Investigation on a mitigation scheme to resist the progressive collapse of reinforced concrete buildings

Abstract

This study presents the investigation of the approach which was presented by Thaer M. Saeed Alrudaini to provide the alternate load path to redistribute residual loads and preventing from the potential progressive collapse of RC buildings. It was proposed to transfer the residual loads upwards above the failed column of RC buildings by vertical cables hanged at the top to a hat steel braced frame seated on top of the building which in turn redistributes the residual loads to the adjacent columns. In this study a ten-storey regular structural building has been considered to investigate progressive collapse potential. Structural design is based on ACI 318-08 concrete building code for special RC frames and the nonlinear dynamic analysis is carried out using SAP2000 software, following UFC4-023-03 document. Nine independent failure scenarios are adopted in the investigation, including six external removal cases in different floors and three removal cases in the first floor. A new detail is proposed by using barrel and wedge to improve residual forces transfer to the cables after removal of the columns. Simulation results show that progressive collapse of building that resulted from potential failure of columns located in floors can be efficiently resisted by using this method.

Keywords

prevent progressive collapse / alternate load path / reinforced concrete buildings / nonlinear dynamic / retrofitting / cable / steel hat braced frame / barrel and wedge

References

[1] ASCE 7-05. Minimum Design Loads for Buildings and Other Structures. American Society of Civil Engineers (ASCE), Report: ASCE/SEI 7–05. Reston, VA, 2005

[2] GSA. Progressive Collapse Analysis and Design Guidelines for New Federal Office Buildings and Major Modernization Projects. General Services Administration, Washington DC, 2003

[3] Unified Facilities Criteria (UFC) 4–023–03. Design of Buildings to Resist Progressive Collapse. Department of Defense (DOD), 2010

[4] Unified Facilities Criteria (UFC) 4–023–03. Design of Buildings to Resist Progressive Collapse. Department of Defense (DoD), 2005

[5] Inhyok Song B. Experimental and analytical assessment on the progressive collapse potential of existing buildings. Master thesis, Columbus: The Ohio State University, 2010

[6] Astaneh-Asl A. Progressive collapse prevention in new and existing buildings. In: Proceedings of the Ninth Arab Structural Engineering Conference. Abu Dhabi, UAE, 2003, 1001–1008

[7] Orton S, Jirsa J O, Bayrak O. Carbon fiber-reinforced polymer for continuity in existing reinforced concrete buildings vulnerable to collapse. ACI Structural Journal, 2009, 106(5): 608–616

[8] Alrudaini T M S. A new mitigation scheme to resist the progressive collapse of reinforced concrete buildings. Dissertation for the Doctoral Degree, Wollongong: University of Wollongong, 2011

[9] SAP2000. Advanced Structural Analysis Program, Version 14.1. Computers and Structures, Inc. (CSI). Berkeley, CA, USA, 2010

[10] ACI 318-08. Building Code Requirements for Structural Concrete and Commentary. American Concrete Institute (ACI), Farmington Hills, MI, 2008

[11] Uniform Building Code U B C. Structural Engineering Design Provisions. International Conference of Building Officials, Whittier, California, 1997

[12] ASTM-A416. Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete

[13] Alan T. Performance of cable bolt anchors. Curtin University of Technology, WA school of mines, Kalgoorlie, Western Australia

[14] ATC-40. Applied Technology Council, Seismic Evaluation and Retrofit of Concrete Buildings. vols. 1 and 2. California, 1996

[15] Pachenari A, Keramati A, Pachenari Z. Investigation of progressive collapse in intermediate RC frame structures. The Structural design of tall and special buildings, wileyonlinelibrary.com), 2010

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg