台风山竹期间玻璃围护结构破坏研究及对规范相关风荷载计算规定的建议

Glass enclosure structure damage study during period of typhoon mangkhut and suggestions on specifications for calculating relevant wind loads

台风山竹是近30多年来登陆中国香港的最强台风,其对中国香港很多建筑的玻璃围护结构造成了不同程度的破坏。作为一个受到经常性台风威胁的广泛采用玻璃围护结构的大都市,中国香港的玻璃围护结构破坏研究对于其他地区类似环境的玻璃围护结构抗风设计具有借鉴意义。基于研究团队所掌握的资料(公共渠道信息及团队成员的现场观察)总结了本次台风玻璃围护结构破坏的特点,并针对这些破坏特点,对当前中国规范围护结构风荷载计算的相关规定进行了讨论,建议视项目性能需求可考虑如下高于规范要求的计算或设计措施:负压区采用建筑顶部作为参考高度,注意建筑间的不利干扰,考虑意外主导洞口可能导致的破坏风险,在飞射物破坏高危区采用针对性措施以降低或减小破坏影响,在必要情况下考虑对吊顶及内隔墙进行抗风设计。

Typhoon Mangkhut is the strongest typhoon that has struck Hong Kong,China,in the past 30 years.It has caused varying degrees of damage to the glass enclosure structure of many buildings in Hong Kong,China.As a metropolis with glass enclosure structure widely used and threatened by frequent typhoons,glass enclosure structure damage research in Hong Kong,China,can be used as a reference for wind-resistant design of glass enclosure structure in similar environments in other regions.Based on the data obtained by the research team(public channel information and on-site observation of team members),the characteristics of glass maintenance damage during this typhoon were summarized.In view of these characteristics,the relevant provisions of the current Chinese code for wind load calculation were discussed.It is recommended that the calculation or design measures higher than the specification requirements should be considered according to the performance requirements of the project,including adoption of roof height as reference height for suction zones,consideration of negative interference among buildings,consideration of risk of destruction cause by dominant openings,adoption of corresponding measures to prevent or minimize wind-induced debris damages for high risk zones,and design for ceiling and internal walls if needed.