拱形屋盖结构不平衡雪荷载的模拟研究  

A SIMULATION STUDY ON UNEVEN SNOW LOADS ON AN ARCH ROOF

作　　者：肖艳 杨易[1] XIAO Yan;YANG Yi(State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou,Guangdong 510641,China;College of Civil Engineering and Mechanics of Huazhong University of Science and Technology,Hubei,Wuhan,430074,China)

机构地区：[1]华南理工大学亚热带建筑科学国家重点实验室,广东广州510641 [2]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《工程力学》2018年第10期152-161,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51178441)

摘　　要：该文利用基于有限面元(Finite Area Element,FAE)方法对拱形屋面的不均匀积雪荷载进行了研究。首先设计制作了缩尺比为1∶100、矢跨比为0.125的拱形屋面风洞试验模型,通过风洞试验测得屋面平均风速大小,结合CFD数值模拟确定平均风速方向,再基于FAE方法利用风速-雪通量经验公式计算得到屋面的积雪分布系数;并分析了不同风速和不同风向角对屋面积雪分布系数及不平衡雪荷载的影响。其次,对基于FAE方法计算得到的积雪分布系数、基于两相流的CFD数值模拟结果以及我国现行《建筑结构荷载规范》GB 50009-2012的结果进行了比较。最后,总结了屋面雪荷载分布规律,给出了针对这类大跨结构雪荷载设计的一些建议。The finite area element(FAE)method was used to study the uneven snow load distributions on an arched roof.First,a wind tunnel arch model with the scale ratio of 1∶100 and the rise-span ratio of 0.125 was designed,the average wind speed on the roof was measured through wind tunnel experiment,and the average wind speed direction was determined by CFD numerical simulation.The snow distribution coefficient on the roof was then calculated using the FAE method of the wind-snow flux relation based on empirical formula.Second,the impacts of different wind speeds and wind attack angles on the snow distributions as well as the unbalanced snow loads on the roof were analyzed in detail.Third,the snow distribution coefficients of the FAE results,the code suggestion(GB50009-2012)and the CFD numerical simulation results based on two-phase flow were compared to verify the rationality of the FAE calculation results.Finally,some technical suggestions were proposed based on current research results,which was aiming at the perfection of the design code for snow loads.

关 键 词：拱形屋面 雪荷载 有限面元法 数值模拟 积雪分布系数 

分 类 号：TU312.1[建筑科学—结构工程]