自锚式斜拉-悬索协作体系桥的方案设计

Conceptual Design of Self-Anchored Cable-Stayed Suspension Bridge

目前斜拉-悬索协作体系桥梁主要停留在方案设计阶段,所提出的方案,均为地锚体系。针对大连跨海大桥,提出(263+800+263)m的自锚式斜拉-悬索协作体系桥方案,该方案桥型为双塔双索面,塔墩固结,塔梁分离,主梁为混合梁,斜拉区为混凝土箱梁,悬吊区为钢箱梁。该桥型兼备斜拉桥和自锚式悬索桥的优点,具有结构新颖、受力合理、抗风性能好和工程造价低等特点。对该桥提出了初步施工方案,即先进行斜拉桥部分的悬臂施工,然后将主缆锚固于临时地锚吊装悬索段主梁。

Presently, the cable-stayed suspension bridge still stays in the stage of conceptual design and all proposals made for the design of such type of the bridge are of ground anchored system. For the design of the Dalian Sea-Crossing Bridge to be built, a self-anchored cable-stayed suspension bridge with span arrangement （263＋800＋263） m is proposed. As it is designed, the Bridge is provided with double pylons and double cable planes, the pylons and the piers are rigidly fixed, the pylons and the main girder are separated and the girder is a hybrid one made up of con- crete and steel. In the cable-stayed part, the girder is a concrete box one while in the suspension part, the girder is a steel box one. The Bridge concurrently has the advantages of the cable-stayed bridge and the self-anchored suspension bridge and the structure of the Bridge is novel, the me- chanical behavior is rational, the wind-resistant performance is good and the construction cost is low. Meanwhile, the teotative construction schemes for the Bridge are proposed as well, that is, the cantilever construction of the cable-stayed part of the Bridge will be carried out first, the main cables will be anchored to the temporary ground anchorage and the main girder for the suspension part will be then lifted and installed.