Abstract
Design wind speeds for a low-rise building below Zb are provided as a constant value in Japanese codes and specifications. The wind loads for a low-rise building are usually safer but impractical structural design are sometimes required when the building height is lower than Zb. In the present study, wind speed near the ground with roughness blocks are measured with a wind tunnel experiment and computational fluid dynamics with large eddy simulation (LES). The characteristics of the mean and fluctuating wind speeds are compared to the results of the previous studies, and the previous equation for estimating turbulence intensity is extended from the result of the present study. Finally, the proper orthogonal decomposition analysis was performed on the wind speeds obtained from the LES simulation to understand the spatial characteristics of wind fluctuation near the ground.
