摘要
北方恶劣降雪条件下,建筑物上所积冰雪可能因冰雪层融化发生滑落,进而对地面人或物品产生安全隐患。对于超高层建筑,滑落积雪产生的巨大冲量将大大加深这种危害。本文基于前人研究成果,增加考虑了建筑屋面、雨棚等的朝向问题,以及超高层项目中空气温度会随高度变化的特点,对模型加以改进。并以某超高层建筑项目为例,研究了高度、朝向等对滑移雪荷载的影响,最后本文提出以单位面积滑落冲量这一新指标来表征冰雪滑落对地面人或物品造成的影响更为合理。研究表明,南侧屋面发生冰雪坠落次数多于北侧,但坠落单位面积质量小于北侧;对于超高层高处的窗檐区域,由于空气温度随高度增加而减小,降雪结冰后累积质量相对较大,同时从高区发生冰雪坠落的冲量更大,对地面行人和物品造成的伤害风险较大,应予以特别关注。
Under the severe snowfall conditions in North China,the ice and snow accumulated on buildings may slide due to the melting of ice and snow layer,which may cause safety hazards to people or objects on the ground.For super high-rise buildings,the huge impulse caused by snow sliding will greatly deepen the harm.In this paper,based on the previous research results,the orientation of building roof and canopy,and the characteristics of air temperature changing with height in super high-rise project are considered,and then the model is improved.Taking a super high-rise building project as an example,the influence of height and orientation on sliding snow load is studied.Finally,it is more reasonable to describe the impact of snow and ice sliding on people or objects on the ground by the new index of sliding snow impulse per unit area.The results show that the number of snow and ice falling on the south side is more than that on the north side,but the unit area mass of falling snow is less than that on the north side;for the super high-rise window eaves area,because the air temperature decreases with the increase of height,the accumulated mass after snow freezing is relatively larger,and the impact of snow and ice falling from the high-rise area is greater,which will cause greater risk of injury to pedestrians and objects on the ground,and should be particularly concerned.
作者
岳煜斐
何连华
韦劲松
王萌
李宏海
邓杰
Yue Yu-fei;He Lian-hua;Wei Jing-song;Wang Meng;Li Hong-hai;Deng Jie(CABR Technology Co.Ltd.,Beijing 100013;China Academy of Building Research,Beijing 100013;National Key Laboratory of Building Safety and Environment,Beijing 100013;Technology Management Product R&D Department of Greenland Group,Shanghai 200023;Technology R&D Center of Northwest Regional Management Headquarters of Greenland Group,Xi'an 710076;Disaster Prevention Research,Ministry of Housing and Urban-Rural Development,Beijing 100013)
出处
《建筑科学》
CSCD
北大核心
2020年第S02期78-84,共7页
Building Science
基金
国家重点研发计划项目(2017YFC0803300)
关键词
冰雪滑落
融雪模型
超高层
滑移质量
滑落冲量
Snow and ice sliding
Snowmelt model
Super high-rise building
Sliding snow mass
Sliding snow impulse
