Robustness Assessment of Exterior Precast Concrete Frames under Column Removal Scenarios
Publication: Journal of Structural Engineering
Volume 142, Issue 12
Abstract
This paper describes an experimental investigation on the resistance and failure mode of four precast concrete frames. Each frame comprised a middle beam-column joint, a double-span beam, and two side columns. Two parameters, namely, reinforcement detailing in the beam-column joint and dimensions of the side columns, were investigated in the experimental program. Frame specimens were loaded on the middle joint by a vertical servohydraulic actuator, and corresponding horizontal reaction forces were recorded through load cells connected to the side columns. Experimental results and observations indicate that precast concrete frames were capable of developing compressive arch action (CAA) at the initial loading stage. However, frames with smaller side columns exhibited shear failure in the side joint. This hindered the development of catenary action in the bridging beam. By increasing the dimensions of the side columns, significant catenary action developed in the frames, and eventually flexural failure of the side columns took place resulting from horizontal tension force from the bridging beam. Experimental results suggest that horizontal forces induced by CAA and catenary action in the bridging beam have to be considered in the design of side columns and beam-column joints against progressive collapse.
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Acknowledgments
The authors would like to express their gratitude to Protective Technology Research Centre in Nanyang Technological University, Singapore, for its financial support.
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Information
Published In
Journal of Structural Engineering
Volume 142 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 3, 2015
Accepted: May 27, 2016
Published online: Jul 14, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 14, 2016
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