TY - JOUR
T1 - Progressive Collapse of 3D Composite Floor Systems with Rigid Connections under External Column Removal Scenarios
AU - Ren, Lu Ming
AU - Yang, Bo
AU - Chen, Kang
AU - Sun, Ya Juan
AU - Kong, De Yang
N1 - Funding Information:
The authors would like to acknowledge the financial support from the National Key Research and Development Program of China with Grant No. 2016YFC0701203, the National Natural Science Foundation of China (No. 51778086) and the funding support from the Chongqing Talents Plan for Young Talents (No. CQYC201905055).
Publisher Copyright:
© 2020 American Society of Civil Engineers.
PY - 2020/11/1
Y1 - 2020/11/1
N2 - Progressive collapse of building structures has been a hot research topic since the September 11, 2001, terrorist attacks. These works provide valuable information focused more on beam-column connections and two-dimensional (2D) substructures, and relative studies on three-dimensional (3D) structures are limited, especially high-quality experimental tests on 3D composite floor systems. As is known, external columns are entirely exposed to the outside environment, which makes them more susceptible to be damaged by extreme events like vehicular impact or explosion, as observed in the collapse of the Alfred P. Murrah Federal Building in Oklahoma City in 1995. In this study, two 1/3-scale 3D specimens with four types of connections, including web unreinforced flange bolted (WUFB) connection, fin plate (FP) connection, reduced beam section (RBS) connection, and double angle cleat (DAC) connection, were tested quasi-statically up to failure under external column removal scenarios. Based on the test results, the vertical load-displacement curves, failure modes, deflection profile, and strain development of the structural components were obtained and discussed in detail. The reaction force redistribution in the remaining columns and surrounding restraints was also investigated. Special attention was paid to the contributions of the main load-resisting mechanisms, namely, flexural action (FA), catenary action (CA), and tensile membrane action (TMA), on resisting progressive collapse. The analysis results suggest that, after the failure of an external column, FA would dominate in resisting progressive collapse. Although TMA does contribute to the mitigation of progressive collapse at the large-deformation stage, it plays a secondary role because the total load-carrying capacity has already been severely deteriorated. By contrast, CA might be negligible.
AB - Progressive collapse of building structures has been a hot research topic since the September 11, 2001, terrorist attacks. These works provide valuable information focused more on beam-column connections and two-dimensional (2D) substructures, and relative studies on three-dimensional (3D) structures are limited, especially high-quality experimental tests on 3D composite floor systems. As is known, external columns are entirely exposed to the outside environment, which makes them more susceptible to be damaged by extreme events like vehicular impact or explosion, as observed in the collapse of the Alfred P. Murrah Federal Building in Oklahoma City in 1995. In this study, two 1/3-scale 3D specimens with four types of connections, including web unreinforced flange bolted (WUFB) connection, fin plate (FP) connection, reduced beam section (RBS) connection, and double angle cleat (DAC) connection, were tested quasi-statically up to failure under external column removal scenarios. Based on the test results, the vertical load-displacement curves, failure modes, deflection profile, and strain development of the structural components were obtained and discussed in detail. The reaction force redistribution in the remaining columns and surrounding restraints was also investigated. Special attention was paid to the contributions of the main load-resisting mechanisms, namely, flexural action (FA), catenary action (CA), and tensile membrane action (TMA), on resisting progressive collapse. The analysis results suggest that, after the failure of an external column, FA would dominate in resisting progressive collapse. Although TMA does contribute to the mitigation of progressive collapse at the large-deformation stage, it plays a secondary role because the total load-carrying capacity has already been severely deteriorated. By contrast, CA might be negligible.
KW - Catenary action
KW - Column removal
KW - Experimental study
KW - Flexural action
KW - Progressive collapse
KW - Steel frame-composite floor structure
KW - Tensile membrane action
UR - http://www.scopus.com/inward/record.url?scp=85095966869&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)ST.1943-541X.0002805
DO - 10.1061/(ASCE)ST.1943-541X.0002805
M3 - Article
AN - SCOPUS:85095966869
SN - 0733-9445
VL - 146
JO - Journal of Structural Engineering (United States)
JF - Journal of Structural Engineering (United States)
IS - 11
M1 - 04020244
ER -