Experimental investigation of RC beam-slab substructures against progressive collapse subject to an edge-column-removal scenario

Lu, Xinzheng; Lin, Kaiqi; Li, Yang; Guan, Hong; Ren, Peiqi; Zhou, Yucai

doi:10.1016/j.engstruct.2016.07.039

Cited by 176 publications

(69 citation statements)

References 31 publications

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“…The structural behavior of RC frame (beam-column) structures under a column removal scenario has been studied analytically (Alogla et al 2017;Li et al 2011;Li et al 2014;Qian and Li 2013), experimentally (Lu et al 2017;Ren et al 2016;Xiao et al 2015;Yi et al 2008) and numerically (Kim et al 2009;Pham et al 2017;Pham et al 2016) to some extent. Fewer published studies are pertinent to the progressive collapse of RC flat-plate structures.…”

Section: Existing Work On Progressive Collapse Of Rc Flat Platesmentioning

confidence: 99%

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Load Transfer and Collapse Resistance of RC Flat Plates under Interior Column Removal Scenario

et al. 2018

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Reinforced concrete (RC) flat-plate structures are vulnerable to punching shear failure at their slab-column connections, potentially leading to a catastrophic progressive collapse. In practice, the slab-column connection above an interior column, removed due to abnormal loads, may be subjected to a concentrated downward force due to the absence of the supporting column and further being pushed due to different live load intensities on individual stories. This force is different to the full design load that the column withstands in normal situation and, combined to the gravity load acting on the slab, may cause punching shear failure at the interior slabcolumn connection. This will further trigger failure propagation to the surrounding slab-column connections. This paper presents the experimental tests performed on two identical large scale 2×2-bay RC flat-plate specimens under an interior column removal scenario. A 5 kPa uniformly distributed load was applied first to the slab followed by an incremental concentrated force imposed on the slab-column connection above the removed interior column. The complete collapse resistant behavior and load redistribution pattern of the specimens were investigated and are reported herein. Results show that more than 90% of the applied concentrated force is solely distributed to the four nearest adjacent columns. Three load carrying mechanism phases, in form of flexural, tensile membrane, and a combination of one-way catenary and dowel actions can be distinguished in resisting the applied concentrated load.

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Section: Existing Work On Progressive Collapse Of Rc Flat Platesmentioning

confidence: 99%

“…A live load of 5 kPa, representing a medium vehicle traffic condition, was adopted in the design. The substructure was scaled by a factor of 1/3 for testing, which falls into the typical range used in experimental investigation of the structural behavior of similar concrete specimens (Lu et al 2017;Ren et al 2016;Yi et al 2014).…”

Section: Specimen Preparationmentioning

confidence: 99%

Load Transfer and Collapse Resistance of RC Flat Plates under Interior Column Removal Scenario

et al. 2018

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“…In doing so, the beam‐column joint and the adjoining frame columns can be protected. Based on a column removal scenario, Li et al revealed that the progressive collapse resistance of an RC frame is largely dependent on the catenary mechanism of the frame beam. Further studies by Yu and Tan, Qian et al, Ren et al, and Lu et al, and indicated that the resistance of an RC beam under the catenary mechanism is dominated by the area of the continuously arranged longitudinal reinforcement. Note that the proposed structural detailing does not change the total area of the continuously arranged longitudinal reinforcement in a beam.…”

Section: Experimental Schemementioning

confidence: 99%

“…The corresponding values of the three key points are compared in Table 2 for all the three specimens. Many existing experimental studies [14][15][16]29 demonstrate that the displacement corresponding to rebar rupture is associated with specific randomness during the stage of catenary mechanism. Hence, the loading point (D 0.20 , F 0.20 ) corresponding to the required chord rotation capacity (ie, 0.20 rad) in the DoD guideline 10 is adopted to compare the resistance of different specimens at this stage.…”

Section: Progressive Collapse Testsmentioning

confidence: 99%

A novel structural detailing for the improvement of seismic and progressive collapse performances of RC frames

