Development of a Precast Bent Cap System for Seismic Regions (2011) / Chapter Skim
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Pages 94-101
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From page 94... ...
. • Emulative performance is concluded for the GD specimen based on the close match between its overall behavior and that of the CIP control specimen, including lateral forcedisplacement response; plastic hinging; joint shear stiffness; level of joint distress; pattern of joint cracking; strain patterns of bent cap and joint reinforcement; integral behavior between the bedding layer, column, ducts, and bent cap; and minor bar slip.
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From page 95... ...
can be concluded for the CPLD specimen. Similarities in performance between the limited ductility and full ductility specimens including plastic hinging; lateral force-displacement response; equivalent viscous damping; and integral behavior between the bedding layer, column, pipe, and bent cap support this conclusion.
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From page 96... ...
4.1.9 All Hybrid Specimens The use of fiber-reinforced grout in the bedding layer of hybrid specimens is expected to enhance overall performance by maintaining the integrity of the compression toe during cyclic loading. This is expected to minimize the observed reductions in lateral capacity during larger deformation cycles and enhance the self-centering performance of the systems.
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From page 97... ...
Integral bent caps will require reinforcement along the face of the bent cap based on longitudinal flexural response; however, additional reinforcement based on the 2009 LRFD SGS nonintegral specifications should be required. 4.2.5 Additional Joint Reinforcement for Grouted Duct Connections Based on the emulative response of the grouted duct specimen, design specifications for grouted duct connections should adopt the 2009 LRFD SGS provisions for additional joint shear reinforcement (As jvi, As jvo, As jl, and horizontal J-bars)
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From page 98... ...
However, the 2009 LRFD SGS (1) anchorage length equation, developed ′fc for CIP bent caps in SDCs C and D, and the AASHTO LRFD Bridge Design Specifications equation do not apply to precast bent cap connections.
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From page 99... ...
Second, the grouted duct and cap pocket connection design processes are straightforward. • SDC A design examples for grouted duct and cap pocket connections demonstrate that design specifications produce precast bent cap designs that are more conservative than CIP designs, due to the requirement for minimum joint shear (transverse)
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From page 100... ...
• Fabrication of precast bent caps using grouted ducts and cap pockets is feasible and relatively straightforward, facilitated by the use of readily available, stay-in-place corrugated ducts (grouted duct connection) or corrugated steel pipe (cap pocket connection)
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From page 101... ...
reinforcement; concrete fill in cap pocket void and bedding layer; 2-leg vertical stirrups without overlapping within the joint; supplementary hoop for full ductility; column bar anchorage nearly full depth; and optional U-bars for full ductility. – Grouted duct connections: stay-in-place, full-depth steel corrugated ducts; grout in grouted ducts and bedding layer; and column bar anchorage nearly full depth.
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