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CHAPTER 4: THE CONSTRUCTION PROCESS OF SEGMENTAL BRIDGES - page 42 / 47

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Chapter 4: The Construction Process of Segmental Bridges

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AASHTO Standard Specifications for Highway Bridges (AASHTO 1996) are intended to apply to the design of segmental concrete bridges.”

These “Guide Specifications for Design and Construction of Segmental Concrete Bridges” provide information specifically devised for segmental bridge construction. The manual comprises two main divisions, dealing with design specifications and with construction specifications.

Section headings of Division I—Design Specifications include general requirements and materials, analysis, design, detailing, substructure design, and special provisions for bridge types, specifications, contract drawings, and alternate construction methods (AASHTO 1998b). In particular, the subsections under these sections briefly deal with analytical methods, provide loads and applicable load factors, deal with seismic design, provide information on stresses, prestress losses, flexural strength, shear and torsion, fatigue stress limits, and deal with the specifics of anchorage zones. Furthermore, constructive details, such as ducts, couplers, concrete cover and reinforcement spacing, bearings, expansion joints, and cross-sectional dimensions for box girders are covered.

Subsection headings of Division II—Construction Specifications include a variety of materials, such as concrete, mild reinforcement and post-tensioning materials, and guidelines on construction procedures that are specific to the various methods of segmental bridge construction, e.g. installation, stressing of post-tensioning tendons and grouting of their ducts, application of epoxy as a joint sealant, geometry control, shop drawings, bearings, construction tolerances, and repair of minor defects. The last subsections deal with cast-in-place segmental construction, precast segmental construction, and incremental launching individually (AASHTO 1998b).

The AASHTO Standard Specifications for Highway Bridges (AASHTO 1996) is a very comprehensive compilation that provides information for a wide range of issues pertaining to design of construction of all kinds of highway bridges. The two main divisions, titled design and construction, respectively, deal with structural systems of bridges, materials and their properties and testing as well as with details, such as prestressing tendons and anchorages, bearings, joints,

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