Bridge Design

GM2 Associates, Inc. provides a wealth of bridge design expertise, from simple span local bridges to major hybrid curved steel viaducts to timber design. Collectively, GM2 has seven full-time bridge engineers on staff, and all are licensed professional engineers. GM2's bridge design engineers have completed more than 1000 bridges over the spans of their careers, which highlights the in-depth technical and proven ability of this team.

Recent Bridge Engineering Experience:

• 21 Local Town Road Bridges over waterways, CT
• 3 Local Town Road Bridges over waterways, MA
• List 9 Bridges – (Rte 1, Rte 12, Rte 163), CT
• List 13 Bridge – MNRR over Rowayton Avenue, CT
• List 14 Bridge – I-84 in Tolland, CT
• List 14 Bridge – Howard Ave. over I-95, New Haven, CT
• List 14 Bridge – Rte 15 over the Mill River, Fairfield, CT
• List 15-18 Bridges – Rte 58 (2), Rte 37, Rte 110, CT
• I-95 and Ramp S-1 over Fulton Terrace, New Haven, CT
• Island Pond over I-293 and 93, Manchester, NH

Recent Examples of Work Include:

Route 7/15 Interchange, Structure No. 1 – Norwalk, CT
A 57 m, two-span continuous welded plate girder system. The project is under construction. Estimated construction cost of the bridge is $2,750,000.

I-95 over Route 1 West, Bridge No. 00134 – Stratford, CT
A 158-foot, single-span welded steel plate girder system with full-height cantilever-type reinforced concrete abutments and wingwalls. The project is designed for a three-stage construction. The design is 100% complete. Estimated construction cost is $5,300,000.

Burritt Street over I-84 – Southington, CT
A 73 m, two-span structure with 1800 mm deep New England Bulb Tees and a reinforced concrete deck made continuous for live loads. The substructure included full-height reinforced concrete abutments and bent-type center pier. The project was designed for two-stage construction. The bridge construction is complete. The construction cost was $3,400,000.

Route 2 West Viaduct over I-84 – East Hartford, CT
A 1,600-foot ramp structure consisting of 10 spans with curved and straight segments. The superstructure consists of twin box girders and a reinforced concrete deck. Piers are single circular concrete columns with cantilever cap. Construction is complete. Final cost of the bridge was $11,300,000. Personal experience of Madan Gupta, designed for Parsons Brinckerhoff. Click here for photos.

Route I-91 N.B. over Route 15 – Hartford, CT
A 430-foot, two-span continuous structure with welded plate girders. The bridge has a 65 degree skew. The substructure consists of full-height reinforced concrete abutments and round concrete columns supported on individual footings. Construction is complete. Final cost of the bridge was $6,600,000.

Route 7 over I-95 – Norwalk, CT
Deck and wearing surface replacement and rehabilitation of superstructure steel girders and concrete substructure on a 336-foot, two-span continuous bridge. Construction is complete. Construction cost was $3,750,000.

Route 1 over Mennunketesuck River – Westbrook, CT
An 82-foot, simple-span bridge with prestressed concrete box beams. Construction was completed in 2003. This was an assignment from ConnDOT under the Bridge Rehabilitation Program, List 9. Construction cost of the project was $3,300,000.

Metro-North Railroad over Rowayton Avenue – Norwalk, CT
A 55-foot span bridge with concrete-encased welded steel plate girders fabricated in 3-foot wide sections. The bridge is supported on drilled concrete filled steel piles. Project is designed for a four-stage construction to replace one track at a time. The project is presently under construction with an estimated bridge cost of $3,800,000.

Island Pond Road Bridge over I-93 & I-293 – Manchester, NH
Two 136-foot single span bridges. The superstructure consists of steel plate girders of 50 ksi yield strength composite with a reinforced concrete deck on prestressed precast concrete deck panels. The substructure consists of full height abutments and wingwalls. The project is under design. Anticipated construction is two years. Estimated construction cost is $7,000,000.

The Pearl Harbor Memorial Bridge – New Haven, CT
This project involved building 3-D finite element models for multi-modal analysis of multi-span bridges, nonlinear push-over analysis, and plastic hinge detailing. The viaduct consists of eleven proposed bridges, and a temporary crossover bridge that is used during staged construction of the viaduct. The substructures include multi-column reinforced concrete bents and straddle bents supported on precast pile foundations, and multi-column bents on drilled shafts. Certain span lengths of the cap beams are up to 40 meters between columns. The seismic results were used to design the cross-frames of the curved superstructure, bearings, piers, and the foundations. The foundations were designed using the seismic forces and soil structure-interaction stiffness calculated from a non-linear finite element program. The seismic models were also modified to determine the thermal movements. The FEM computer codes that the firm uses for such work are GT Strudl, STAAD, and LARSA 2000. Additionally, a flood plain analysis for the proposed new Q-Bridge structure was performed using the program HEC-RAS. In conjunction with this effort, GM2 was responsible for the demolition sequence of the entire existing structure and the design of two single-span bridges over Fulton Terrace. Both bridges utilize steel plate girders and are part of contract B of the corridor improvements. Click here for photos.

Old Forge Road Bridge – Colebrook, CT
Honorable Mention at the Connecticut Engineers in Private Practice 1997 Awards Ceremony. Prestresed box beams, precast architectural arch, granite curbing, and cap stones. 85-foot span over trout-stocked Sandy Brook in a pristine country setting. Dangerous Y-intersection and steep grades were replaced with a T-intersection and gentle grade. 600-foot roadway reconstruction. Click here for photos.

Fabyan-Woodstock Road Bridge – Thompson, CT
Project involved curved 80-foot prestressed concrete deck units, one new abutment at the west approach, and widening of the existing east abutment, plus total horizontal and vertical realignment of approaches. Click here for photos.

McClave Hill Road – Colebrook, CT
Bridge features a recast, reinforced concrete rigid frame with new Cast-In-Place reinforced concrete wingwalls. McClave Hill Road provides access to the popular YMCA "Camp Jewell." A new sidewalk for fishing access was included. The GM2 design minimized impact to the waterway and the Inspection team closely monitored compliance to all permits. The bridge was opened in the Spring of 2001, on schedule and budget. Click here for photos.

Beech Hill Road – Colebrook, CT
42-foot prestressed concrete deck units, one new RCC abutment at the west approach, widening of existing east abutment, and total horizontal and vertical realignment of approaches. GM2 was responsible for the initial bridge safety inspection, application process, design, and construction inspection of this bridge. Click here for photos.

Stone Mill Road Bridge – Mansfield, CT
GM2 is designing a replacement structure for the existing two-span Stone Mill Bridge. The bridge site, located approximately 35 feet from the historic Grist Mill Building, makes aesthetics an important consideration for the new bridge. Pending final approval from the town, the replacement structure will consist of a two-span concrete arch with a stone masonry facing to compliment the historic surroundings. Click here for photos.