Title: Mitigation of Collapse Risk in Vulnerable Concrete Buildings (NEES-2008-0637)

Year Of Curation: 2014

Description: This multi-institution award is an outcome of the NSF 06-504 program solicitation "George E. Brown, Jr. Network for Earthquake Engineering Simulation Research (NEESR)" competition. One of the greatest overall seismic risks in the United States is the risk of collapse of older concrete buildings in a major urban earthquake, yet there are no solutions to how to address this in a cost-effective manner. Policy makers and building owners are frustrated by the costs of retrofitting large inventories of existing buildings. Engineers need tools to accurately assess the risk of individual buildings and to differentiate between adequate buildings and potentially hazardous ones, so building owners can prioritize mitigation expenses. Regulatory agencies need better information on the regional extent of the risk so that effective policy measures can be put in place to effect regional mitigation efforts. This project will study the collapse potential of older nonductile concrete buildings, which are pervasive and high risk, to improve and disseminate effective engineering assessment and retrofit tools and to define appropriate incentive or policy measures to mitigate the risk. The research will investigate four areas: 1) Exposure - a single urban region will be selected to serve as a model for other regions, and an inventory model suitable to study the regional collapse risk of older type concrete buildings will be developed; 2) Component and System Performance - laboratory and field experiments will be conducted on components, subassemblies, and soil-foundation-structure systems to better understand conditions that lead to collapse; 3) Building and Regional Simulation - models will be developed and implemented in nonlinear dynamic analysis software useful to earthquake engineers, and results will be extended through regional dynamic simulations to help understand the regional distribution of building collapses in a major earthquake; and 4) Mitigation Strategies - effective mitigation strategies and coalitions involving engineers, planners, policy experts, and stakeholders will be developed to promote action for risk reduction. The program features a significant education component aimed at increasing diversity in earthquake engineering, international collaborations, and outreach to disseminate results to a broad community.

Award: http://www.nsf.gov/awardsearch/showAward?AWD_ID=0618804

PIs & CoPIs: Jack Moehle, Thalia Anagnos, Mary Comerio, Julio Ramirez, Jonathan Stewart

Dates: December 03, 2007 - November 20, 2012

Organizations:
University of California, Berkeley, CA, United States,
University of California, Los Angeles, CA, United States
Purdue University at West Lafayette, IN, United States

Facilities:
University of California, Berkeley, CA, United States
University of California, Los Angeles, CA, United States
University of Minnesota-Twin Cities, MN, United States
University of California, San Diego, CA, United States
Purdue University at West Lafayette, IN, United States

Sponsor: NSF 0618804

Keywords: risk, reinforced concrete columns, concrete buildings, concrete, collapse, nonductile

