NCHRP Report 527, Integral Steel Box-Beam Pier Caps, contains the findings of research to develop recommended details, design methodologies, and specifications for integral connections of steel superstructures to concrete substructures. An example illustrating the design of the connection of the cap beam to the girders and column is also included. Accompanying CRP-CD-47 contains detailed information on the laboratory testing program.

An integral connection provides some degree of continuity between the substructure and adjacent superstructure spans. Simple-span girders made integral with the concrete substructure provide continuity for live load and may reduce fabrication and erection costs. Continuous girders made integral with the concrete substructure can enhance seismic performance and increase clearance.

A composite steel girder bridge superstructure weighs substantially less than a concrete superstructure. This reduction of mass in the superstructure reduces the bridge's seismic susceptibility. Nevertheless, the mass of large concrete bent caps or hammerhead piers used to support the superstructure can offset the reduced weight of the steel. Integral construction eliminates this mass, increases clearance, and provides improved aesthetics.

The objective of this project was to develop recommended details, design methodologies, and specifications for integral connections of steel superstructures to concrete substructures. The report's recommendations are based on experimental verification of the effectiveness of the integral connection. Specifications and connection details to achieve the full benefits of continuity are recommended based on the physical testing and analysis., Integral Steel Box-Beam Pier Caps, contains the findings of research to develop recommended details, design methodologies, and specifications for integral connections of steel superstructures to concrete substructures. An example illustrating the design of the connection of the cap beam to the girders and column is also included. Accompanying CRP-CD-47 contains detailed information on the laboratory testing program.

An integral connection provides some degree of continuity between the substructure and adjacent superstructure spans. Simple-span girders made integral with the concrete substructure provide continuity for live load and may reduce fabrication and erection costs. Continuous girders made integral with the concrete substructure can enhance seismic performance and increase clearance.

A composite steel girder bridge superstructure weighs substantially less than a concrete superstructure. This reduction of mass in the superstructure reduces the bridge's seismic susceptibility. Nevertheless, the mass of large concrete bent caps or hammerhead piers used to support the superstructure can offset the reduced weight of the steel. Integral construction eliminates this mass, increases clearance, and provides improved aesthetics.

The objective of this project was to develop recommended details, design methodologies, and specifications for integral connections of steel superstructures to concrete substructures. The report's recommendations are based on experimental verification of the effectiveness of the integral connection. Specifications and connection details to achieve the full benefits of continuity are recommended based on the physical testing and analysis.