Experimental and numerical investigation on progressive collapse resistance of reinforced concrete beam column sub-assemblages
TL;DR: In this article, a component-based joint model was proposed and incorporated into macromodel-based finite element analysis in which beams were modeled with fiber elements to simulate the structural responses of the specimens with severe geometric and material nonlinearity.
About: This article is published in Engineering Structures.The article was published on 2013-10-01. It has received 300 citations till now. The article focuses on the topics: Progressive collapse & Beam (structure).
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TL;DR: In this paper, the authors present an ambitious review that describes all the main advances that have taken place since the beginning of the 21st century in the field of progressive collapse and robustness of buildings.
257 citations
TL;DR: In this article, the performance of bolted steel beam-column joints under a central-column-removal scenario was investigated. And the authors provided the behaviour and failure modes of different connections, including their abilities to deform in catenary mode.
224 citations
TL;DR: In this article, the effects of the top and bottom reinforcement ratios at the joint interfaces and beam span-to-depth ratio on structural behavior were studied under a middle column removal scenario.
Abstract: Six RC beam-column subassemblages, consisting of two single-bay beams, one middle joint, and two end column stubs, were quasi-statically tested under a middle column removal scenario. The tests were aimed at investigating whether there are alternate load paths that can mitigate progressive collapse. With adequate axial restraints, both compressive arch action (CAA) and catenary action could be mobilized, significantly increasing the structural resistance beyond the beam flexural capacity. The effects of the top and bottom reinforcement ratios at the joint interfaces and beam span-to-depth ratio on structural behavior were studied. The results show that CAA is more beneficial to subassemblages with a short span-to-depth ratio and a low reinforcement ratio, whereas catenary action is more favorable to subassemblages with a large span-to-depth ratio and a high reinforcement ratio, particularly the top reinforcement ratio. As the last defense mechanism to prevent structural collapse, the development o...
211 citations
Cites background or methods from "Experimental and numerical investig..."
...Specimen design Six one-half scaled RC beam-column sub-assemblages were designed based on the detailing of specimens S1 and S2 (Yu and Tan 2011), consisting of two single-bay beams, a middle joint and two enlarged column stubs at the beam ends....
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...16(b), since axial compression increased the ultimate moment resistance via M-N interaction (Yu and Tan 2011)....
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...After two preliminary tests were conducted on RC beam-column sub-assemblages (Yu and Tan 2010a; 2011), another six specimens were tested with an improved test set-up to investigate the effects of 1) reinforcement ratio through joints, 2) reinforcement detailing at joint regions, and 3) beam…...
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...Currently, only a few experimental programs have been conducted to deepen the understanding of structural behavior of RC structures under a middle column removal scenario (Orton et al. 2009; Sasani and Kropelnicki 2008; Su et al. 2009; Yi et al. 2008; Yu and Tan 2011)....
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...…mm wide and 250 mm deep for all specimens, i.e. b = 150 mm and h =250 mm; The concrete cover thickness was 20 mm for all specimens; total net span L=2Ln+250 (mm); Test results of S1 and S2 are shown in paper (Yu and Tan 2011) †: “S” indicates seismic detailing in terms of arrangement of stirrups....
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TL;DR: In this article, the effect of critical structural parameters (i.e., the beam height, slab thickness and seismic reinforcement) on the collapse resistance was investigated by analyzing the applied loads, structural deformations and material strains.
153 citations
TL;DR: In this paper, the interaction between the infill walls and the reinforced concrete (RC) frame members in the progressive collapse process was examined experimentally in two 1/3 scaled, four-bay, two-story RC frame specimens.
125 citations
References
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Book•
01 Jan 2003
TL;DR: In this paper, a two-and three-dimensional analysis of Reinforced Concrete is presented, and the effect of path-dependency on the stress transfer across interface in reinforced concrete through aggregate interlock action.
