Seismic. L: Grouted. Department University
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1 eismic Performance of Next t Generation Bridge Components for Accelerat ted Bridge Construction (ABC) TET MODEL L: Grouted Couplerr No Pedestal (GCNP) Graduate Assistant: Zachary B. Haber, PhD tudent P. I. : M. aiid aiidi, PhD, P.E. CO-P.I. : David anders, PhD Department of Civil & Environmental Engineeringg University of Nevada, Reno Caltrans Research Program Manager: aad El-Azazy, PhD, P.E. DATE: 8/16/2011
2 Brief Project Description: The use of prefabricated structural elements iss an integral part of many accelerated bridge construction (ABC) efforts. The connection of these prefabricated elements to the rest of the structural system is critical to the performance of the structure under service loads and extreme events. This project investigates the seismic response of rigid connections between precast columns and footing. Five half-scale column models will be tested by reversedd cyclic loading. The baseline model used in this study is a conventional cast-in-place reinforced concrete column; this model is denoted in this study as CIP. Caltrans eismic Design Criteria (DC) was used to determine internal reinforcing steel to achieve a displacement ductility of 5. Furthermore, all detailing used in the CIP model adhered to Caltrans specifications. The four other column models to be tested in this study are composed of hollow precast concrete shells that are rigidly connectedd to the footing using mechanical rebar couplers located within the plastic hinge zone. After the rigid connection iss made, the hollow shells are filled with self consolidating concretee (CC). Two different mechanical couplers were selected for testing based on an extensive review of available literature. Coupler selection criteria included: mechanical performance under static and dynamic loading, Caltrans pre-qualification, and applicability to rapid construction. The two coupler types selected were the HRC 500 series upset headed coupler and the NMB grout sleeve coupler. Two models incorporate partial pedestalss in order to reduced demand on the coupler region. The data compiled will be compared with the performance of the columns with that of similar cast-in-place construction and any necessary refinements will be identified based on the data and analyses. The ultimate objective is to make recommendations to Caltrans regarding precast column connection details, design methodology, and constructionn techniques. Model ID CIP HCNP HCPP GCNP GCPP Test Matrix Coupler Type None HRC 500 HRC 500 NMB leeve NMB leeve Partial Pedestal None No Yes No Yes 2
3 Column Model Details: Height in (mm) Diameter in (mm) Longitudinal teel Ratio [%] Transverse teel Ratio [%] Aspect Ratio Axial Load kip (kn) Axial Load Index [%] 8 (2743) 24 (6) (903) Concretee & Grout Properties 7 Day trength Component psi (MPa) Footing (Conventional Concrete) 3350 (23.1) Column hell (Conventional Concrete) 2974 (20.5) Column Core (CC) 3612 (24.9) NMB Coupler Grout ( Mortar) 12,,837 (88.4) 28 Day trength psi (MPa) 4695 (32.3) 3826 (26.4) 4303 (29.6) 15,638 (7.7) teel Properties Expected Properties Transverse Bars: #3 Longitudinal Bars: #8 f y psi (MPa)) 68,000 (468) 68,000 (468) f u psi ( MPa) 95,0000 (655) 95,0000 (655) 3
4 Loading Protocol: Drift vs. Cycle Drift (%) Cycle
5 Calculated Pushover Curve Load (kip) CIP Test Result GCNP Calculated Result Displacement (in)
6 Model Reinforcement Details 3'-9" 2' W Loading Direction 2' E 1'-3" 6" 11 - #8 bars 1'-2" " #3 piral 2" Pitch NMB Coupler leeve " ection A-A 2' 11 - #8 bars ection A-A 8' 9' 1'-2" 1" " #3 piral 2" Pitch ection B-B ection B-B 2' " 5'-" 6
7 Instru / / / umentation / : train Gag ection 1-1 ection 2-2 ection /22 16 /23 14 /21 17 /24 ges G38 G39 G40 G29 G30 G31 Cross-s 7 ection 4-4 ection section Orientatio N W E on Loading W 3" Couple 1" 6" 1" Direction E er mid-section
8 Instrumentation: Displacement and Rotation A tring POTs Alll Corners D01 - D04 A W Loading Direction E D01 D04 D02 ection A-A D03 C04 C03 C02 C01 C08 7" C07 7" C06 7" C05 7" B01 B02 1" Coupler Location 8
9 Test et-up WET EAT Hollow-core Jacks teel Bearing Plate Axial Load preader Beam MT kip Actuator High trength Threaded Rods Grout Pad trong Floor 9
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