摘要
研究了悬浮隧道锚索在地震与水动力共同作用下的动力响应。通过将悬浮隧道锚索简化为欧拉梁模型,建立悬浮隧道锚索受到水动力和地震共同作用振动的运动方程。采用分离变量法和伽辽金法求解运动方程,并使用四阶龙格-库塔法求解得到悬浮隧道锚索的位移响应情况。采用三角级数法模拟生成人工地震波,并选用了三种著名的地震记录,对悬浮隧道在不同地震波激励下的关键结构参数对锚索位移响应进行数值分析。结果表明:(1)地震的加速度越大,锚索的运动响应越剧烈,产生的位移和能量越大。地震波的峰值加速度出现时间和大小也对锚索的峰值振幅有一定影响。(2)参数频率和阻尼比等因素对锚索的位移都有重要的影响,但在不同的地震作用下影响程度不同。通过控制参数频率和阻尼比可以减小地震对悬浮隧道锚索及整体结构的破坏效果。
The dynamic response of anchor cables of a submerged floating tunnel under the combined action of earthquake and hydrodynamic force was studied.The anchor cable of the submerged floating tunnel was simplified as Euler beam model and the motion equation of anchor cables of the submerged floating tunnel subjected to earthquake and hydrodynamic vibration was established.The motion equation was simplified by separating variables and Galerkin method,and the displacement response of anchor cables was solved by a fourth-order Runge-Kutta method.The dynamic behavior of cables under hydrodynamic action was obtained by displacement power spectrum analysis.Artificial seismic waves were generated by means of the triangular series method and three famous seismograms were adopted.The key structural parameters of the submerged floating tunnel under different seismic excitation were numerically analyzed.The results show that:(1)The increase of seismic acceleration will cause the motion response of anchor cables to become more intense,resulting in greater displacement and energy.The time and magnitude of peak acceleration of seismic wave also have certain influence on the peak amplitude of anchor cables.(2)Parameter frequency and damping ratio have important effects on the displacement of anchor cables and the influence degree is different under different earthquake action.The damage effect of earthquake on anchor cables and the overall structure of suspension tunnel can be reduced,by controlling parameter frequency and damping ratio.
作者
阳帅
颜晨宇
巫志文
YANG Shuai;YAN Chenyu;WU Zhiwen(School of Civil Engineering Guangxi University,Nanning 530004,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2021年第2期304-310,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金项目(51808136)
广西自然科学基金项目(2018JJB160058)资助
关键词
悬浮隧道
锚索
地震激励
欧拉梁理论
动力响应
submerged floating tunnel
cable
earthquake excitations
Euler beam theory
dynamic response
