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NEES Project Warehouse

Using NEES as a Testbed for Studying Soil-Foundation-Structure Interaction: Shaking Table Tests
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Large-Scale Experimental Seismic Studies of a Two-Span Reinforced Concrete Bridge System
Experiment Type: Shake Table
Description: This document focuses on the shake table testing of a quarter-scale two-span reinforced concrete bridge specimen that was part of the SFSIproject. The scope includes the design of the prototype structure for the global project,development and implementation of an effective technique for experimentally testingbridges on multiple shake tables, analytical modeling of bridge model, and parametricstudies of system effects. The analytical model that was developed and experimentallyvalidated was used in conjunction with the measured data from testing to conduct furtherstudy on bridge system response and shake table testing of bridges.Seismic detailing of the prototype was based on the Caltrans SDC (Caltrans 2003)and NCHRP 12-49 Recommended LRFD Guidelines for the Seismic Design of HighwayBridges (ATC/MCEER 2001). General design of the prototype was based on theAmerican Association of State Highway and Transportation Officials AASHTO bridgespecifications (AASHTO 2002). The bridge specimen, which was composed of 11 majorcomponents, was designed to model the system interaction between three two-columnbridge bents of varying heights. It was created at quarter scale to maximize the size ofthe specimen while remaining below the capacity of the shake tables. The 11components were such that the specimen could be assembled on the shake tables, easilydisassembled, and, except for the three bents, be reusable. The total height of thespecimen to the top of the superstructure was 10.75 ft (3.28 m); the total length was 67.3ft (20.5 m). Span lengths were 30 ft (9.14 m) and the columns of the three bents hadclear heights of 6 ft, 8 ft, and 5 ft (1.83, 2.44, and 1.52 m) with the tallest bent in themiddle. The superstructure was composed of a solid slab that was post-tensioned in boththe longitudinal and transverse direction of the bridge. It was designed to maintaingenerally un-cracked stiffness properties throughout the tests and its stiffness matched thestiffness of the prototype about both bending axes.Both low and high amplitude testing was conducted on the bridge model.Earthquake motions that were used were calculated based on the measured records at theCentury City Country Club from the 1994 Northridge, California earthquake. The lowamplitude tests included transverse coherent and incoherent, and biaxial coherent targetmotions. Low amplitude motions were such that the longitudinal reinforcement in thecolumns did not yield. High amplitude tests were a transverse coherent motion that wasapplied in increments from a pre-yield demand (0.075g PGA) until bent failure (1.66gPGA) when the shortest of the bents failed in flexure from crushing of confined concreteand buckling of longitudinal reinforcement.
Dates: December 13, 2004 - February 23, 2005
Facility: University of Nevada-Reno, NV, United States
Equipment: View Details
Specimen Type: Reinforced concrete bridge
Material: Component 1 Component 1 (view)
Sensors: Longitudinal Column Bar Strain Gages
Column Curvature Gages
Transverse Column Bar Strain Gages
Superstructure Accelerometers
Superstructure Displacement Transducers
Bent 3 West Column Shear Transducers
Bent 3 Slip Displacement Transducers
Shaketables Location Plan
Drawings: more...
Data:
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Documentation:
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Tags (keywords):
  1. Soil Structure Interaction
  2. Reinforced Concrete
  3. Bridges
  4. Shake Table