Abstract: Part 1: Analysis and Modeling of Reinforced Concrete 1 Introduction 2 Two-Dimentional Analysis of Reinforced Concrete 3 Three-Dimentional Analysis of Reinforced Concrete 4 Analysis of Underground Structure and Soil-Structure Interactions 5 Analysis of Shell and Framed Structure 6 Analysis of Strengthened/Retrofitted Structures with Steel Encasement and Fiber Reinforced Wrapping 7 Analysis of Pre-Cracked Reinforced Concrete Member in Shear and Effect of Path-Dependency Part 2: Constitutive Model of Reincorced Concrete 8 Analysis of Stress Transfer Across Interface in Reinforced Concrete 9 Elasto-Plastic Fracture Model for Un-Cracked Concrete 10 Stress Transfer Across Crack in Reinforced Concrete Through Aggregate Interlock Action 11 Bond and Tensile Mechanics of Reinforced Concrete 12 Reinforcing Bar Model Under Arbitrary Loading Paths
481 citations
TL;DR: In this paper, the authors demonstrate the feasibility of using a static unloading approach to simulate column loss in investigating the progressive failure of a reinforced concrete frame due to the loss of a lower story column.
Abstract: This paper demonstrates the feasibility of using a static unloading approach to simulate column loss in investigating the progressive failure of a reinforced concrete frame due to the loss of a lower story column. A four-bay and three-story one-third scale model representing a segment of a larger planar frame structure was tested. A constant vertical load was applied to the top of the middle column by a servo-hydraulic actuator to simulate the gravity load of the upper floors and the failure of the middle column of the first story was simulated by unloading a mechanical jacking system. The frame collapse, defined in this study as the rupture of tension steel bars in the floor beams, occurred at a vertical unloading displacement of 456 mm (18 in.) that corresponds to a beam drift angle of 10.3 degrees. The mechanical behavior of the model frame is analyzed and the redistribution and transition of the load resisting mechanisms is discussed. During the progressive collapse process, the RC frame structure experience 3 distinct phases in its response: elastic, plastic and catenary phases. Findings indicate that the calculated capacity of the frame based on the plastic limit state was approximately 70% of the tested failure capacity if catenary effects are also included. The findings in this study can contribute to the future development of collapse-resistant design methods.
400 citations
TL;DR: In this article, a model is developed to represent the response of reinforced-concrete beam-column joints under reversed-cyclic loading, where failure of the joint core under shear loading and anchorage failure of beam and column longitudinal reinforcement embedded in the joint are considered.
Abstract: A model is developed to represent the response of reinforced-concrete beam-column joints under reversed-cyclic loading The proposed model provides a simple representation of the primary inelastic mechanisms that determine joint behavior: Failure of the joint core under shear loading and anchorage failure of beam and column longitudinal reinforcement embedded in the joint The model is implemented as a four-node 12-degree-of-freedom element that is appropriate for use with typical hysteretic beam-column line elements in two-dimensional nonlinear analysis of reinforced concrete structures Constitutive relationships are developed to define the load-deformation response of the joint model on the basis of material, geometric, and design parameters Comparison of simulated and observed response for a series of joint subassemblages with different design details indicates that the proposed model is appropriate for use in simulating response under earthquake loading
329 citations
TL;DR: In this paper, the compressive arch action due to longitudinal restraint can significantly enhance the flexural strength of a beam subjected to vertical loads, and the results validated an analytical model that has considered the axial restraining effects on beam loading capacity.
Abstract: Twelve specimens representing reinforced concrete frame beams were tested to investigate their gravity load-carrying capacity against progressive collapse. In these tests, the beams within the frame subassemblies were restrained longitudinally against axial deformation. The tests indicated that the compressive arch action due to longitudinal restraint can significantly enhance the flexural strength of a beam subjected to vertical loads. The compressive arch action was observed to be a function offlexural reinforcement ratio and ratio of beam span to depth. The test results validated an analytical model that has considered the axial restraining effects on beam loading capacity. The application of compressive arch effect to the prevention of progressive collapse is discussed.
267 citations