Protective and Blast Resistive Design of Posttensioned Box Girders Using Computational Geometry
The optimal tendon profile and its associated duct geometry for posttensioned box girders are investigated. A computational algorithm has been developed to determine an ideal shape for the tendon and duct. The algorithm is based on a diagonal cross point in the Magnel quadrilateral and uses computat...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/4932987 |
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| author | Majid Aleyaasin |
| author_facet | Majid Aleyaasin |
| author_sort | Majid Aleyaasin |
| collection | DOAJ |
| description | The optimal tendon profile and its associated duct geometry for posttensioned box girders are investigated. A computational algorithm has been developed to determine an ideal shape for the tendon and duct. The algorithm is based on a diagonal cross point in the Magnel quadrilateral and uses computational geometry instead of graphical drawing. Thereafter, an ideal parabolic and linear tendon profiles can be calculated from which the covering duct could be shaped. To check the optimality of the results, an automatic examination of Magnel diagrams in various cross sections is incorporated in the algorithm. This enables a unique prestress level to be selected that suits all sections. Then, the mideccentricity of the two crossing points with a common prestress line is chosen as a design eccentricity in each cross section. The optimal duct shape is determined based on such automatic inspections. In a numerical example, the linear, parabolic, and optimal duct geometries are compared and drawn. It is concluded that both linear and parabolic duct shapes can be very close to an optimal shape. In a numerical example, an optimal, box girder with linear open access-type tendons is designed that can withstand extra blast load when explosion occurs. |
| format | Article |
| id | doaj-art-27bb23bb96454d479bcfc2b7073d7026 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-27bb23bb96454d479bcfc2b7073d70262025-02-03T05:47:35ZengWileyAdvances in Civil Engineering1687-80861687-80942018-01-01201810.1155/2018/49329874932987Protective and Blast Resistive Design of Posttensioned Box Girders Using Computational GeometryMajid Aleyaasin0School of Engineering, University of Aberdeen, Fraser Noble Building, Aberdeen AB24 3UE, UKThe optimal tendon profile and its associated duct geometry for posttensioned box girders are investigated. A computational algorithm has been developed to determine an ideal shape for the tendon and duct. The algorithm is based on a diagonal cross point in the Magnel quadrilateral and uses computational geometry instead of graphical drawing. Thereafter, an ideal parabolic and linear tendon profiles can be calculated from which the covering duct could be shaped. To check the optimality of the results, an automatic examination of Magnel diagrams in various cross sections is incorporated in the algorithm. This enables a unique prestress level to be selected that suits all sections. Then, the mideccentricity of the two crossing points with a common prestress line is chosen as a design eccentricity in each cross section. The optimal duct shape is determined based on such automatic inspections. In a numerical example, the linear, parabolic, and optimal duct geometries are compared and drawn. It is concluded that both linear and parabolic duct shapes can be very close to an optimal shape. In a numerical example, an optimal, box girder with linear open access-type tendons is designed that can withstand extra blast load when explosion occurs.http://dx.doi.org/10.1155/2018/4932987 |
| spellingShingle | Majid Aleyaasin Protective and Blast Resistive Design of Posttensioned Box Girders Using Computational Geometry Advances in Civil Engineering |
| title | Protective and Blast Resistive Design of Posttensioned Box Girders Using Computational Geometry |
| title_full | Protective and Blast Resistive Design of Posttensioned Box Girders Using Computational Geometry |
| title_fullStr | Protective and Blast Resistive Design of Posttensioned Box Girders Using Computational Geometry |
| title_full_unstemmed | Protective and Blast Resistive Design of Posttensioned Box Girders Using Computational Geometry |
| title_short | Protective and Blast Resistive Design of Posttensioned Box Girders Using Computational Geometry |
| title_sort | protective and blast resistive design of posttensioned box girders using computational geometry |
| url | http://dx.doi.org/10.1155/2018/4932987 |
| work_keys_str_mv | AT majidaleyaasin protectiveandblastresistivedesignofposttensionedboxgirdersusingcomputationalgeometry |