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The response of flat slab-column connections of reinforced concrete to high-cycle lateral motion of low amplitude
Thesis (Ph. D. (Civil Eng.)) -- University of Stellenbosch, 1990.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : Stellenbosch University
2012
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| _version_ | 1867613948188033024 |
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| access_status_str | Open Access |
| author | Dunaiski, Peter Ernst |
| author2 | Louw, J. M. |
| author_browse | Dunaiski, Peter Ernst Louw, J. M. |
| author_facet | Louw, J. M. Dunaiski, Peter Ernst |
| author_sort | Dunaiski, Peter Ernst |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (Ph. D. (Civil Eng.)) -- University of Stellenbosch, 1990. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/69035 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:44:15.221Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2012 |
| publishDateRange | 2012 |
| publishDateSort | 2012 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/69035 The response of flat slab-column connections of reinforced concrete to high-cycle lateral motion of low amplitude Dunaiski, Peter Ernst Louw, J. M. Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering. Concrete construction -- Joints -- Testing Concrete slabs -- Testing Reinforced concrete construction Dissertations -- Civil engineering Thesis (Ph. D. (Civil Eng.)) -- University of Stellenbosch, 1990. The objective of the investigation was to study the response of interior flat slab-column connections of reinforced concrete subjected to low-amplitude high-cycle dynamic loadings caused by lateral motion. Nineteen specimens were tested, twelve were tested statically and seven were tested dynamically. The concrete mix and the dimensions of the isolated slab-column connections were kept the same for all test specimens. No shear reinforcement was used. The main variables were the reinforcement ratio in the slab and the vertically imposed slab load simulating gravity loads and causing a balanced moment in the slab without moment transfer between slab and column. For the statically tested specimens a horizontal load was applied to the top of the column causing an unbalanced moment in the slab and moment transfer between column and slab. The specimens were tested to failure by increasing the horizontal load. The mode of failure was in flexure, but the specimens with a higher reinforcement ratio developed an inclined shear crack after the longitudinal steel had yielded causing a secondary shear failure. The low-amplitude high-cycle load was applied in the form of a sinusoidal horizontal support motion with a constant amplitude for 10 million loading cycles with a forced frequency of 6,5 Hz which was just above the natural frequency of the test specimens. The unbalanced moment in the slab was caused by the inertia of a lead mass of 1200 kg at the top of the column. All seven dynamically tested specimens survived the 10 million loading cycles and were tested statically to failure. The mode of failure and the crack pattern were identical for corresponding specimens from both test series. The formation of a dominant flexural crack close to the face of the column extending towards the free edges of the slab suggests a flexural behaviour of the slab when subjected to the unbalanced moments. Together with the observed distribution of the compressive strain in the concrete, this failure mode was used as a basis for the development of a computational model to calculate the stress in the longitudinal reinforcement. The calculated and experimentally determined stresses in the reinforcement for the statically tested specimen compared well. This analytical model was used to calculate the stress in the reinforcement of the dynamically tested specimen. High stress ranges were found to occur in the reinforcement during the cyclic loading without a failure in the reinforcement due to fatigue during the repeat load test. For the selected set of experimental parameters the possibility of a shear failure due to the combination of gravity loads and dynamic horizontal loads can be ruled out. Doctoral 2012-08-27T12:26:53Z 2012-08-27T12:26:53Z 1990 Thesis http://hdl.handle.net/10019.1/69035 en Stellenbosch University 300 pages : ill. application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Concrete construction -- Joints -- Testing Concrete slabs -- Testing Reinforced concrete construction Dissertations -- Civil engineering Dunaiski, Peter Ernst The response of flat slab-column connections of reinforced concrete to high-cycle lateral motion of low amplitude |
| title | The response of flat slab-column connections of reinforced concrete to high-cycle lateral motion of low amplitude |
| title_full | The response of flat slab-column connections of reinforced concrete to high-cycle lateral motion of low amplitude |
| title_fullStr | The response of flat slab-column connections of reinforced concrete to high-cycle lateral motion of low amplitude |
| title_full_unstemmed | The response of flat slab-column connections of reinforced concrete to high-cycle lateral motion of low amplitude |
| title_short | The response of flat slab-column connections of reinforced concrete to high-cycle lateral motion of low amplitude |
| title_sort | response of flat slab column connections of reinforced concrete to high cycle lateral motion of low amplitude |
| topic | Concrete construction -- Joints -- Testing Concrete slabs -- Testing Reinforced concrete construction Dissertations -- Civil engineering |
| url | http://hdl.handle.net/10019.1/69035 |
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