Evaluation Services
Evaluation of structures using advanced analytical capabilities has been a core part of OPAC's engineering services since the inception of the firm. Our expertise centers in two areas: Dynamic Analysis and Time-dependent Analysis.
OPAC's dynamic analysis experience includes studies of seismic vulnerability, fatigue effects, aerodynamic performance, and dynamic impact response to high-speed rail loads. Our dynamic analysis capabilities can incorporate nonlinear inelastic characterizations of soil, foundations, cables, concrete, and steel components.
OPAC can provide time-dependent analysis for complete stage-by-stage evaluations of stresses, strains, and deflections for structures.
OPAC has successfully provided evaluation services to our clients on some of the largest and most important transportation structures in North America, Asia, and South America:
OPAC offers the following evaluation services:
| Advanced Structural Analysis: | Evaluation of Structures/Bridges: | |
| Time-history analysis | Precast segmental bridge | |
| Soil-structure interaction analysis | Cast-in-place segmental bridge | |
| Nonlinear dynamic analysis | Concrete girder bridge | |
| Inelastic analysis | Cable-stayed bridge | |
| Seismic evaluation | Suspension bridge | |
| Wind engineering | Steel box girder bridge | |
| Rolling stock analysis | Arch | |
| Time-dependent analysis | Concrete dome | |
| Collapse analysis | Pedestrian bridge |
Selected OPAC Evaluation Projects: (31 Total, 5 on this page)
PG&E L-400 Bridge - Evaluation and Retrofit Design
Structural evaluation and retrofit design of a cable-supported pipeline bridge.
Tehama-Colusa Canal near Tyler Road, Red Bluff, California. Evaluation and retrofit design completion 2018
Memorial Causeway Bridge - Engineering Investigation
Engineering investigation of a segmental bridge that consists of a nine-span 2,340 ft long concrete girder.
Clearwater, Florida. Investigation completed 2009
Ringling Causeway Bridge - Engineering Investigation
Engineering investigation of a segmental bridge having structural issues during construction.
Sarasota, Florida. Investigation completed 2009
Tappan Zee Bridge - Peer Review
Performed peer review of a cantilever truss bridge with a main span of 1,212 feet which was constructed across the Hudson River in New York.
Tarrytown - Nyack, New York. Peer review completed 2008
Manhattan Bridge - Value Analysis
Value analysis for seismic assessment and retrofit of a historic suspension bridge.
Brooklyn-Manhattan, New York. Value analysis completed 2007