Bedford By-pass Girder Repair
Location: Dartmouth, NS
Client: Cherubini Metal Works
Duration: 2016
Key Staff: Sarah Hardy, Calvin MacAulay
Project Description
The Bedford By-Pass Bridge Structure was constructed in 1976 in Dartmouth, Nova Scotia. The 3 span structure consists of 8 1065 mm deep steel plate girders with a 215 mm thick reinforced composite concrete deck. The three span structure has side spans of 15.5m with a main span of 34.350 m which spans over Highway 102. The superstructure is supported on reinforced concrete piers and abutments all of which are founded on spread footings.
In 2012, the Bedford By-Pass Bridge Structure sustained structural damage from a vehicular impact to the north girder bottom flange above the south bound lanes of Highway 102. In 2016, NSTIR awarded the contract for rehabilitation of the Bedford By-Pass Bridge Structure to Cherubini Metal Works. Cherubini Metal Works contracted Harbourside to provide structural engineering services for the rehabilitation of the portion of the Bedford By-Pass Bridge superstructure that sustained impact damage.
Harbourside’s Role
Harbourside completed a condition assessment of the damaged girder which entailed a detailed visual inspection followed by a detailed structural analysis of the current deformed girder geometry using three-dimensional finite element models to ensure the damage girder was adequate during in-service conditions.
HEC developed a girder repair procedure that didn’t require replacement of the girder or propping of the damaged girder, thus minimizing impact to traffic on Highway 102 below and the Bedford By-Pass above.
HEC provided detailed phasing drawings outlining the girder repair procedure to the contractor, in addition to providing the contractor with on-site services to ensure the girder repairs were being completed as per the repair phasing procedure and provide immediate assistance when necessary.
Unique Challenges
As one of the most congested cities in North America, the Halifax Regional Municipality cannot afford major delays. The unique construction methods used to repair the Bedford by-pass girder were innovative, and crucial in mitigating traffic disruptions.
Social Impact
The repairs to the Bedford by-pass represent an ongoing dedication to safety for motorists. This project also ensures the structural integrity of the Bedford by-pass, and that traffic can flow a little more easily.