Lin

et al. 2019

Earthq Engng Struct Dyn

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Summary Earthquake‐induced building collapse and progressive collapse due to accidental local failure of vertical components are the two most common failure modes of reinforced concrete (RC) frame structures. Conventional design methods usually focus on the design requirements of a specific hazard but neglect the interactions between different designs. For example, the progressive collapse design of an RC frame often yields increased reinforcement and flexural strength of the beams. As a result, the seismic design principle of “strong‐column‐weak‐beam” may be violated, which may lead to unfavorable failure modes and weaken the seismic performance. To avoid these adverse effects of the progressive collapse design on the seismic resistance of RC frames, a novel structural detailing is proposed in this study. The proposed detailing technique intends to concurrently improve the seismic and progressive collapse performances of an RC frame by changing the layout of the newly added longitudinal reinforcement against progressive collapse without introducing any additional reinforcement. A six‐story RC frame is used as the prototype building for this investigation. Both cyclic and progressive collapse tests are conducted to validate the performance of the proposed structural detailing. Based on the experimental results, detailed finite element (FE) models of the RC frame with different reinforcement layouts are established. The seismic and progressive collapse resistances of different models are compared based on the incremental dynamic analysis (IDA) and nonlinear dynamic alternate path (AP) methods, respectively. The results indicate that the proposed structural detailing can effectively resolve the conflict between the seismic and progressive collapse designs.

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“…The level of permanent strain was significantly lower in the reinforced masonry walls, shown its ability to prevent progressive collapse [37]. Lu et al [38] and Pham et al [39] evaluated the behavior of slabs in the occurrence of a progressive collapse. These authors concluded that the residual strength of slabs, given by membrane mechanisms contribute to the resistance of progressive collapse.…”

Section: Current Researchmentioning

confidence: 99%

Discussion about progressive collapse of masonry buildings

Felipe

Haach

2019

Rev. IBRACON Estrut. Mater.

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ResumoMost standards indicate the need of the evaluation of abnormal loads in the structural design, but in general, they do not provide many details about these actions and how to consider them in the design. The consequence of not considering these actions may be to the progressive collapse of the structure. This type of failure can be avoided by design of elements with sufficient robustness to control possible localized damage, ensuring adequate time for emergency measures to be taken. This work aims to discuss the progressive collapse and the behavior of masonry buildings subject to abnormal loads. An extensive literature review is carried out, highlighting the main procedures and strategies to mitigate this issue and the guidelines available in the standards. It is concluded that there is still an absence of works that deal with this kind of action in masonry buildings.A maioria dos códigos normativos cita a necessidade da avaliação de ações excepcionais no projeto de estruturas, porém sem fornecer muitos detalhes de quais seriam estas ações e como considerá-las. A consequência da não consideração destas ações pode levar ao colapso progressivo da estrutura. Este tipo de ruína pode ser evitado projetando-se estruturas com robustez suficiente para controlar possíveis danos localizados, proporcionando tempo suficiente para que medidas de emergência sejam realizadas. Este trabalho tem como objetivo discutir o colapso progressivo e o comportamento de edifícios em alvenaria estrutural sujeitos a ações excepcionais. Para tal, uma extensa revisão teórica é realizada, destacando os principais procedimentos e estratégias para mitigação dessa problemática e as diretrizes de projeto disponíveis nos códigos normativos. Conclui-se que ainda faltam trabalhos específicos que tratam sobre as ações excepcionais em edifícios de alvenaria estrutural.Palavras-chave: alvenaria, danos acidentais, colapso progressivo, robustez.

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Experimental investigation of RC beam-slab substructures against progressive collapse subject to an edge-column-removal scenario

Cited by 176 publications

References 31 publications

Load Transfer and Collapse Resistance of RC Flat Plates under Interior Column Removal Scenario

Load Transfer and Collapse Resistance of RC Flat Plates under Interior Column Removal Scenario

A novel structural detailing for the improvement of seismic and progressive collapse performances of RC frames

Discussion about progressive collapse of masonry buildings

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