Publications:
Henkhaus, Kurt; Ramirez, Julio; Pujol, Santiago (2009), "Simultaneous Shear and Axial Failures of Reinforced Concrete Columns"
Matamoros, Adolfo; Matchulat, Lisa (2008), "Axial Load Failure of Shear Critical Columns Subjected to High Levels of Axial Load"
Woods, C.; Matamoros, A. (2010), "Effect of Longitudinal Reinforcement Ratio on the Failure Mechanism of R/C Columns Most Vulnerable to Collapse"
Matamoros, A.; Woods, C. (2010), "Drift at Axial Failure of R/C Columns Most Vulnerable to Collapse"
Woods, Charles (2010), "Displacement Demand Effects in Vulnerable Reinforced Concrete Columns"
Matchulat, Lisa (2009), "Mitigation of Collapse Risk in Vulnerable Concrete Buildings"
Givens, M.J.; Star, L.M.; Stewart, J.P. (2013), "Soil-Structure Interaction, Test Site No. 3, Experiment Setup Report"
Park, S.; Mosalam, K.M. (2012), "Experimental and Analytical Studies on Reinforced Concrete Buildings with Seismically Vulnerable Beam-Column Joints"
Hassan, Wael Mohammed (2011), "Analytical and Experimental Assessment of Seismic Vulnerability of Beam-Column Joints without Transverse Reinforcement in Concrete Buildings"
Elwood, K.J.; Matamoros, A.B.; Wallace, J.W.; Lehman, D.E.; Heintz, J.A.; Mitchell, A.D.; Moore, M.A.; Valley, M.T.; Lowes, L.N.; Comartin, C.D.; Moehle, J.P. (2007), "Update to ASCE/SEI 41 Concrete Provisions"
Anagnos T; Comerio MC; Goulet C; Na H; Steele J; Stewart JP (2008), "Los Angeles Inventory of Nonductile Concrete Buildings for Analysis of Seismic Collapse Risk Hazards"
Yavari S; Lin SH; Elwood KJ; Wu CL; Hwang SJ; Moehle JP (2008), "Study on Collapse of Flexure-Shear-Critical Reinforced Concrete Frames"
Elwood KJ; Moehle JP (2006), "Idealized Backbone Model for Existing RC Columns and Comparisons with FEMA 356 Criteria"
Mitchell A; Elwood K; Moehle J; Wallace J; Comartin C; Heintz J; Lehman D; Matamoros A; Moore M; Valley M. (2007), "Improved Predictions of Seismic Performance of Existing Concrete Buildings - ASCE/SEI 41, Supplement No. 1"
Star LM; Stewart JP; Graves RW; Kudnut KW (2008), "Validation against NGA empirical model of simulated motions for M7.8 rupture of San Andreas fault"
Graves RW; Aagaard BT; Hudnut KW; Star LM (2008), "Broadband simulations for Mw 7.8 southern San Andreas"
Wu, CL; Kuo, WW; Yang, YS; Hwang, SJ; Elwood, KJ; Loh, CH; Moehle, JP (2009), "Collapse of a nonductile concrete frame: Shaking table tests"
Moehle, Jack (2009), "Earthquake Collapse Risk of Older Buildings"
Comartin CD; Anagnos T; McCormick DL; Moehle JP (2009), "The Concrete Coalition: A Panel Discussion on Understanding the Policy, Inventory and Technical Problems Associated with Pre-1980 Concrete Buildings"
Anagnos T; Comerio MC; Goulet C; Steele J; Stewart JP (2010), "Development of a Concrete Building Inventory: Los Angeles Case Study for the Analysis of Collapse Risk"
Sammarco, E., and Matamoros, A (2010), "Plasticity-Based Nonlinear Finite Element Analysis of Reinforced Concrete Columns with Inadequate Seismic Detailing"
Mosalam, K.M., Talaat, M., and Park, S. (2008), "Modeling Progressive Collapse in Reinforced Concrete Framed Structures"
Mosalam, K.M., Park, S., Gunay, M.S.,.  (2009), "Evaluation of an Element Removal Algorithm for Reinforced Concrete Structures Using Shake Table Experiments"
Park, S. and Mosalam, K.M. (2009), "Shear Strength Models of Exterior Beam-Column Joints without Transverse Reinforcement"
Hassan WM; Park S; Lopez RR; Mosalam KM; Moehle JP (2010), "Seismic Response of Older-Type Reinforced Concrete Corner Joints"
Park S; Mosalam KM (2010), "Behavior of Reinforced Concrete Corner Beam-Column Joints without Transverse Reinforcement"
Yavari S;  Lin SH;  Elwood KJ;  Wu CL (2008), "Study on Collapse of Flexure-Shear-Critical Reinforced Concrete Frames"
