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风致雪飘移在复杂屋面上产生的不均匀雪荷载是多雪地区结构设计中需要重点考虑的问题之一。该研究对比了我国和美国、加拿大、欧洲四本关于雪荷载的规范,比较了雪荷载的计算表达式、屋面形式等内容,通过风洞试验,采用食用盐、硅砂、明矾、干松木屑等材料,对雪飘移问题进行了试验研究。结果发现:四本规范中都是将基本雪压与各种系数的乘积作为雪荷载;相对其他三本规范,我国规范对影响雪荷载的各种环境参数考虑相对较少;明矾因为颗粒间作用力较大,在风洞试验中不易产生连续的漂移运动;干松木屑因为密度太小,模拟效果也不佳;大密度的食用盐颗粒和硅砂的模拟效果相对较好;为了在实际工程中应用风洞试验的方法,需要进行多参数的现场观测、收集完整的气象资料、研究试验的相似关系和试验参数。
Wind-induced Snow Drift Uneven snow load on a complex roof is one of the key issues to consider in structural design in snowy regions. The study compares four snow load specifications in China, the United States, Canada and Europe, and compares the expressions of snow loads, roof forms and so on. Through wind tunnel tests, salt, silica sand, alum and dried pine sawdust Materials, the drift of snow carried out a pilot study. The results show that: The four specifications are the basic snow pressure and the coefficient of the product as a snow load; relative to the other three norms, our norms on snow load impact on a variety of environmental parameters considered relatively small; Alum because of the interaction between particles In the wind tunnel test, it is not easy to produce continuous drift movement. Because the density of dry pine chips is too small, the simulation results are not good. The simulation results of large-density edible salt particles and silica sand are relatively good. The application of wind tunnel test methods requires the observation of multiple parameters in the field, the collection of complete meteorological data, the study of similarities and experimental parameters.