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Comparison of cable designs based on the distribution ratio between cable and beam of extra-dosed bridge(PDF)


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Comparison of cable designs based on the distribution ratio between cable and beam of extra-dosed bridge
Peng Jingrong1 He Shuanhai1 and Li Yao2
1) School of Highway, Chang’an University, Xi’an 710064, Shaanxi Province, P.R.China
2) CCCC First Highway Consultants Co.Ltd, Xi’an 710075, Shaanxi Province, P.R.China
bridge engineering extra-dosed bridge cable layout radial layout fan-shaped layout harp-shaped layout distribution ratio cable quantity
U 442;U 448.27
The formula of live load ratio between the cable and beam for the rigid system extra-dosed bridge is derived, and the concept of cable quantity is put forward for different cable layouts. For extra-dosed bridge, the larger the angle between cable and girder is (less than 54.74°), the more live load born by cables, so the ratio of radial layout is the maximum, then that of the fan-shaped layout, and the ratio of harp-shaped layout is the minimum. However, the length for three cable layouts is exactly opposite. Therefore, when the initial design of the extra-dosed bridge is completed, the most economical cable layout can be chosen based on the cable quantity. Finite element models of three cable layouts for an extra-dosed bridge are set up. The results show that in order to achieve the expected live load ratio between the cable and beam, the cable quantity for the radial cable layout is the least, followed by that of the fan-shaped layout which is 25% more than the cable quantity of the radial cable layout. The cable quantity of the harp-shaped layout is the most which is 81% more than that of the radial cable layout. The finite element analysis results are consistent with the calculated ones by the simplified formula with only a difference of 8%.


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Last Update: 2017-09-11