Research On Detailed Analysis Of Slab Bridge With Finite Element Method

The slab bridge is a novel bridge style. It substitutes the flexible cable with the prestressed concrete rigid slab. Compared with the traditional cable-stayed bridge, it has a great deal of advantages in such aspects as the cable's preservation, fatigue and vibration. The first long-span slab bridge in the world is the Ganter Bridge in Switzerland built in 1980.The concrete's creep is an important part in concrete bridge's structure design. The concrete's crack may lead to the damage of service performance and duration of engineering structure. With the developmen of computer technology, the nility mechanics behavior of reinforced concrete before and after crack can be analyzed with finite element method. The paper introduces the usage of analysis of concrete creep by effective modulus method thesis and modeling of crack by crack element.Based on the project background of the slab bridge with single-tower and single-slab, Shaxi Bridge in Panyu, Guangdong, China, the paper presents in detail the process of building up the integrated finite element thesis model for the bridge by ALGOR, a general FEM software. It studies on the effect of mechanics behavior in all construction phases and completed bridge stage under various loads. It discusses the effect of concrete's shrinkage, creep, crack, changes of global temperature, local temperature and four-type live load on Shaxi Bridge.Finally, it can be concluded that the construction process of Shaxi Bridge is reasonable, and that the influence of shrinkage, creep and temperature load on the prestressed concrete slab bridge is obvious. It is showed that the calculation result using FEM and the actual damage phenomenon fit well.