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Collapse behaviour of micro-concrete box girders bridges

Wong, S. S-W. (1998). Collapse behaviour of micro-concrete box girders bridges. (Unpublished Doctoral thesis, City, University of London)


The behaviour of micro-concrete in shear has been studied. The experimental result from the shear tests was used to modify an established generalised yield criterion that could be applied to reinforced concrete and prestressed concrete slab elements. The elements form part of a model structure such as box girders in which micro concrete was used as the model material.

The generalised yield line considered stress resultants including transverse bending moment, in-plane normal forces and shear forces along the yield line. The modified yield expression was compared with available experimental results from the literature. Possible collapse mechanisms and local failure modes were studied.

The experimental work on shear included Mattock type push-off shear tests. They were conducted to evaluate the shear behaviour of micro-concrete comparing with the behaviour of normal concrete. Ultimate load tests were carried out on four concrete box girder models.

The first test model was to investigate the collapse behaviour of an internal web of a twin- cell simply supported concrete box beam. The second test was on a restrained single cell beam, designed to represent an outer cell of a multi-cell continuous box beam. The third test was on a twin-cell two span continuous prestressed concrete box beam. The final test was conducted on a multi-cell two span continuous reinforced concrete box girder.

The results predicted using the modified yield criterion were compared with those obtained from the experimental work.

The last chapter discussed the suitability of the method for predicting collapse loads was discussed and conclusions drawn.

Publication Type: Thesis (Doctoral)
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Departments: School of Science & Technology > Computer Science
School of Science & Technology > School of Science & Technology Doctoral Theses
Doctoral Theses
[thumbnail of Wong thesis 1998 PDF-A.pdf]
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