| As a result of CFST arch bridge reasonable stress performance and material superiority, CFST arch bridge is just unfolding in our country, the span is in constant breakthroughs, the type is in constant innovation and the technology is in the increasingly enhancement. But in giving full play to the performance of CFST arch bridge, there are many problems to be studied.Above all, this thesis discusses the situation of development about CFST arch bridge, on the basis, the generation and the characteristic of CFST" fly-bird-type" struss arch bridge were discussed, stressed characteristics of bridge structure and the calculation method which is about the horizontal thrust at arch feet under the dead load were expounded. The calculation method of the bridge seismic theory was summarized and the design idea and thought were introduced. Then, based on practical project——Tuojiang Sanqiao (fly-bird-type struss arch bridge),the research work about static and dynamic characteristic of CFST" fly-bird-type" struss arch bridge was developed.(1) With the principle of finite element method in the bridge, the space finite element model of the whole bridge is established through the Software of MIDAS-CIVIL, the static analysis, response spectrum analysis and time history analysis is given to the whole bridge.(2) Based on the static analysis of the whole bridge, calculated the internal force of the key parts in the main construction stages and calculated horizontal force at arch feet and displacement values around tensioning tied, then, the results were analyzed and summarized.(3) Based on the linear elastic stability analysis of the bridge, the instability modes and the characteristic value buckle safety factor were calculated under variety adverse load conditions and the results were analyzed and summarized.(4) From the current seismic thoughts, respectively according to different earthquake (El, E2earthquake), the elastic response spectrum analysis and dynamic time-history analysis were done for the bridge. According to the results of seismic response, the seismic performance of the bridge was evaluated. The basis data was provided for the further seismic design concept and the further and perfect seismic system about CFST arch bridge. |
