Seismic Response Analysis Of Long Span CFST Arch Bridges Consider Material Nonlinear

In recent years,our country economy stability increases and the scientific technology develops quickly,more investment is put into the fundamental facilities,we accomplish a lot of great construction of bridges and a large improvement also be made in bridge construction technology.With the high capacity,strong spanning ability,good seismic behavior and convenience of construction,Concrete-filled steel tubular (CFST) arch bridge develops rapidly and is a quickest-developing structure of bridge, which was built since 1990.With the continuous development and mature of CFST structural theory, CFST arch bridge are developing in the direction of more large-span and more large scale.At the same time,the application area and range are expanding continuously, and the largest span of CFST arch bridge which have been built has exceeded 450m at the present time.With the adaptable of CFST arch bridge's rapid developing,much favorable work has been done about the theory of research of CFST arch bridge,but these fall behind its development.As China is a country with earthquakes often-occurred, under the present conditions that CFST arch bridges have been widely used, studying on the seismic behavior is very necessary and urgent. Now the earthquake-resistant theoretical research on CFST arch bridges is in the beginning. Systematic design program has not been constructed and no specialized design specification exists. The knowledge about CFST arch bridges' seismic behavior is very limited. Therefore, studying on the seismic behavior of CFST arch bridges is very necessary.To research Seismic Response Consider Material Nonlinear on CFST arch bridges and change the condition of theoretical research below the project practice, this article around its basic dynamic characteristics and 3D-spatial elastic-plastic time history reactions, main works done are as follows.1.On the basis of the structure's material nonlinear, adoption of a unified theory, Establish finite model of long span CFST arch bridges. Carrying out the dynamic characteristics analysis of CFST arch bridge.model, calculator its dynamic characteristics. laying a foundation for further research on the CFST arch bridges' dynamic characteristics.2. Discussing the seismic spectrum analysis of this CFST arch bridge.model With geographic conditions of the bridge and available specification of Earthquake Resistant Design for Highway engineering, the thesis created the seismic spectrum curve of the spot. On the basis of the curve, the displacement and force are introduced under the seismic effect.3. With the method of 3D-spatial time history analysis, the thesis analyzed the seismic behavior of some CFST arch bridge in practical project of high-intensive district, and focusing on the influence of traveling wave effect to this CFST arch bridge. Providing and perfecting the basic materials for determination of seismic design concept and construction of seismic design systems in CFST arch bridges.4. According to resists earthquakes the analysis result to put forward some valuable project proposals.