摘要
以跨深汕西高速公路新建广州至汕尾铁路大桥为研究对象,应用Midas Civil软件建立全桥分析模型,分析采用上塔柱分散锚固、塔顶集中锚固的抛物线和圆曲线桥塔的受力,进行桥塔形式和锚固构造研究。结果表明:不同塔型轴力基本相当,弯矩差异较大,集中锚固时最大弯矩为塔顶正弯矩,分散锚固时最大弯矩为塔顶负弯矩,且抛物线和圆曲线桥塔采用分散锚固时的最大弯矩数值分别为采用集中锚固时的9.7和1.8倍;抛物线拱形塔采用上塔区分散锚固形式更为适宜,受力状态更好;圆曲线拱形塔采用塔顶集中锚固或上塔区分散锚固形式均合适,当圆曲线拱形塔采用塔顶集中锚固时,塔间设置横向索可有效改善桥塔变形和内力状态;桥塔形式可结合建桥条件和受力要求进行选择;塔顶集束式锚固构造传力途径明确,结构受力合理,技术可行。
Taking the newly-built bridge of Guangzhou-Shanwei High-Speed Railway spanning Shenzhen-Shantou West Expressway as the research object,Midas Civil software was used to establish the analysis model of the full-bridge.The forces of the parabolic and circular arch pylons with scattered anchorage on upper column and concentrated anchorage at top pylon were analyzed to study the pylon form and anchorage structure.The results show that the axial forces of different pylon forms are basically the same,while the bending moments differ greatly.The maximum bending moments under the conditions of concentrated anchorage and scattered anchorage are both located at top pylon and the former is positive while the latter is negative.Besides,the maximum bending moment values of parabolic and circular arch pylons with scattered anchorage are 9.7 and 1.8 times of those with concentrated anchorage respectively.A conclusion can be reached that the scattered anchorage on upper pylon is more applicable to parabolic arch pylon,which shows better stress state.The concentrated anchorage at top pylon and the scattered anchorage on upper pylon are both suitable for circular arch pylon.When concentrated anchorage at top pylon is applied to circular arch pylon,the deformation and stress state of pylon can be improved with installing transverse cable between pylons.And the pylon form can be selected according to the bridge construction conditions and stress requirements.The cluster anchorage structure at top pylon shows the advantages of clear force transmission,proper stress state and technical feasibility.
作者
李浩
LI Hao(China Railway Guangzhou Group Co.,Ltd.,Guangzhou Guangdong 510088,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2022年第1期85-91,共7页
China Railway Science
基金
中国铁路广州局集团有限公司科技研究开发计划项目(2020K039-G)。
关键词
高速铁路
拱承斜拉桥
抛物线拱形塔
圆曲线拱形塔
集束式锚固构造
High-speed railway
Arch supported cable-stayed bridge
Parabolic arch pylon
Circular arch pylon
Cluster anchorage structure
