期刊文献+

雪荷载规范比较与风致雪漂移风洞试验方法研究 被引量:12

CODES COMPARISON AND WIND TUNNEL SIMULATION OF WIND-INDUCED SNOWDRIFT
原文传递
导出
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。 The non-uniform snow load on a complex roof is one of the most important factors that should be considered by a designer. The snow codes of China, America, Canada and Europe were compared, and the difference of equations and roof types were analyzed. Snowdrift simulation was carried out by using edible salt, silica sand, alum and dry sawdust of pine in a wind tunnel. The results show that in the four codes, snow loading is expressed by the product of reference snow pressure and coefficients in different types, and that fewer parameters on environment are considered in Chinese code, compared with other codes. As the adhesive force of alum is too strong, it is difficult to produce a continuous drift motion in a wind tunnel test for this material. The simulation effect of the dry sawdust of pine is not as good as its density is too small. The edible salt and silica sand with high density have relatively good simulation effects. In order to attain non-uniform snow loading on a structure in a design period by wind tunnel tests, the field observation with multiply parameters, the collection of meteorological data in detail, similarity criterion and parameter selection research are necessary as a basic research.
出处 《工程力学》 EI CSCD 北大核心 2015年第1期50-56,共7页 Engineering Mechanics
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)
关键词 风致雪漂移 雪荷载 荷载规范 风洞试验 试验技术 wind-induced snowdrift snow load load code wind tunnel test test technique
  • 相关文献

参考文献2

二级参考文献50

  • 1ASCE. ASCE/SEI 7 -05 Minimum design loads for buildings and other structures [ S]. Reston: ASCE Press, 2006.
  • 2NRC-IRC. National building code of canada 2005 [ S ]. Ottawa: NRCC, 2005.
  • 3NRC-IRC. User's guide-NBC 2005 structural commentaries (Part 4 of Division B) [ M ]. Ottawa : NRCC, 2005.
  • 4BSI. BS EN 1991-1-3:2003 Eurocode 1-actions on structures-part 1-3 : general actions-snow loads [ S ]. London: BSI, 2003.
  • 5O' ROURKE M, DE GAEANO A, TOKARCZYK J D. Analytical simulation of snow drift loading[ J]. Journal of Structural Engineering, 2005,131 (4) :660-667.
  • 6COCCA J, O' ROURKE M. Mathematical simulation of 50 year snow drift loads [ C ]//Structures Congress 2008 : Crossing Borders. Vancouver: ASCE, 2008.
  • 7HOCHSTENBACH F M, IRWIN P A, GAMBLE S L. Parametric studies of unbalanced snow loads on arched roofs [ C ]//Structures-Building on the Past : Securing the Future. Nashville : ASCE, 2004 : 1 - 11.
  • 8TAYLOR D A. Roof snow loads in Canada [ J ]. Canadian Journal of Civil Engineering, 1980, 7 ( 1 ) : 1 -18.
  • 9TAYLOR D A. Snow loads for the design of cylindrical curved roofs in Canada, 1953 -1980 [J]. Canadian Journal of Civil Engineering, 1981, 8(1) : 63 -76.
  • 10O' ROURKE M, DE ANGELIS C. Snow drifts at wind- ward roof steps [ J ]. Journal of Structural Engineering, 2002, 128(10): 1330-1336.

共引文献28

同被引文献69

引证文献12

二级引证文献37

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部