桥梁设计外文翻译资料--超轻大跨度桥-桥梁设计(编辑修改稿)

桥梁设计外文翻译资料--超轻大跨度桥-桥梁设计(编辑修改稿)内容摘要：

eveloped by NRS. The cycle for construction of each 5m wide bridge segment is a week, and two mobile units are being used on the Sundoya Bridge. These particular units were built for AS Anlegg to use on the Varodden Bridge in Kristiansand in Norway, and they have also been used by the same contractor on the Rafsundet Bridge. The design of the central part of the main span of the bridge is based on the use of lightweight concrete LC60 while other parts of the structure use the more standard type C65. Because of the aggressive marine environment, the quality of the concrete must be particularly good. The structure is a single cell, prestressed rectangular box girder, largely built using the travelling formwork system from NRS. The box width is 7m and its depth varies from 3m at the centre of the span to over the piers. Close to the abutments, concrete of quality C25 will be used inside the box girder as ballast. In addition, the designers have included the necessary elements inside the box girder in order to allow the possible addition of posttensioning cables in the future. The longterm behaviour of such large spans is not fully known, so the possibility that the main span may sag over time has to be taken into account. The width of the road is a constant from the barrier on one side to that on the other, and the total width of the bridge is some . There is a 2m wide footway included in the width of the structure. The pier shaft is formed with twin legs, which are hollow inside. The pier shafts incorporate permanent prestressing cables and they have a constant wall thickness and a width that varies parabolically over their height. Temporary tiedown piers are used to construct the bridge they are located 35m into each 120mlong side span from the main piers. Each consists of an Ishaped shaft, which is tied down to the ground using rock anchors and connected to the box girder by means of prestressing cables. The purpose of these structural elements is to support the cantilever and prevent rotation in strong winds. Once the brid。