附着式整体升降脚手架的风荷载研究

Research on Wind Load of Adhesive Integral-Lift Scaffold

风荷载是脚手架抗风计算的主要设计荷载之一,对脚手架进行风速时程模拟可以更直观准确地了解脉动风作用下脚手架的动力特性。在考虑脚手架节点间风速时程的时间和空间相关性的基础上,选用Davenport谱和线性滤波法中的自回归(Auto-Regressive,AR)模型推导出四阶AR模型的参数表达式来模拟脚手架的风速时程。通过比较模拟风速功率谱与目标风速功率谱的吻合程度,实现了脚手架风速时程的精确模拟。对所得到的风荷载时程曲线进行分析,为实际工程中脚手架的风振分析提供了参考依据。

Wind load is one of the main design loads of scaffold to calculate the wind resistance.Simulation of wind speed time-history of scaffold can be more intuitive and accurate to understand its dynamic performance under the action of fluctuating wind.On the basis of considering the time and spatial correlation of wind speed time-history between each node of scaffold,choosing Davenport spectrum and autoregressive(Auto-Regressive,AR)model of linear filtering method to deduce the parameter expression of fourth order AR model to simulate wind speed time-history of scaffold.By comparing the good agreement between the simulation of wind power spectrum and the target of wind power spectrum to achieve the accurate simulation of the wind speed time-history of scaffold.Then the analysis of curve of wind speed and wind load time-history provides reference for the wind vibration research of scaffold in the practical engineering.