%0 Journal Article
%T 独塔部分斜拉桥顺桥向地面运动作用下的易损性分析<br>Seismic fragility analysis on extra-dosed PC bridge with single-tower under the motion of longitudinal bridge direction
%A 吴少峰
%A 上官萍
%A 姜绍飞
%J 福州大学学报(自然科学版)
%D 2017
%R 10.7631/issn.1000-2243.2017.02.159
%X 以墩塔梁固结的独塔预应力混凝土部分斜拉桥为对象，采用动力增量法和数据统计分析研究该类桥梁的地震易损性，确定顺桥向地面运动作用下结构构件的易损部位及损伤破坏概率. 采用理论易损性分析方法，选取地面峰值加速度作为地震输入强度指标，并以放大系数为基础选取地震输入；以位移延性比、强度与变形、相对位移、索力为指标分别定义了各构件的损伤状态；根据各构件的损伤概率，拟合建立了各构件及全桥的易损性曲线. 结果表明，在顺桥向地面运动作用下，中墩和支座为最易损构件；边墩、主梁均会发生不同程度的损伤；斜拉索、桥塔、桩基安全储备较高.<br>The PC cable-stayed bridge with a single tower rigidly connected with the girder was selected as the object of the research. The dynamic increment method and data statistical analysis method were used to study the seismic vulnerability for bridge of this kind. The vulnerable elements and the corresponding damage probability were ensured under the ground motion in longitudinal bridge direction. The peak acceleration of ground motion was chosen as the intensity index input of the earthquake records with the use of vulnerability analysis theory and earthquake input was selected by the amplification coefficient. Damage status for each component was defined with the index of displacement ductility ratio，strength and deformation，relative displacement and the cable force. The vulnerability curve for the component and the whole bridge were established based on the damage probability. Results shows that the middle pier and the bearing were the most vulnerable part under the ground motion in longitudinal bridge direction，the side pier and the girder showed a damage at different degree and the cables，bridge tower and the piles showed a high safety storage
%K 独塔部分斜拉桥 地面运动 地震易损性 易损性曲线 损伤极限状态&lt
%K br&gt
%K extra-dosed PC bridge with single-tower ground motion seismic vulnerability fragility curve fullest damage extent
%U http://xbzrb.fzu.edu.cn/ch/reader/view_abstract.aspx?file_no=201702002&flag=1