| Owning to its strong adaptability, easy construction, small investment, high efficiency and good aseismic performance, continuous rigid frame bridge becomes one of the manly used bridge types along with the continuous improvement of the construction technology. China is one of the world’s most earthquake-prone countries, facing the Pacific Ring of seismic belt to their west and the Eurasian seismic belt to the east. As the hub of transportation, the large span bridges involve huge investment and have a profound effect on the national economy. Therefore, studying the static and dynamic characteristics of large span bridges and taking reasonable and effective anti-seismic measures to ensure their safety in the earthquake have very important social and economic significance. Taking the Wan-la-mu Bridge in the Lijiang-Xianggelira Raiway as engineering background, the dynamic characteristics and seismic response were analyzed using the combination of the response spectrum analysis and time history analysis method. The main works include:1. On the base of many researches at home and abroad, this study introduced the development profiles and features of continuous rigid frame bridge, as well as seismic design process and the corresponding influencing factors through a number of typical continuous rigid frame bridges.2. The conventional design and static analysis of Wan-la-mu Bridge was introduced and the characteristics of this type bridges were summarized.3. Based on the dynamic analysis and related theory, the response analysis of Wang-la-mu Bridge under frequent and rare earthquake was carried out employing the response spectrum analysis and time history analysis method together. Besides, the most unfavorable sections of the bridge pile and foundation were investigated, and the results show that the bridge is safe in high intensity zone. Furthermore, this study can provide reference for anti-seismic calculation and analysis of this type of bridges. |
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