雪荷载规范比较与风致雪漂移风洞试验方法研究

发布时间：2019-05-19 16:11

【摘要】：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。
[Abstract]:The uneven snow load caused by wind-induced snow drift on complex roof is one of the key problems to be considered in the structural design of snowy area. This study compares four specifications on snow load between China and the United States, Canada and Europe, and compares the calculation expression and roof form of snow load. Through wind tunnel test, edible salt, silica sand, alum, dry pine sawdust and other materials are used. An experimental study on the problem of snow drift is carried out. The results show that the product of basic snow pressure and various coefficients is taken as snow load in the four codes, and compared with the other three codes, the environmental parameters affecting snow load are less considered in the codes of our country. Because of the large interparticle force, alum is not easy to produce continuous drift movement in wind tunnel test. Because the density of dry pine sawdust is too small, the simulation effect is not good, and the simulation effect of high density edible salt particles and silica sand is relatively good. In order to apply the wind tunnel test method in practical engineering, it is necessary to carry out multi-parameter field observation, collect complete meteorological data, and study the similarity relationship and test parameters of the test.
【作者单位】：石家庄铁道大学风工程研究中心;恒大集团;
【基金】：教育部新世纪优秀人才支持计划项目(NCET-10-0130) 国家自然科学基金项目(51378323) 河北省杰出青年科学基金项目(E2014210138) 河北省高等学校高层次人才项目(GCC2014046)
【分类号】：TU312.1

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