摘要
该文结合风灾案例对城市群体建筑玻璃幕墙受碎粒飞掷物冲击易损性开展研究。建筑物周边的三维流场通过大涡模拟方法得到,在此基础上采用五阶龙格库塔法求解粒状飞掷物的三维刚体运动方程并进行飞掷物轨迹预测,最后建立飞掷物运动参数的随机概率模型,采用蒙特卡洛方法随机产生碎粒飞掷物,开展塔楼群中飞掷物对幕墙冲击破坏易损性研究。结果表明,在强风作用下上游建筑的局部初始破坏产生的碎粒将冲击下游建筑幕墙,并可能放大风灾破坏级别及损伤程度,其冲击范围与建筑布局有关,冲击破坏损伤程度则与当来流风速有关。就该文风灾案例而言,当风速小于15m/s时,二次冲击破坏的影响基本可忽略不计;风速大于30m/s时,开始出现中等程度破坏;风速大于40m/s后,下游整个立面幕墙受冲击破坏程度达到严重破坏,说明此时相邻建筑局部初始破坏已经放大周边建筑风灾破坏程度,应引起足够的重视。
Based on one case of wind induced damage to glass curtain wall of a tower building group,fragility analysis of the glass curtain wall under impact action of the windborne debris on the downstream building was investigated.Firstly,the three-dimensional unsteady flow field around the buildings was obtained by the large eddy simulation.Trajectory of the granular debris then was numerically predicted adopting the five-order Runge-Kutta method.Finally,the stochastic probability model of motion parameters of the debris was established.Influence of the wind-borne debris,randomly generated by the Monte Carlo method,on the vulnerability of the facade curtain wall of the building in the downstream,was studied in detail.The results show that the debris of initial broken pieces of upstream curtain wall could impact downstream buildings and induce chain failure in wind hazards.The impact range is related to the building layout,and the impact damage level is related to the incoming wind speed.And damage would aggravate with increasing wind speed.As for the present case,when the wind speed is less than 15m/s,the wind-born debris'impacting damage to the facade glass curtain wall of the downstream buildings could be neglected.If the wind speed is beyond 30 m/s,the impacting damage is moderate level.When the wind speed is beyond 40 m/s,the wind-born debris'impacting could reach up to serious level,causing relatively large damage zones on the curtain wall.In the wind resistance design for glass curtain wall against wind borne debris,special attention should be paid on the situation that the local initial damage of upstream building under strong wind will enlarge the wind induced damage level and damage degree on the facade curtain wall of surrounding buildings.
作者
唐意
郑德乾
曹志程
薛原
Tang Yi;Zheng Deqian;Cao Zhicheng;Xue Yuan(China Academy of Building Research,Beijing 100013,China;State Key Laboratory of Building Safety and Environment,Beijing 100013,China;Henan University of Technology,Zhengzhou 450001,China)
出处
《土木工程学报》
北大核心
2025年第1期58-64,76,共8页
China Civil Engineering Journal
基金
建筑结构振(震)动响应机理与性能提升关键技术研究(20220122330730021)。
关键词
群体建筑
玻璃幕墙
颗粒飞掷物
飞行轨迹
易损性分析
high-rise building groups
glass curtain wall
wind-borne debris
flying trajectory
fragility analysis
