基于弯剪梁模型和Von Karman风速谱的高层建筑风振系数实用算法

Practical Algorithm for Dynamic Response Factor of Tall Buildings Based on Bending-Shearing Beam Model and Von Karman’s Wind Speed Spectrum

摘要:

为使风振系数计算中采用的振型函数更符合高层建筑振型特点且易于计算，采用基于弯剪梁模型的高层建筑基本振型简化算式，同时采用Von Karman与高度有关的风速谱模型和Davenport与频率有关的空间相关性模型，建立高层建筑风振系数计算的实用算式，并通过算例与我国现行荷载规范中的风振系数算式进行比较。结果表明，该方法考虑了不同高层建筑振型的特点，既提高了计算精度，简单实用，又便于与国际主流荷载规范接轨。

Abstract:

In order for the mode functions adopted in the formulation of dynamic response factor （DRF） or gust loaded factor （GLF） to fit better to the modes of real tall buildings and be easy for calculation， tall buildings with uniform cross sections are modeled as cantilever bending-shearing beams and a simplified fundamental vibration mode with high accuracy is adopted. A practical algorithm for the DRF of tall buildings based on the bending-shearing beam model and its simplified mode is proposed. Von Karman’s wind speed spectrum and Davenport’s spatial correlation function in frequency domain are adopted in the algorithm. The results of the DRF given by the algorithm are compared with those given by the Chinese wind loading code （GB50009—2012） through numerical examples. The result shows that the simplified algorithm for the DRF of tall buildings given in this paper considered the modal characteristics of different tall buildings， and are both accurate， simple to use， and easy to connect with main foreign wind loading codes.