摘要
以张力腿平台为基础的大跨度浮式悬索桥建设方案在高水深、软土质的环境中具有较好的应用前景。由于其基础刚度较弱,行车荷载可能会引发桥梁的剧烈振动,可以通过张力腿基础设计参数的调整削弱其影响,但目前对行车荷载作用下该新型大跨度浮式桥梁的研究较少,此类方案可行性与适用性亟需得到验证。利用有限元软件计算行车荷载作用下的大跨度浮式悬索桥模型响应,改变基础浮箱淹没深度、拉索倾角,采用模态分析方法研究在行车荷载作用下张力腿基础设计参数变化对结构响应的影响。结果表明:大跨度浮式悬索桥的淹没深度、拉索倾角参数调整主要改变前两阶振型,且对横向响应影响较大;加大浮式基础的淹没深度、增加倾斜布置的张力腿拉索均能有效减小其在行车荷载作用下的振动,其中,对拉索倾角在何种角度可以使行车荷载作用下的浮桥响应达到最小,则需要通过具体分析得出;在设计阶段需尽可能详尽考虑相关张力腿基础设计参数,以增加整个浮桥方案在行车荷载作用下的应用可行性与适用性。
Construction schemes for long-span floating suspension bridges based on tension leg platforms have high application prospects in high water depth and soft soil environments.Due to their low foundation stiffness,vehicle loads may induce significant vibrations in bridges.This phenomenon can be mitigated by adjusting the parameters of the tension leg platform.So,there is limited research on this novel long-span floating bridge under vehicle loads.However,the feasibility and applicability of such schemes need validation.This paper utilized finite element software to compute the response of a floating suspension bridge model under the vehicle load.The effect of changes in the submerged depth and cable inclination angle on the response was investigated using methods such as modal analysis.The study revealed that adjusting the parameters of the submerged depth and cable inclination angle primarily alters the first two vibrational modes,significantly affecting the lateral responses.Increasing the submerged depth of the platform and adding inclined tension leg cables effectively reduced vibrations under the vehicle load.Additionally,the optimal modification of the cable inclination angle requires specific analysis.Therefore,during the design phase,the relevant tension leg platform design parameters are crucial for finding the most suitable configuration,which can enhance the overall feasibility and applicability of floating bridges under the vehicle load.
作者
白芷毓
魏凯
张枫
张择端
BAI Zhiyu;WEI Kai;ZHANG Feng;ZHANG Zeduan(State Key Laboratory of Bridge Intelligent and Green Construction,Southwest Jiaotong University,Chengdu 611756,P.R.China;Nanchang Urban Planning and Design Research Institute Group Co.,Ltd.,Nanchang 330038,P.R.China)
出处
《土木与环境工程学报(中英文)》
北大核心
2025年第3期201-209,共9页
Journal of Civil and Environmental Engineering
基金
国家自然科学基金(52222804、52221002)。
关键词
浮式悬索桥
行车荷载
张力腿基础
设计参数
动力响应特性
long-span floating suspension bridge
vehicle load
tension leg platform
design parameters
dynamic response characteristics
