dc.contributor.advisor | Lu, Yong | en |
dc.contributor.advisor | Stratford, Timothy | en |
dc.contributor.author | Harry, Ofonime Akpan | en |
dc.date.accessioned | 2018-04-24T10:00:53Z | |
dc.date.available | 2018-04-24T10:00:53Z | |
dc.date.issued | 2018-07-04 | |
dc.identifier.uri | http://hdl.handle.net/1842/29623 | |
dc.description.abstract | A structure subjected to extreme load due to explosion or human error may lead to
progressive collapse. One of the direct methods specified by design guidelines for
assessing progressive collapse is the Alternate Load Path method which involves
removal of a structural member and analysing the structure to assess its potential of
bridging over the removed member without collapse. The use of this method in
assessing progressive collapse therefore requires that the vertical load resistance
function of the bridging beam assembly, which for a typical laterally restrained
reinforced concrete (RC) beams include flexural, compressive arching action and
catenary action, be accurately predicted.
In this thesis, a comprehensive study on a reliable prediction of the resistance function
for the bridging RC beam assemblies is conducted, with a particular focus on a) the
arching effect, and b) the catenary effect considering strength degradations. A critical
analysis of the effect of axial restraint, flexural reinforcement ratio and span-depth
ratio on compressive arching action are evaluated in quantitative terms. A more
detailed theoretical model for the prediction of load-displacement behaviour of RC
beam assemblies within the compressive arching response regime is presented. The
proposed model takes into account the compounding effect of bending and arching
from both the deformation and force points of view. Comparisons with experimental
results show good agreement.
Following the compressive arching action, catenary action can develop at a much
larger displacement regime, and this action could help address collapse. A complete
resistance function should adequately account for the catenary action as well as the
arching effect. To this end, a generic catenary model which takes into consideration
the strength degradation due to local failure events (e.g. rupture of bottom rebar or
fracture of a steel weld) and the eventual failure limit is proposed. The application of
the model in predicting the resistance function in beam assemblies with strength
degradations is discussed. The validity of the proposed model is checked against
predictions from finite element model and experimental tests. The result indicate that
strength degradation can be accurately captured by the model.
Finally, the above developed model framework is employed in investigative studies to
demonstrate the application of the resistance functions in a dynamic analysis
procedure, as well as the significance of the compressive arching effect and the
catenary action in the progressive collapse resistance in different designs. The
importance of an accurate prediction of the arching effect and the limiting
displacement for the catenary action is highlighted. | en |
dc.contributor.sponsor | other | en |
dc.language.iso | en | |
dc.publisher | The University of Edinburgh | en |
dc.relation.hasversion | Harry, O. A. and Lu, Y., 2016. “Effect of reinforcement detailing on progressive collapse resistance” 16th International Conference & Exhibition on Structural Faults & Repair. May 2016, Edinburgh, Scotland, United Kingdom. | en |
dc.relation.hasversion | Harry, O. A. and Lu, Y., 2017. “Progressive collapse-arching effect in reinforced concrete beams” CONFAB 2017: 2nd International Conference on Structural Safety under Fire & Blast Loading. September 2017, London, United Kingdom. | en |
dc.relation.hasversion | Cheng, X., Harry, O., Irvine, M., Jacobs, P. and Lu, Y., 2017. “Progressive collapse - a laboratory perspective of beam assemblies in a column loss scenario” CONFAB 2017: 2nd International Conference on Structural Safety under Fire & Blast Loading. September 2017, London, United Kingdom. | en |
dc.subject | Alternate Load Path | en |
dc.subject | progressive collapse | en |
dc.subject | compressive arching action | en |
dc.subject | catenary action | en |
dc.subject | reinforced concrete beams | en |
dc.subject | strength degradations | en |
dc.subject | load-displacement behaviour | en |
dc.subject | theoretical models | en |
dc.title | Behaviour of reinforced concrete frame structure against progressive collapse | en |
dc.type | Thesis or Dissertation | en |
dc.type.qualificationlevel | Doctoral | en |
dc.type.qualificationname | PhD Doctor of Philosophy | en |