Yavari, S., Lin S.-H., Wu C.-L., Elwood K. J., Hwang S-J., Bayhan B. and Moehle J.P. (2010), "Shake table tests on the collapse of RC frames subjected to moderate and high axial loads"
Yavari, S., S.-H.. Lin, C.-L. Wu, K. J. Elwood, S-J. Hwang, and J.P. Moehle (2009), "Experimental Study on Dynamic Behavior of Multi-Story Reinforced Concrete Frames with Non-Seismic Detailing"
Wu C.-L., Lin S.-H., Yavari, S., Weng P.-W., Hwang S-J., Elwood K. J., and Moehle J.P. (2009), "Design of Dynamic Collapse Testing System for 2-Story Reinforced Concrete Frames"
Prasad, S. and Hutchinson, T.C. (2011), "Attempts at simulating membrane effects in slabs using finite element analysis"
Hassan WM; Moehle JP (2012), "Experimental Assessment of Seismic Vulnerability of Corner Beam-Column Joints in Older Concrete Buildings"
Hassan WM; Moehle JP (2012), "A Cyclic Nonlinear Macro Model for Numerical Simulation of Beam-Column Joints in Existing Concrete Buildings"
Alemdar ZF; Matamoros A; Browning J (2011), "Modeling Surface Deformations and Hinging Regions in Reinforced Concrete Bridge"
Hassan WM; Moehle JP (2013), "Quantification of Residual Axial Capacity of Beam-Column Joints in Existing Concrete Buildings under Seismic Load Reversals"
Simpson B; Matamoros AB (2012), "Criteria for Evaluating the Effect of Displacement History and Span-to-Depth Ratio on the Risk of Collapse of R/C Columns"
Park S; Mosalam KM (2010), "Analytical and experimental study on RC exterior beam–column joints without transverse reinforcement"
Prasad S; Hutchinson TC (2014), "Evaluation of Older Reinforced Concrete Floor Slabs under Corner Support Failure"
Comerio MC; Anagnos T (2012), "Los Angeles Inventory: Implications for Retrofit Policies for Nonductile Concrete Buildings"
Alemdar, Zeynep Firat; Matamoros, Adolfo B.; Browning, JoAnn (2013), "High-Resolution Modeling of Reinforced Concrete Bridge Columns under Seismic Loading"
Yavari, S.; Elwood, K. J.; Wu, C-L.; Lin, S-H; Hwang, S-J.; Moehle, J. P. (2013), "Shaking Table Tests on Reinforced Concrete Frames without Seismic Detailing"
Park, Sangjoon; Mosalam, Khalid M. (2012), "Parameters for shear strength prediction of exterior beam-column joints without transverse reinforcement"
Ghannoum, Wassim M.; Moehle, Jack P. (2012), "Shake-Table Tests of a Concrete Frame Sustaining Column Axial Failures"
Star, Lisa M.; Stewart, Jonathan P.; Graves, Robert W. (2011), "Comparison of Ground Motions from Hybrid Simulations to NGA Prediction Equations"
Park, Sangjoon; Mosalam, Khalid M. (2012), "Analytical Model for Predicting Shear Strength of Unreinforced Exterior Beam-Column Joints"
Park, Sangjoon; Mosalam, Khalid M. (2013), "Experimental Investigation of Nonductile RC Corner Beam-Column Joints with Floor Slabs"
Ghannoum, Wassim M.; Moehle, Jack R. (2012), "Dynamic Collapse Analysis of a Concrete Frame Sustaining Column Axial Failures"
Henkhaus, Kurt; Pujol, Santiago; Ramirez, Julio (2013), "Axial Failure of Reinforced Concrete Columns Damaged by Shear Reversals"
Park, Sangjoon; Mosalam, Khalid M. (2013), "Simulation of Reinforced Concrete Frames with Nonductile Beam-Column Joints"
Anagnos, Thalia; Comerio, Mary C.; Goulet, Christine; May, Peter J.; Greene, Marjorie; McCormick, David L.; Bonowitz, David (2012), "Developing Regional Building Inventories: Lessons from the Field"
Comartin CD;  Anagnos T;  Faison H;  Greene M;  Moehle JP. (2008), "The Concrete Coalition: Building a Network to Address Nonductile Concrete Buildings "

• Jack Moehle, Thalia Anagnos, Mary Comerio, Julio Ramirez, Jonathan Stewart, Santiago Pujol (2017), "Mitigation of Collapse Risk in Vulnerable Concrete Buildings (NEES-2008-0637)," https://datacenterhub.org/deedsdv/publications/view/538.