大跨斜拉桥多维多点地震激励减震控制方法分析

首先利用SIMULINK仿真工具箱建立了大跨度斜拉桥在多维多点地震激励下的半主动减震控制分析模型.然后采用拟合规范反应谱的多点人工地震动时程,研究并比较分析了一致激励以及同时考虑行波效应和部分相干效应等激励工况下,行波波速以及部分相干程度对斜拉桥减震效果的影响规律.数值结果表明:无论是有控还是无拉结构,考虑多点激励后,主粱中踌跨中出现较大竖向位移和轴力,且竖向位移随着行波波速的减小和部分相干程度的减弱呈增大的趋势;行波效应和部分相干效应总体上对减震效果的影响很小;主动和半主动控制算法控制效果接近,优于始终提供最大阻尼力的被动控制算法.

Real-time dynamic operation of reservoir water levels during flood season based on integrated information

In order to improve flood water utilization rate during flood season, a real-time dynamic operation of reservoir water levels called improved pre-storage & pre-discharge method is presented, in which real-time information of flood, rainfall, engineering and short-term flood and rainfall forecast issue is studied synthetically. Through its application to Huanren Reservoir and gradient reservoir group, and compared with the originally designed flood operation of reservoir, the results show that the real-time dynamic operation method based on integrated information can increase hydropower generation without increasing flood risk. The method is feasible and practical, and it can also be applied to other reservoirs, especially to the large-scale reservoir or hydropower station for real-time operation in the water shortage region of North China.