Development of Collapse Indicators for Risk Assessment of Older-Type Reinforced Concrete Buildings

This study examines the seismic collapse safety of older, non-ductile reinforced concrete building frames designed and constructed prior to the 1980s. The study considered idealized buildings with heights ranging from 4 to 12 stories. Performance was gauged using nonlinear dynamic analysis software considering nonlinearities associated with flexural yielding, shear failure, and axial failure. In addition to building height, the main variables were the relative strengths of columns and beams, and the relative shear and moment strengths in the columns. Incremental dynamic analysis was used to determine the probability of collapse for various combinations of the study variables. The results indicate that simple engineering indicators such as column-to-beam strength ratio and column flexural to shear strength ratio can be used to assess the collapse risk of older-type concrete buildings.

[1]  Dimitrios Vamvatsikos,et al.  Applied Incremental Dynamic Analysis , 2004 .

[2]  Jack P. Moehle,et al.  Program Plan for the Development of Collapse Assessment and Mitigation Strategies for Existing Reinforced Concrete Buildings | NIST , 2010 .

[3]  Jack P. Moehle,et al.  Axial Capacity Model for Shear-Damaged Columns , 2005 .

[4]  Jack P. Moehle,et al.  Drift Capacity of Reinforced Concrete Columns with Light Transverse Reinforcement , 2005 .

[5]  J. Peters,et al.  Uniform Building Code , 2014 .

[6]  Kenneth J. Elwood,et al.  Modelling failures in existing reinforced concrete columns , 2004 .

[7]  Gregory G. Deierlein,et al.  Seismic Collapse Safety of Reinforced Concrete Buildings. II: Comparative Assessment of Nonductile and Ductile Moment Frames , 2011 .

[8]  J. Browning,et al.  Reduction of Column Yielding During Earthquakes for Reinforced Concrete Frames , 2003 .

[9]  Asce,et al.  Seismic Evaluation of Existing Buildings , 2003 .

[10]  Luis Ibarra,et al.  Hysteretic models that incorporate strength and stiffness deterioration , 2005 .

[11]  Curt B. Haselton,et al.  Seismic Collapse Safety of Reinforced Concrete Buildings. I: Assessment of Ductile Moment Frames , 2011 .

[12]  J. P. Moehle,et al.  Development of Collapse Indicators for Older-Type Reinforced Concrete Buildings , 2012 .

[13]  Jack P. Moehle,et al.  Dynamic collapse analysis for a reinforced concrete frame sustaining shear and axial failures , 2008 .

[14]  Jack P. Moehle,et al.  "BUILDING CODE REQUIREMENTS FOR STRUCTURAL CONCRETE (ACI 318-11) AND COMMENTARY" , 2011 .