Use this URL to cite or link to this record in EThOS:
Title: Modelling the collapse behaviour of reinforced concrete slabs
Author: Jackson, Andrew Mark
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2011
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Restricted access.
Access from Institution:
This thesis presents a new method for predicting the load at which a general reinforced concrete slab will collapse in flexure. The new method is referred to as ‘combined lower and upper bound plastic analysis’ and is particularly suited to the assessment of existing concrete slabs such as bridges. The new technique consists of a lower bound method and an upper bound method. The lower bound method uses an equilibrium mesh with mathematical programming and iterative refinement techniques. Unlike many previous methods, it rigorously applies the lower bound theorem of plasticity, so it is guaranteed to produce safe underestimate of the theoretical plastic collapse load. It can be applied to real slabs with complicated geometries, loads and reinforcement layouts. The upper bound method uses the results of the lower bound method to help an engineer identify a suitable approximate collapse mechanism. This mechanism is then optimised and used to identify an upper bound to the collapse load. When applied to a range of example slabs, combined lower and upper bound plastic analysis consistently produces lower and upper bounds to the collapse load that are separated by a few percent, showing that they are highly accurate. Unlike other advanced methods, it produces simple results that engineers can easily check. The new method produces good predictions of collapse loads measured in laboratory experiments, although care must be taken to ensure that it is only applied to cases where the assumptions made by plastic flexural analysis are valid.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available