59 0.53 0.28 RF Ton Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Controlling Point Inventory (HS -20) Operating (HS -20) Operating Rating 0.31 11 0.52 19 RF Ton SU4 (GVW = 54 K) SU5 (GVW = 62 K) SU6 (GVW = 69.5 K) SU7 (GVW = 77.5 K) EV2 (GVW = 57.5 K) EV3 (GVW = 86.0 K) Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Controlling Point 0.89 24 0.78 24 0.71 25 0.64 25 0.62 18 0.42 18 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Remarks: Bridge got impact damage on 12/16/21 and got repaired by heat straightening in early January 2022. Bridge requires posting for all legal trucks 45 BRIDGE RATING SUMMARY Temporary 1 -Lane South -bound Travel Condition Bridge Name: 42ND AVENUE SOUTH BR Bridge Number: TUKWILA-14 Span Types: Steel Through Truss Bridge & Approach Slabs Bridge Length: 280' (220' Truss + 2x30' Approach Slab) Design Load: HS20-44 Rated By: VP Checked By: KN Date: 1/27/2022 EXPIRES 5/18/ ,. Inspection Report Date 4/26/2017 Substructure Condition 4 Rating Method LFR Deck Condition 6 Overlay Thickness 0"/Truss & 2"/Approach Superstructure Condition 5 Truck RF (INV) RF (OPR) Controlling Point AASHTO-1 AASHTO-2 AASHTO-3 NRL OL -1 OL -2 NBI Rating 0.87 0.65 0.61 0.53 0.49 0.26 1.46 1.09 1.01 0.89 0.81 0.43 RF Ton Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Controlling Point Inventory (HS -20) 0.47 17 Operating (HS -20) 0.79 28 Operating Rating RF Ton SU4 (GVW = 54 K) SU5 (GVW = 62 K) SU6 (GVW = 69.5 K) SU7 (GVW = 77.5 K) EV2 (GVW = 57.5 K) EV3 (GVW = 86.0 K) Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Controlling Point 1.35 36 1.18 37 1.07 37 0.98 38 0.94 27 0.63 27 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Gusset Plate, Yielding in member L2U1 Remarks: Bridge got impact damage on 12/16/21 and got repaired by heat straightening in early January 2022. This load rating pertains to temporary one lane south -bound condition. Bridge reuires posting for SU7 46