Newton, MA
1210-1230 Washington Street Garage
Scope/Solutions
The 1210-30 Washington Street Garage is a three-level reinforced concrete parking structure with approximately 25,000 sq ft per level. The two-way slabs are supported by interior concrete columns with capitals and exterior concrete masonry bearing walls. The garage exhibited excessive deflections of the elevated decks at bay midspans, and extensive concrete cracking and concrete spalling. The owners retained SGH to perform a comprehensive survey and investigation involving structural analysis, load testing, remedial CFRP-strengthening design, and construction administration during repairs.
Highlights of SGH’s work for this project include the following:
- Used ground penetrating radar (GPR) testing to determine the location of top and bottom reinforcement in the slabs
- Performed a structural analysis of slabs based on as-built conditions to identify structural deficiencies
- Determined that several negative-moment slab regions were deficient to support the code-prescribed design loads
- Performed cyclic load testing to demonstrate that the as-built garage had sufficient strength (ACI-440 “threshold” strength) to qualify for strengthening with a carbon fiber-reinforced polymer (CFRP) system
- Developed a rehabilitation program, including repair of deteriorated concrete, addition of deck waterproofing and drains, and strengthening of concrete slabs with near-surface-mounted (NSM) CFRP bars
- Conducted construction monitoring during rehabilitation
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Project Summary
2006
Completion Date
AWARD
Winner
Solutions
Repair & Rehabilitation
Services
Structures | Applied Science & Research
Markets
Commercial
Client(s)
Hinckley, Allen & Snyder
Specialized Capabilities
Repair & Strengthening | Physical Testing
Key team members
Additional Projects
Northeast
One Cambridge Place
The project, which would provide CDM with parking for 235 cars and 160,000 sq ft of office space, needed a compressed design and construction schedule. SGH designed the new nine-story structure in time to obtain building permit sixty days after the initiation of design.
Northeast
Dow Jones & Company
The administration building (Building #4) at the campus of Dow Jones & Company was erected between 1979 and 1981. Shortly after construction, occupants observed water leakage at the walls. SGH investigated the leakage and developed a remedial plan for the office building.