Alsayed, Motasem (2019) Behaviour of Partially Earth-anchored Cable-stayed Bridge with Crossing Cables of Different Side-to-Main Span Ratios. Masters thesis, Concordia University.
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Abstract
Maximising the main span length of cable-stayed bridges while optimizing the cost of construction is a bridge engineering challenge. One solution has been suggested by Shao et al. (2014) who proposed a partially-earth anchored system in conjunction with crossing cables at the main span as a new system for cable-stayed bridges. The main span length tested in their study was 1408 meters, which is much longer than existing conventionally constructed bridges. Although analysis results demonstrated that the proposed system has advantages over conventional systems, it is still under development and has not been adopted in practice.
The purpose of this study therefore is to evaluate the structural response of a cable-stayed bridge under the proposed new system of different side-to-main span ratios. The bridge considered in Shao et al. (2014) is used for analysis. Six side-to-main span ratios, i.e., 0.24, 0.27, 0.30, 0.33, 0.36 and 0.39, are tested. Three-dimensional finite element models are developed using structural analysis software SAP2000. The models are subjected to dead load, traffic load, and earthquake load to test the response of the bridge’s superstructure and substructure.
From this study it is found that under static loads the side-to-main span ratios have a significant effect on girder axial force and anchorage, while having a very minor effect on cables. The results also show that the ratio does not affect the bending moment of the main span, but that when a small ratio is considered particular attention needs to be paid to the pier farther from pylon to avoid uplifting. Deck vibration and longitudinal movement, as well as pylon lateral displacement, would not be an issue for this super-long bridge. However, it might be necessary to take appropriate action to allay concerns over residual displacement due to earthquake load.
| Divisions: | Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering |
|---|---|
| Item Type: | Thesis (Masters) |
| Authors: | Alsayed, Motasem |
| Institution: | Concordia University |
| Degree Name: | M.A. Sc. |
| Program: | Civil Engineering |
| Date: | 7 November 2019 |
| Thesis Supervisor(s): | Lin, Lan and Hassan, Jassim |
| Keywords: | Cable-stayed bridge, Partially earth-anchored system, crossing cables, side-to-main span ratio |
| ID Code: | 986169 |
| Deposited By: | Mo'tasem Alsayed |
| Deposited On: | 25 Jun 2020 19:51 |
| Last Modified: | 25 Jun 2020 19:51 |
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