摘要
以福州市部分桥梁的抗震安全性评估为基础,对混凝土空心板梁桥的抗震薄弱环节进行易损性研究。针对混凝土空心板梁桥的技术参数、性能指标,构建有限元模型,采用增量动力分析(IDA)方法对桥梁结构易损性曲线的形成过程进行探讨;对各级损伤状态下桥墩墩柱、盖梁支座、桥台支座的易损性曲线进行对比分析;探究各构件在地震作用下的损伤规律。研究发现:地震状态下,当桥墩墩柱的高度较低、箍筋配筋率较小、墩柱的延性能力较差时,桥墩墩柱是桥梁结构最易损伤的部位;由于桥台的延性比桥墩小得多,因此桥墩墩柱和盖梁支座共同承担了地震力,桥墩的变形消耗了一部分能量,故桥台支座比盖梁支座更容易受到破坏。
Based on the seismic safety assessment of some bridges in Fuzhou, China, the vulnerability is studied on a weak link of seismic resistance called concrete hollow slab girder bridge. According to the technological paramaters and performance indexes of the concrete hollow slab girder bridge, its finite element model is built, and the formation process of the vulnerability curve of the bridge structure is discussed by using the Incremental Dynamic Analysis(IDA) method. The vulnerability curves of the pier column, the cap beam support and the abutment support are compared and analyzed under different damage states. The damage rule of each component under the seismic is investigated. It is found that: under the seismic, when the height of the pier column is low, the ratio of stirrup reinforcement is small, and the ductility ability of the pier column is poor, the pier column is the most vulnerable part of bridge structure;because the ductility of abutment is much smaller than that of the pier, the pier column and the cap beam bearing bear the same seismic force, and the deformation of pier consumes a part of energy, thus abutment bearing is more susceptible to damage than the cap beam.
作者
吴建臻
WU Jian-zhen(Jinshan College of Fujian Agricultural and Forestry University,Fuzhou 350002,China)
出处
《工业技术创新》
2020年第3期42-45,51,共5页
Industrial Technology Innovation
关键词
混凝土空心板梁桥
地震易损性
抗震安全性评估
易损性曲线
增量动力分析(IDA)
Concrete Hollow Slab Girder Bridge
Seismic Vulnerability
Seismic Safety Assessment
Vulnerability Curve
Incremental Dynamic Analysis(IDA)
