Abstract
A static loading test was carried out on a 1/3‐scale concrete‐filled square steel tubular column‐steel beam frame (CFSTSBF) specimen with 2 spans to study its progressive collapse behaviors under the middle column failure scenario using the alternate load path method and to examine the failure mode and load transfer and main resistance mechanisms of the residual structure. Then, theoretical models of the specimen, involving the whole collapse process, were developed, and the resistance and deformation relationships of each model were calculated and validated with test results. The results indicated that the specimen collapse process includes the elastoplastic stage, plastic stage, transfer stage, and catenary stage, the beam mechanism and catenary mechanism were the principal mechanisms for the structure against progressive collapse, and catenary action can significantly strengthen structural resistance. The modified theoretical models with higher practical accuracy could be used to assess structural performances against progressive collapse.
Highlights
Progressive collapse can be defined as the propagation of the local initial failure caused by accidents, such as explosion, impact, and seismic, among the structural members of the building, eventually resulting in a larger scope of structural damage and even overall collapse [1,2,3]
It has two significant characteristics: the uncertainty of the initial failure location and disproportion of the final failure compared to the initial damage. e collapse of the US World Trade Center building is a typical collapse event in which the final damage is disproportionate to the initial; it demonstrates that a progressive collapse would incur serious consequences [4]. e uncertainty of the local damage further increases the analysis difficulty of structural performance against progressive collapse
Incorporating the impact of the initial failure time, the outcomes of the model were identical with the test results of reinforcement concrete and steel structure, but its application on progressive collapse resistance of the steel-concrete composite structure was not validated
Summary
Progressive collapse can be defined as the propagation of the local initial failure caused by accidents, such as explosion, impact, and seismic, among the structural members of the building, eventually resulting in a larger scope of structural damage and even overall collapse [1,2,3]. Incorporating the impact of the initial failure time, the outcomes of the model were identical with the test results of reinforcement concrete and steel structure, but its application on progressive collapse resistance of the steel-concrete composite structure was not validated. On the basis of the method that assessed the structural dynamic response using the nonlinear static analysis approach, developed by Izzuddin et al [14], the present paper conducted a static loading test on concrete-filled square steel tubular column-steel beam frame (CFSTSBF) specimen to explore its progressive collapse resistance under the middle column removal scenario. On the basis of the method that assessed the structural dynamic response using the nonlinear static analysis approach, developed by Izzuddin et al [14], the present paper conducted a static loading test on concrete-filled square steel tubular column-steel beam frame (CFSTSBF) specimen to explore its progressive collapse resistance under the middle column removal scenario. e collapse process of the CFSTSBF specimen can be divided into four stages, by discussing its deformation shapes, failure patterns, and load transfer and resistance mechanisms in the test duration. en, a theoretical model for each stage was proposed to calculate resistance functions, i.e., resistance and deformation relationships of the specimen
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