SEISMIC RESPONSE OF LOW ASPECT RATIO REINFORCED CONCRETE SHEAR WALLS Bismarck Luna Ph.D. Candidate Civil, Structural and Environmental Engineering, University.

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Presentation transcript:

SEISMIC RESPONSE OF LOW ASPECT RATIO REINFORCED CONCRETE SHEAR WALLS Bismarck Luna Ph.D. Candidate Civil, Structural and Environmental Engineering, University at Buffalo

2 Quake Summit 2012, Boston, Massachusetts National Science Foundation Dr. Joy M. Pauschke, NEESR Program Director Project team members University at Buffalo Jonathan Rivera, Joshua Rocks, Dr. Caglar Goksu (ITU), Emma Lejeune (Cornell REU), Prof. Andrew Whittaker (PI) University of California, Berkeley Catherine Whyte, Prof. Bozidar Stojadinovic (Co-PI) University of Washington Joshua Pugh, Anna Birely, Prof. Laura Lowes (Co-PI) California Polytechnic State University, San Luis Obispo Prof. Abraham Lynn (Co-PI) LPCiminelli, Inc. MCEER ( Acknowledgement

Goals Specimen details Test setup Instrumentation Global response Peak shear strength Lateral stiffness Strength degradation Future work 3 Outline of presentation Quake Summit 2012, Boston, Massachusetts

Acquire robust information on the seismic behavior of low aspect ratio rectangular RC shear walls Provide simulation tools as needed Revise predictive equations for shear strength and stiffness Understand force transfer in walls at different levels of drift Develop macro-level hysteretic models Update fragility functions and damage states Response modification factors 4 Goals Quake Summit 2012, Boston, Massachusetts

Wallh w /l w Web Boundary Element ρ l (%) ρ t (%) ρ l (%) ρ t (%) SW SW SW SW SW SW SW SW SW SW SW *67*102* SW *67*102* SW9 SW12 5 Specimen details Quake Summit 2012, Boston, Massachusetts

Test fixture setup Specimen SW2 6 Test setup Quake Summit 2012, Boston, Massachusetts

In-plane string potentiometers and temposonics Out-of-plane string potentiometers Krypton system Strain gages 7 Instrumentation Quake Summit 2012, Boston, Massachusetts

Gigapan system 8 Instrumentation Quake Summit 2012, Boston, Massachusetts

SW3 9 Global response SW4 SW6 SW7 Quake Summit 2012, Boston, Massachusetts

SW3 Specimen C1C2 C2/C1 Measured (kips) ACI 318 §21.9 (kips) SW SW SW SW SW SW SW SW SW Peak shear strength Quake Summit 2012, Boston, Massachusetts

11 Peak shear strength Quake Summit 2012, Boston, Massachusetts

SW3 12 Lateral stiffness

Specimen Measured initial stiffness (kips/in) Theoretical ‘uncracked’ (kips/in) ASCE ‘cracked’ (kips/in) Secant stiffness at peak resistance (kips/in) Col. 5 / Col. 4 SW SW SW SW SW SW SW SW SW Lateral stiffness SW3

14 Strength degradation Quake Summit 2012, Boston, Massachusetts Specimen SW SW SW SW SW SW SW SW SW SW8

15 Future work Testing of the remaining two specimens Data reduction Processing Krypton data Analysis of cracks and strain gage data Processing Gigapan images Quake Summit 2012, Boston, Massachusetts

THANK YOU Quake Summit 2012, Boston, Massachusetts