Opac Consulting Engineers
Call now
Call now
Website
Call
OPAC is a San Francisco based engineering firm founded in 1992 by a group of experienced and enthusiastic engineers who have worked together since the late 1970s. Since then, we have successfully addressed many engineering challenges around the world. Our goal is to provide sound engineering technology and judgment toward the design and construction of bridges and other structural systems.

Whether you are an owner looking for design or evaluation of structural system, a contractor looking for construction engineering support, or a design professional looking for design or engineering support, look to OPAC. The mainstay of our practice is bridge engineering, and the firm has made significant contributions in that field. We have provided design services on suspension bridges, cable-stayed bridges, arch bridges, segmental girders, complex interchanges, and other structures such as concrete shell domes.

We have evaluated bridges for constructability, seismic performance, and wind and collapse assessment.
Highlights

read more › OPAC takes great pride in providing high quality, well-managed, cost effective, and timely professional engineering services to our clients. We have successfully completed projects in the United States, Canada, Central America, South America, and various countries of the Pacific Rim. We are committed to excellence and innovation in our worldwide consulting engineering services. Our goal is to be responsive and service-oriented, and to provide our clients with the best possible solutions for each project.

read more › OPAC has a broad portfolio of completed bridge and structural engineering projects. Some of our projects - across all structure and service types - are listed below. Use the Projects submenus above to browse more complete listings of projects by structure type. Structural design and construction support for BART traction power facilities replacement projects. Design of a girder bridge or an arch bridge to replace an existing arch bridge in rural Sonoma County. Design of a concrete arch bridge to replace the existing truss bridge in rural Sonoma, California.

read more › OPAC's work on segmental bridges included design, design review, construction review, construction engineering, engineering investigation and collapse investigation. Our principals have contributed in some of the earliest segmental bridge designs in the United States. Peer review and independent design check of a multiple levels freeway interchange built by segmental method. Construction engineering for a 1,090 ft concrete arch bridge downstream of the Hoover Dam. Engineering investigation of a segmental bridge that consists of a nine-span 2,340 ft long concrete girder.

read more › OPAC's work on arch bridges included design, design review, construction review, construction support and seismic evaluation. Our principals have contributed creative design solution in some unique arch bridge projects prior to OPAC. Design of a concrete arch bridge to replace the existing truss bridge in rural Sonoma, California. Design and construction support for an asymmetrical arch bridge in rural Sonoma, California. Construction engineering for a concrete arch bridge across Smith River near Del Norte, California.

read more › OPAC's work on cable-supported bridges included design, design review, construction engineering, seismic evaluation and engineering investigation. We designed the longest span new suspension bridge in the United States in over 35 years when it was completed. Our principals have worked on design and construction engineering on a few cable-stayed bridges prior to OPAC. One of our principal directed the precedent-setting seismic evaluation and retrofit strategy studies of the Golden Gate Bridge in the late 1970's.

read more › OPAC has successfully provided engineering services for transit stations, transit guideway structures and high speed rail structures to our clients. These services include design, seismic evaluation and retrofit design. Structural design and construction support for BART traction power facilities replacement projects. Design of 3 overhead bridges that carry local roads across high speed rail tracks in Madera County and design of a 4000 ft. Structural design and construction of a 2-story office structure for the Central Warehouse replacement project at BART Hayward Maintenance Complex.

read more › OPAC prepared the structural design and bid plans of three stations for the Bay Area Rapid Transit District-San Francisco Airport Extension. Our principals have also worked on some transit station projects prior to OPAC. Structural design and construction support for BART traction power facilities replacement projects. Structural design and construction of a 2-story office structure for the Central Warehouse replacement project at BART Hayward Maintenance Complex.

read more › OPAC's work on transit guideway structures included design, design study, construction review, construction support, seismic evaluation and retrofit design. Our principals have also worked on some transit guideway projects prior to OPAC. Design of 3 overhead bridges that carry local roads across high speed rail tracks in Madera County and design of a 4000 ft. Design of an elevated guideway for automated transit system at the San Francisco International Airport. Development of an optimized structural concept for use in building 263 km of elevated high speed rail structures with typical span lengths of 25 to 30 meters.

read more › OPAC has a broad portfolio of completed bridge and structural engineering projects. Listed below are a few of our signature projects for which we have written longer Feature Articles. Use the submenus above to browse more complete listings of projects by structure type. A 90 m span arch bridge for pedestrians across the freeway in Berkeley. The steel arch ribs consist of curved inclined steel pipes in a basket handle configuration. A 300 m span steel arch bridge across the Yong River. The arch ribs are steel box sections and the deck consists of steel box girder with orthotropic deck.

read more › OPAC's creative approach to engineering design and problem solving has provided the background for design of numerous unique or unusual structural systems for bridges, transit stations, industrial structures, and buildings. OPAC's designs are based on a commitment to rational forms, sound engineering judgements, quality aesthetic treatments, practical construction methods and the adoption of performance-based design principles from conception through construction. Our arch bridges reflect this design philosophy applied to small and large structures in both steel and concrete.

read more › 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.

read more › OPAC maintain state-of-the-art tools for 3D analysis of construction configurations of complex modern bridge structures. We understand the unique requirements of building major bridges, from both design and construction perspectives. Our proprietary technology enables complete project specific customization and rapid evaluation of proposed procedures for compliance with contract specifications. We can rapidly evaluate different construction options to determine which can best meet the needs of both the contractor and the owner.

read more › OPAC maintains leading-edge technologies for seismic evaluation and design of structures. We have developed and refined these technologies for their use on some of the largest and most important transportation structures in western North America, Asia, and South America. OPAC can apply a wide range of seismic engineering tools, appropriate to the type of structure including its seismic exposure and level of expected performance. This can be used for initial investigations, parameter studies, design development, and final design of a wide variety of structures.

read more › Our core analytical tool for segmental bridges is SFRAME/S3D(C), an advanced version of the SFRAME computer program developed by OPAC Vice President Dr. Mark Ketchum in the 1980's. It provided one basis for the 1989 AASHTO Guide Specifications for Segmental Bridges. OPAC has since upgraded the program for faster operation, cable-stayed and composite capabilities, and better creep models. SFRAME/S3D(C) has been used and validated in construction control, design, research, and forensic applications of all bridge types.

Reviews
Review Opac Consulting Engineers

Be the first to review Opac Consulting Engineers.

Write a Review

We recommend