工程科学与技术2018，Vol.50Issue(3)：169-176,8.DOI:10.15961/j.jsuese.201800182
基于场地效应及场地位移的高原大桥落梁破坏研究
Study on Failure Mechanism of Girder Falling of Gaoyuan Bridge Based on Effect and Displacement of Site
摘要
Abstract
The reasons of main beam displacement and girder falling of a simply supported beam bridge are related to bridge structure as well as theeffect and displacement of site.In order to study the influence of effect and displacement of site in girder falling and to find the failure mechanism of Gaoyuan bridge,which was a simply supported beam bridge and had girder falling in "5?12" Wenchuan earthquake,a finite element model ABAQUS was employed to simulate the process.The results showed that the relative slipping between pier and main beam was greatly influenced by the local site condition and the slipping distance near river bank was larger than that far away;The weak degree of filed had an obvious influence on the seismic response of bridge,and the slipping distance was enhanced while the site became weaker.The span change and slipping distance increased with the increase of site displacement.When the base rock was identical,the span change of bridge and slipping distance was small and the ability of adapting toand the deforma-tion of each pier was better.The span change slowly decreased in direction of site displacement,and increased from first span to fourth span.The main reasons for longitudinal failure mechanism of girder falling of Gaoyuan bridge at second span was that the bridge was close to the epicenter and Longmen mountain central main fracture zone,where there exist the soft shale in the bedrock,the unfavor-able local site conditions,the poor stability of laminated rubber bearing,and the use of lateral block in bridge.关键词
高原大桥/场地效应/场地位移/落梁破坏机理/有限元Key words
Gaoyuan bridge/site effect/site displacement/failure mechanism of girder falling/finite element method分类
交通工程引用本文复制引用
李碧雄,廖桥,曾小灵,王燕鹏,彭博..基于场地效应及场地位移的高原大桥落梁破坏研究[J].工程科学与技术,2018,50(3):169-176,8.基金项目
国家自然科学基金面上资助项目(51678379) （51678379）
四川省学术带头人培养基金资助项目(川人社办发[2016]183-2) （川人社办发[2016]183-2）
