NEES Research Demonstration PI: S. Wood UT Austin Purdue University Experimental Program Co-PI: J. Ramirez Collaborators: M. Eberhard and T. Ranf UW Purdue.

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Presentation transcript:

NEES Research Demonstration PI: S. Wood UT Austin Purdue University Experimental Program Co-PI: J. Ramirez Collaborators: M. Eberhard and T. Ranf UW Purdue Graduate Research Assistant: A. Makido

Purdue Experimental Program Specimen # (Bent 3 UNR) Column Height (in) Shear span to depth ratio a/d Spiral hoops Bent model D=12”(1/4 scale) Single column model D=24”(1/2 scale) f’ c = 5000 psi N = 0.08f’ c Ag (180 kips for Specimen 2 and 45 kips for Specimen 1 )

Test Set-Up

Specimen 1- Bent Column 16-#3 Bars 0.75 in. Cover 12 in. Ag= 113 in 2 ρg= 1.6 % ρs= 0.9 % (Specimen 1-1) = 0.6 % (Specimen 1-2) ρg : reinforcement ratio ρs : volume ratio of spiral hoop to the core volume Spirals 1.25 in. (Specimen 1-1) 2.25 in. (Specimen 1-2)

Specimen 2- Single Column 16-#6 Bars 1.5 in. Cover 24 in. Spirals in. (Specimen 2-1 and 2-2) in. (Specimen 2-3) Ag= 452 in 2 ρg= 1.6 % ρs= 0.9 % (Specimen 2-1,2-2) = 0.6 % (Specimen 2-3) ρg : reinforcement ratio ρs : volume ratio of spiral hoop to the core volume

6”6” 3”3” 2.5” d=24 ” d/2=12” 6”6” 3”3” 2.5” d/2=12” d=24 ” 120” Strain gage Instrumentation Plan Longitudinal strain gage Transverse strain gage Column Cross Section Loading direction

2.5” d=24” d/2=12” 2.5” d/2=12” d=24” 120” Potentiometer Instrumentation Plan Column Cross Section Loading direction Potentiometer Steel Angle Bar

Construction of Specimen 1-1 Spiral Hoop with InstrumentationCasting of column

Construction of Specimen 2-1 Assembling Spiral HoopCasting of column

Report on Concrete Strength for Specimen 1-1, day28 day56 day Specimen1-1 (Bent Column) Specimen 2-1 (Single Column) (psi)

Proposed Displacement History 1Δ’y1Δ’y 1.6Δ’ y 3.2Δ’ y 4.8Δ’ y 6.4Δ’ y 8Δ’y8Δ’y Pre-yielding Pre-cracking Δ’ y : average measured displacement corresponding to longitudinal reinforcement strain gauges first yield : Test Stage at Reno

Test Set-up of Specimen 2-1

Test Schedule SpecimenConstructionTest 2-1 (Single column) September 2004 August (Bent column) September (Single column) October- November 2005 December (Single column) 1-2 (Bent column) January 2006