高层隔震结构风振研究

摘要

To study the wind-induced response of high-rise isolated structure, fluctuating wind speed time series is simulated by employing auto-regressive linear filtering method, with which average wind speed is translated into fluctuating wind load and input into the high-rise isolated structure. And the stability of wind resistance of the isolated structure is contrasted in enduring 20, 30 and 50-year return period wind load. Then the analysis of the earthquake energy absorption properties of the high-rise isolated structure is carried out. The results show that with enduring 50-year return period wind load, it's difficult to keep isolation layer unyield while the excellence in the earthquake energy absorption properties of the isolated structure is kept. Therefore, it's proposed in this essay that to keep isolation layer unyield with enduring 20 to 30 year return period wind load could be considered; and the acceleration of the top of the isolated structure can generally meet the human comfort degree index.%为研究高层隔震结构的风振响应,采用线性回归滤波器法模拟脉动风速时程,并将其与平均风速转化为风压时程输入某25层高层隔震结构,对比结构在20年、30年和50年一遇风荷载下的抗风稳定性,并分析结构在地震中的减震性能.结果表明,为保证高层隔震结构在地震中有一定减震性能,要使隔震层满足遭遇50年一遇的风荷载不屈服较为困难,因此,本文建议考虑隔震层遭遇20年～30年一遇的风荷载不屈服,而高层隔震结构顶部风振加速度一般可以满足人体舒适度指标.