Determination Of The Form Of Intermediate Tower And Tower-Girder Connection Of Three-Tower And Two-Span Suspension Bridge Of The Left Branch Of Maanshan Changjiang River Highway Bridge

Maanshan Changjiang River Highway Bridge which connecting Maanshan and Chaohu cities has an important position in regional expressway network.The left branch of the main bridge,which is the largest and the most representative part of the project,is the key project to control investment and construction period. To meet the main channel oscillation,the bridge should be able to cover the possible range of the channel because the mainstream and the channel has been in incessant adjustment and change.By scheme comparison,the left branch finally select a new system of three-tower and two-span suspension bridge.Paper combined with the design work of the left branch, first introduces the research status of the new system at home and abroad,then discusses the theoretical basis and design criteria of this new system by contrasting the mechanical characteristics with two-tower suspension bridge and comes to the conclusion that its key control factor is the stiffness of the intermediate tower.After that,by changing the rise span ratio, the height, composition form and section types of the intermediate tower makes scheme comparison of different stiffness of intermediate tower And then results of deformation,internal force and stress etc.of different schemes are fully compared for drawing a conclusion that moderate stiffness of intermediate tower should be used.Finally,makes useful discussion to suitably select tower-girder connection of the left branch of Maanshan changjiang river highway bridge by comparing two schemes of consolidation and separation.