Development of a Precast Bent Cap System for Seismic Regions (2011) / Chapter Skim
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The primary goal of NCHRP Project 12-74 was to develop and validate design methodologies, design and construction specifications, design examples, and example connection details for precast bent cap systems using emulative and hybrid connections for integral and nonintegral systems for all seismic regions throughout the United States. This goal was achieved through a diverse experimental and analytical program focused on a select set of connection details.
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The use of the stay-in-place corrugated steel pipe serving as joint shear reinforcement provided sufficient joint shear resistance when subjected to column overstrength demands. The cap pocket limited ductility specimen experienced noticeably more joint damage when subjected to lateral loading consistent with column flexural hinging.
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Based on a review of the experimental and analytical efforts conducted under NCHRP Project 12-74, the following conclusions can be drawn: • The current joint shear design methodology contained in the 2009 Guide Specifications for LRFD Seismic Bridge Design (1) is appropriate for the design of emulative and hybrid, integral and nonintegral precast bent cap systems with minor modifications.
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• To provide reliable inelastic behavior, the integral system should be specially detailed at the girder end, including bottom flange confinement and well-anchored shear stirrups. • Open soffit, integral precast bent caps should be designed considering an appropriate torsional resistance mechanism to distribute column overstrength actions into the superstructure girders.
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