|
| |
|
Structural Engineering 
|
|
Gibson-Thomas
Engineering Co., Inc. has been providing structural engineering
services to various municipalities for over 50 years.
From buildings, retaining walls, to culverts and parking
facilities, Gibson-Thomas Engineering Co., Inc. maintains and designs the
reconstruction of these vital pieces of the boroughs and cities we
consult. In addition to these
types of structures, our firm performs design for bridges and highways. Working in conjunction with the Pennsylvania Department of
Transportation, the Turnpike Commission, and the local entities
Gibson-Thomas Engineering Co., Inc. provides the following services. |
Services
Highways
Expressways
Ramps/Interchanges
Arterials/Streets
Bridge
/ Structures
Single and
Multi-Span Bridges
Reinforced
Concrete Culverts
Bridge
Rehabilitation/Reconstruction
Wood
Structures
NBIS
Bridge Inspections
Retaining
Walls
Viaducts
Traffic/Parking
Transit
Bus Maintenance Facilities
|
 |
|
Project:
Project
Description: |
Indiana County Commissioners
Thomas
Covered Bridge
This challenging project was the total
rehabilitation of an historic covered
bridge in Armstrong Township, Indiana County.
The wooden Town Lattice Truss was modeled and analyzed using the
latest computer technology to determine its capacity for carrying its own
dead load as well as AASHTO wind loads and BOCA snow loads.
The existing floorbeam and lateral bracing system was replaced with
steel beams and diaphragms; including PTFE coated stainless steel plates
attached at the interface of the truss bottom chord and the diaphragms to
allow vertical and horizontal translation while providing lateral/tor sional
stability. The structural
decking became glued-laminated panels with longitudinal deck planks to
maintain the historic appearance, with a special deck clip design to
ensure that the deck would act as a diaphragm for the lattice members.
Finally, the coordination between the Pennsylvania Department of
Transportation, the Pennsylvania Department of Environmental Protection
and the Pennsylvania Historical and Museum Commission was the most
outstanding achievement. Maintaining
each entity's standards was impossible, however, the need for the design
exceptions did not stop the project from being completely designed and
approved on schedule. Construction was completed August 1998.
|
|
|
|
|
