Development of wind load evaluation methods considering possible extreme wind pressure distributions applicable to performance based design

考虑可能的极端风压分布的风荷载评估方法的开发，适用于基于性能的设计

基本信息

批准号：
11555155
负责人：
TAMURA Yukio
金额：
$ 8万
依托单位：
TOKYO INSTITUTE OF POLYTECHNICS
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Fluctuating wind pressures acting on the surfaces of low-rise and high-rise building models with various aspect ratios and side ratios were measured. Maximum quasi-static wind load effects were calculated, such as shear forces, bending moments and frame stresses. The instantaneous pressure distributions causing the maximum load effects were examined in detail based on a sufficient number of samples. The obtained possible wind pressure distributions for various wind load effects were quite different from the quasi-steady wind load distributions based on mean pressure distributions. The load-response correlation (LRC) formula by Kasperski was applied to the internal forces of the frames, and the results were compared with possible wind pressure distributions. Then, the scope of LRC formula was examined.The correlations and phase plane trajectories of wind force components were also investigated. The results suggest that the cross-correlation of the absolute values of wind force components was more appropriate for examining the wind load combinations than ordinary cross-correlations. Then, the contribution of each wind load component to the maximum normal stresses in column members was examined. It was clearly recognized that the maximum normal stress was significantly underestimated if only the along-wind load component was taken into account for calculation. This strongly suggests the importance of considering the combinations of along-wind, across-wind and torsional wind load components even for low-rise or middle-rise buildings.Additionally, non-elastic responses of frame models of high-rise buildings were analyzed for extremely high wind speeds, and the building behaviors around the ultimate states were clarified.Based on these comprehensive studies of wind loads and building behaviors, wind load evaluation methods wee developed that consider possible extreme wind pressure distributions applicable to performance based design.

测量了作用于具有各种纵横比和侧比的低层和高层建筑模型表面上的波动风压。计算了最大准静态风负荷效应，例如剪切力，弯矩和框架应力。基于足够数量的样品，详细检查了导致最大负载效应的瞬时压力分布。根据平均压力分布，获得的各种风负荷效应的可能的风压分布与准稳态的风负荷分布完全不同。将kasperski的负载反应相关性（LRC）公式应用于框架的内力，并将结果与可能的风压分布进行了比较。然后，研究了LRC公式的范围。还研究了风力成分的相关性和相位平面轨迹。结果表明，与普通的互相关相比，风力成分的绝对值的互相关更适合检查风负荷组合。然后，检查了每个风负荷分量对列成员中最大正常应力的贡献。清楚地认识到，如果仅考虑沿风负载分量的计算，则明显低估了最大正常应力。这强烈表明，即使在低层或中层建筑中考虑沿风，各个风险和扭转的风负荷组件的组合的重要性。可能适用于基于性能的设计的极端风压分布。