城市混凝土連續(xù)箱梁高架橋地震易損性調(diào)查與分析
[Abstract]:In recent years, with the development of China's social economy, the process of urbanization is accelerating, and the construction of various elevated express transportation networks is also increasing. As the lifeline engineering of the city, if the bridge is seriously damaged in the earthquake, it will cause great difficulties in the disaster relief work after the earthquake, resulting in huge economic losses. Due to the passage of time, the seismic performance of the existing urban viaducts is reduced, and the new urban bridge code is issued, which puts forward new requirements for the seismic performance of urban viaducts. It is necessary to evaluate the seismic performance of these bridges and take appropriate seismic reinforcement measures. Based on the investigation of Fuzhou City concrete viaduct, the earthquake damage of the bridge is predicted by means of empirical statistics. Then, based on the investigation, the theoretical vulnerability analysis of the bridge components and the whole bridge subjected to the seismic excitation in the direction of the bridge and the transverse direction is carried out. The main contents are as follows: (1) the characteristics of earthquake damage of bridges and the development of seismic vulnerability of bridge structures are summarized, and the problem of seismic wave input and the determination of damage index are discussed. It provides a theoretical basis for the determination of damage index and the establishment of vulnerability curve. (2) the investigation of urban concrete viaducts on main roads and expressways in Fuzhou is carried out, and the relevant information is counted. The main points of establishing dynamic model of concrete viaduct and the establishment of seismic vulnerability curve in forward direction of reference bridge are introduced in detail by means of empirical statistical method. (3) the main points of establishing dynamic model of concrete viaduct are introduced in detail. The comparison between the Code for Seismic Design of Urban Bridges (CJJ166-2011) and the rules for Seismic Design of Highway Bridges (JTG/TB02-01-2008) and the comparison of the vulnerability of bridges under different specifications are made. (4) the seismic vulnerability of urban concrete continuous box girder viaducts is analyzed. The effects of pier height, span and slope on the vulnerability of the most unfavorable components of bridges, such as plate rubber bearings, basin sliding supports, basin fixed supports and fixed piers, are discussed. And the influence on the vulnerability of the whole and the whole bridge. (5) comparing the vertical and transverse viaduct vulnerability curves of each component of the reference bridge, and discussing the pier height under the transverse earthquake of the city concrete continuous box girder viaduct bridge. The influence of span and slope on the vulnerability of the most unfavorable components of the bridge, such as the plate rubber bearing, the basin sliding support, the basin fixed support and the fixed pier, as well as the overall vulnerability of the whole bridge. Through the comparison and analysis above, the corresponding laws and conclusions can be obtained, which can provide some basis for the seismic reinforcement of the bridge.
【學位授予單位】:福州大學
【學位級別】:碩士
【學位授予年份】:2014
【分類號】:U442.55
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