高耸塔器的风振模拟及其采用侧向支撑的减振分析

Wind Induced Vibration Simulation of High-rise Tower and Its Vibration Reduction Analysis under Lateral Supporting

以某炼化工程中的高耸塔为研究对象,选取Davenport风速谱,基于M.Shinozuka谐波叠加法编制MATLAB程序,得到塔体脉动风载荷时程样本,对塔体进行顺风向的风振响应分析。结果表明,模拟的风载荷功率谱与目标谱吻合较好,且风载荷数据符合均值为零的正态分布,脉动风载荷模拟质量高;单独塔体在脉动风载荷作用1200 s,风振效应明显,塔顶最大位移可达到0.512 m;当塔体侧向支撑采用弹簧时,塔体晃动的减弱效果不明显;当塔体侧向支撑采用阻尼器时,塔顶最大位移随着阻尼系数的增加迅速减小,其值可减小到约0.1 m,塔体侧向设置阻尼器能够大幅防止塔体风振,有效提高塔体的抗风性能。

Taking a high-rise tower in refining engineering as the object, the along-wind responses for the tower body were analyzed. Selecting davenport wind speed spectrum, fluctuating wind load samples were simulated by the MATLAB program which based on harmonic superposition method. The results show that the simulated wind load power spectrum is in good agreement with the target spectrum, and the wind load data conform to normal distribution with zero mean, which indicate that the simulation of fluctuating wind load is of good quality. Subjected to fluctuating wind load of 1200 s, the wind vibration effect of tower is apparent,and the maximum top displacement can be up to 0. 512 m. While taking springs as lateral sup- port of tower, the tower body still shakes violently. While taking dampers as lateral support of tower, the maximum top displacement of tower decreases rapidly with increase in damping coefficient. And the maximum top displacement of tower is reduced to about O. 1 m. The wind-resistance performance can be improved effectively by setting damper shock absorbers on the side of the tower.