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
1 of 5
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
Blue Cross Blue Shield of Massachusetts, South Shore Headquarters
The new South Shore Headquarters for Blue Cross Blue Shield of Massachusetts (BCBSMA) balances function, sustainability, and architectural aesthetics with budget. SGH consulted on the building enclosure design and provided building science services for the new four-story, 333,000 sq ft building.
Northeast
99 Summer Street Parking Garage
The parking garage, constructed with concrete slabs on metal deck supported by steel beams and columns, includes two below-grade levels under a twenty-story office building. SGH performed a condition assessment and designed repairs to extend the useful life of the parking structure.