橋梁設(shè)計外文翻譯--荷蘭跨線高架橋(已改無錯字)
2023-07-05 13:35:45 本頁面
【正文】 s 216。 400 mm through the m wide Ushaped beams. This provided much concernwith respect to acmodating the eight prestressing cables, the shear forces that arise andthe soft steel reinforcement connected with this as a result of the bending of the tensiontrajectories through this deformation. The criterion for the maximum permissible stress (0,45f39?！甤k) was the guideline at this site. The Ushaped bridges were calculated with a finiteelement model in which such factors as, with a view to fatigue, the main pull in the concrete would not exceed the value of 0,5 f’39。ck. Pylon The pylon was calculated by means of dividing it into discrete bar elements in a finiteelementmodel. The horizontal struts, that can only bear pressive forces, were divided into springelements with the characteristic that they are inactive for an pulling load, so that it is a nonlinearcalculation. The horizontal struts (figs. 5 and 6) that fix the Ushaped bridge both in the longitudinal andin the cross direction, thus bear the longitudinal forces (primarily braking, starting and trackforces) and the cross forces (mainly thrust, centrifugal and wind forces). The horizontal struts prise four steel pipes 216。 508 mm with a wall thickness of 30 mm. The length varies from 1025 mm to 2285 mm. The brackets are constructed in such a waythat they are able only to bear pressive forces. The steel pipes provide support for concretebrackets at the base level of the bridge. This connection, that cannot absorb pull forces, isfitted with a conical dowel, a ‘seeker dowel’, that ensures that the support construction iscentred at all times, even when it is disengaged by a few millimetres from the connection tothe Ushaped bridge. The maximum pressive force that occurs in the most heavily loaded strut is 3020 kN. Themaximum cross force has been calculated at 248 kN. Guy cables At the pylon, the bridge is suspended with two groups of vertical guy cables. Three cables arefitted to each beam, which move as a group in relation to the axis of this support (fig. 5). Thecables are fed through the Ushaped beam and pylon via inbuilt steel conduits, with theanchorheads are supported to accurately horizontally positioned steel anchor plates. The cables are ‘Hiam cables’, posed of 253 strands 216。 7 mm, FeP 1670. Load on the cables: the six cables absorb a maximum reactive force of 20970 kN, 22% of whichis causedby the working load。 the most heavily loaded cable absorbs a maximum reactive force of 3880 kN。 the least heavily loaded cable absorbs a reactive force of 3070 kN. In the design of the cables, the following requirements were set: the maximum deformation due to the working load must be less than 1/800 part of theadjoining span。 collapse safety criteria。 f
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