Load-Carrying Mechanism to Resist Progressive Collapse of RC Buildings

Qian, Kai; Li, Bing; Ma, Jiaxing

doi:10.1061/(asce)st.1943-541x.0001046

Cited by 193 publications

(70 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The flexural capacity of the beams is likely inadequate to solely support the dynamic load, thus mechanisms occur at supports, and alternative resistance paths (e.g., catenary action from frame members or additional retrofit cables) are required to achieve equilibrium and avoid progressive collapse. The transition from flexural resistance to catenary resistance has been observed in experimental work comprising static application of load to structural systems of different materials [13][14][15][16][17][18][19][20][21][22]. The ultimate structural resistance in column removal is a form of catenary behavior that may be available in the frame itself and can also be provided through the use of retrofitted cables.…”

Section: Introductionmentioning

confidence: 99%

A Modified Catenary Model with Application to the Analysis and Design of Retrofit Cables for Progressive Collapse

2018

View full text Add to dashboard Cite

Progressive collapse, the extensive or complete collapse of a structure resulting from the failure of one or a small number of structural components, has become a focus of research efforts and design considerations following events occurring at the Ronan Point apartment building in London, the Murrah Federal Building in Oklahoma City, and the World Trade Center in New York City. A principle research and design area for progressive collapse investigates the behavior of structural frames when column support is removed. The mechanism that results from loss of column support in structural frames characteristically involves beams that are unable to provide sufficient flexural resistance. Cable retrofit is one method to enhance existing frames and supplement or replace the post-mechanism beam load resistance with straight-legged catenary resistance after a column removal. The cables are located linearly along the beam geometry and are affixed at beam supports. This paper investigates both static and dynamic behavior of the catenary action of retrofit cables, which include both the linear and nonlinear material behavior of the cable material. Moreover, a simplified model serves as the basis for retrofit cable design is presented. Finite element modeling and experimentation in this paper verify and validate the applicability of the model. Finally, a framework for developing a procedure for retrofit cable design is presented.

show abstract

Section: Introductionmentioning

confidence: 99%

A Modified Catenary Model with Application to the Analysis and Design of Retrofit Cables for Progressive Collapse

2018

View full text Add to dashboard Cite

show abstract

“…Finally it should be pointed out that, as the tests were carried out using 2D beam-column subassemblages, the 3D effects of transverse frames and floor slabs could not be considered in this study, which can provide significant resistance against progressive collapse as pointed out by Qian et al (2015). Also the dynamic effect caused by sudden removal of a column could not be considered in this study of static loading tests.…”

Section: Resultsmentioning

confidence: 98%

“…In Qian and Li (2013) experimental study of seven one-third scale RC beam-column substructures were tested to investigate the effect of beam transverse reinforcement ratios, type of design detailing, and beam span aspect ratios. Recently Qian et al (2015) tested 6 one-quarter scaled specimens to investigate the progressive collapse resisting capacity of RC frames including secondary mechanisms such as membrane actions developed in slabs. Kang et al (2015) carried out experimental investigation on the behavior of precast concrete beam-column sub-assemblages with engineered cementitious composites (ECC) in structural topping and beam-column joints under middle column removal scenarios to investigate the effectiveness of ECC on mitigating progressive collapse.…”

Section: Introductionmentioning

confidence: 99%

Monotonic Loading Tests of RC Beam-Column Subassemblage Strengthened to Prevent Progressive Collapse

Kim

Choi

2015

International Journal of Concrete Structures and Materials

View full text Add to dashboard Cite

In this study the progressive collapse resisting capacity of a RC beam-column subassemblage with and without strengthening was investigated. Total of five specimens were tested; two unreinforced specimens, the one designed as gravity loadresisting system and the other as seismic load-resisting system, and three specimens reinforced with: (i) bonded strand, (ii) unbonded strand, and (iii) side steel plates with stud bolts. The two-span subassemblages were designed as part of an eight-story RC building. Monotonically increasing load was applied at the middle column of the specimens and the force-displacement relationships were plotted. It was observed that the gravity load-resisting specimen failed by fractures of re-bars in the beams. In the other specimens no failure was observed until the maximum displacement capacity of the actuator was reached. Highest strength was observed in the structure with unbonded strand. The test result of the specimen with side steel plates in beam-column joints showed that the force-displacement curve increased without fracture of re-bars. Based on the test results it was concluded that the progressive collapse resisting capacity of a RC frame could be significantly enhanced using unbonded strands or side plates with stud bolts.

show abstract

“…For different seismic fortification intensities, it was noted that the load versus displacement curves exhibited similar characteristics, and the more stringent seismic design and detailing increased the failure displacement and the ultimate load. There have been reports of studies that have analyzed progressive collapse behavior of RC frames or beam-slab substructures by experiments or numerical analyses (Mehrdad et al 2007;Pham and Tan 2013a, b;Pachenari and Keramati 2014;Qian et al 2015). It was found that tensile membrane actions in slabs that inevitably develop in large deformation stage play a key role in its collapse resistance.…”

Section: Introductionmentioning

confidence: 99%

Progressive Collapse Resistance of RC Frames under a Side Column Removal Scenario: The Mechanism Explained

Hou

2016

Int J Concr Struct Mater

View full text Add to dashboard Cite

Progressive collapse resistance of RC buildings can be analyzed by considering column loss scenarios. Using finite element analysis and a static test, the progressive collapse process of a RC frame under monotonic vertical displacement of a side column was investigated, simulating a column removal scenario. A single-story 1/3 scale RC frame that comprises two spans and two bays was tested and computed, and downward displacement of a side column was placed until failure. Our study offers insight into the failure modes and progressive collapse behavior of a RC frame. It has been noted that the damage of structural members (beams and slabs) occurs only in the bay where the removal side column is located. Greater catenary action and tensile membrane action are mobilized in the frame beams and slabs, respectively, at large deformations, but they mainly happen in the direction where the frame beams and slabs are laterally restrained. Based on the experimental and computational results, the mechanism of progressive collapse resistance of RC frames at different stages was discussed further. With large deformations, a simplified calculation method for catenary action and tensile membrane action is proposed.

show abstract

Load-Carrying Mechanism to Resist Progressive Collapse of RC Buildings

Cited by 193 publications

References 11 publications

A Modified Catenary Model with Application to the Analysis and Design of Retrofit Cables for Progressive Collapse

A Modified Catenary Model with Application to the Analysis and Design of Retrofit Cables for Progressive Collapse

Monotonic Loading Tests of RC Beam-Column Subassemblage Strengthened to Prevent Progressive Collapse

Progressive Collapse Resistance of RC Frames under a Side Column Removal Scenario: The Mechanism Explained

Contact Info

Product

Resources

About