Structure Analysis Of Aluminum Alloy Pedestrian Bridge

Aluminium alloy is widely used in automobile,building and many other fields today for its high elastic modulus and prevention of corrosion. Aluminium was first used on bridge as deck in USA in 1933.And now,the use of aluminium on bridge has well developed in many developed countries,otherwise,the study of it is just on start internally.And the pedestrian overcrossing,Qingchun Rd. bridge,has been built in 2006 is the first one with aluminium wholly in our country.Compared with common steel bridge and steel-concrete bridge,aluminium alloy one is different so much as the new kind of bridge.First of all,the sole weight of it is small because of its small density. And the second,the elastic modulus of it is smaller than steel.In respect that Qingchun Rd. bridge is the first one made of aluminium wholly in our country,there is no existed epxperience for us to utilize and technologies is not mature,and many problems appeared at the step of design and install,such as large deflection with full load,frequency will follow load change,problem of stability out of plane on the structure,the disability of ultimate load-carrying capacity of bridge to satisfy the safety of the design,and so on. The paper studies the problems,analysis the essential reasons,and offer the scheme to slove them.Finite element softwares(ANSYS and MIDAS) are used to calculate the ultimate load,carrying capacity of the bridge under live load,wind load and some other types of loads.The paper gives an overall analysis to aluminium alloy bridge and takes a further study in design and construction of it.And the paper looks forward to giving some advices for the use of aluminium alloy bridge in our country in the future.