摘要
为研究多跨矮塔斜拉桥超高墩合理形式,以多跨矮塔斜拉桥超高墩为对象,综合对比分析超高墩结构布置形式和受力特点,按截面特性相似的原则提出双薄壁墩、单薄壁墩、组合式墩、叠合式墩四种适用于依托工程的超高墩形式。采用全桥有限元和理论方法,分析不同工况下主梁和桥墩关键截面的内力和墩顶位移、施工和成桥运营阶段的稳定性、E1地震作用下的动力及抗震性能。结果表明:四种方案均满足施工阶段和成桥运营阶段下的稳定性要求,双薄壁墩前三阶均为纵向失稳且稳定安全系数变化较小;在E1地震荷载作用下,双薄壁墩内力响应最小,但位移响应较大,单薄壁墩和叠合式墩与之相反,组合式墩则较均衡。考虑结构整体受力性能,建议多跨矮塔斜拉桥超高墩桥梁选用双薄壁墩或组合式墩。
In order to study the reasonable form of super high piers in multi span extradosed bridge,taking the super high piers of multi span extradosed bridges as the object,a comprehensive comparative analysis is conducted on the structural layout and stress characteristics of high piers.Based on the principle of similar cross-sectional characteristics,four types of super high piers suitable for supporting engineering are proposed,namely double thin-walled piers,single thin-walled piers,composite piers,and composite piers.Full bridge finite element and theoretical methods are used,analyze the internal forces and pier top displacement of the key sections of the main beam and bridge pier under different working conditions,the stability during construction and bridge operation,and the dynamic and seismic performance under E1 earthquake action.The results show that the four schemes all meet the stability requirements in the construction stage and the completed bridge operation stage.The first three stages of double thin-walled piers are longitudinal instability and the stability Factor of safety changes little;under the action of E1 seismic load,the internal force response of double thin-walled piers is the smallest,but the displacement response is larger.On the contrary,single thin-walled piers and composite piers are more balanced.Considering the overall mechanical performance of the structure,it is recommended to choose double thin-walled piers or composite piers for multi span super high pier bridges.
作者
苗建宝
刘亚文
张小亮
雷浪
MIAO Jianbao;LIU Yawen;ZHANG Xiaoliang;LEI Lang(Xian Highway Research Institute Co.,Ltd.,Xi’an 710065,China;Hunan University,Changsha 410082,China)
出处
《交通科技与经济》
2024年第1期57-63,共7页
Technology & Economy in Areas of Communications
基金
陕西省交通科技项目(20-40K)。
关键词
桥梁工程
超高墩
有限元分析
稳定性
抗震性能
bridge engineering
super high pier
finite element analysis
stability
seismic performance
