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A platform for research: civil engineering, architecture and urbanism
Crack Control for Ledges in Inverted 'T' Bent Caps
Inverted 'T' bent caps are used extensively in concrete highway bridges because they are aesthetically pleasing and offer a practical means to increase vertical clearance. The problem is that at service load unacceptable diagonal cracks frequently occur at the re-entrant corners between the cantilever ledges and the web. In order to control the diagonal cracks, an extensive three-phase investigation was carried out. The first phase was to predict the diagonal crack widths at the interior portions of the bent caps. A 2-D analytical model, called Compatibility-Aided Strut-and-Tie Model (CASTM), was developed. This model was calibrated by the test results of seven full-size 2-D test specimens. The second phase was to predict the diagonal crack widths at the end faces of the exterior portions of bent caps. In this phase the CASTM was extended to 3-D analysis, which was calibrated by the test results of ten 3-D specimens. In the third phase, two whole-bent-cap specimens were tested to determine the effective distribution width in the vicinity of an applied load on the ledge. Crack control methods for the interior spans and the exterior end faces were recommended.
Crack Control for Ledges in Inverted 'T' Bent Caps
Inverted 'T' bent caps are used extensively in concrete highway bridges because they are aesthetically pleasing and offer a practical means to increase vertical clearance. The problem is that at service load unacceptable diagonal cracks frequently occur at the re-entrant corners between the cantilever ledges and the web. In order to control the diagonal cracks, an extensive three-phase investigation was carried out. The first phase was to predict the diagonal crack widths at the interior portions of the bent caps. A 2-D analytical model, called Compatibility-Aided Strut-and-Tie Model (CASTM), was developed. This model was calibrated by the test results of seven full-size 2-D test specimens. The second phase was to predict the diagonal crack widths at the end faces of the exterior portions of bent caps. In this phase the CASTM was extended to 3-D analysis, which was calibrated by the test results of ten 3-D specimens. In the third phase, two whole-bent-cap specimens were tested to determine the effective distribution width in the vicinity of an applied load on the ledge. Crack control methods for the interior spans and the exterior end faces were recommended.
Crack Control for Ledges in Inverted 'T' Bent Caps
R. R. H. Zhu (author) / H. Dhonde (author) / T. T. C. Hsu (author)
2003
82 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Cracking , Caps(Supports) , Highway bridges , Ledges , Bridge design , Reinforced concrete , Bridge foundations , Columns(Supports) , Loads(Forces) , Struts , Tests , Reinforcements , Stresses , Specimens , Serviceability , Research programs , Texas , Inverted T bent caps
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