摘要
强风带动积雪漂移可能使结构处于稳定最不利状态,而目前在这方面的研究很少。该文研究一单层柱面网壳在风雪耦合作用下的动力稳定性。首先阐述风雪耦合作用下动力稳定性的研究方法,然后介绍风雪耦合作用的数值模拟,并通过风洞试验获得网壳表面的非定常气动力,最后分析了风雪耦合作用下单层柱面网壳的动力稳定。研究表明,斜风作用和不均匀分布积雪使单层柱面网壳更易于动力失稳,按荷载规范中雪荷载标准值来分析动力稳定得到的结论偏于不安全。
Structures may be subjected to instability when snow drifting on them happens under strong wind,which was studied less. In this paper, the dynamic instability of a single-layer reticulated cylindrical shell under coupled wind and snow loads is studied. The guideline for this study is firstly given. Then, snow drifting in wind fields is simulated by the CFD method and the unsteady aerodynamic forces on the shell are obtained by wind tunnel tests. Finally, the dynamic instability of the single-layer reticulated cylindrical shell under coupled wind and snow loads is analyzed, in which seven load cases are included. The analytical results show that yawed wind and ununiform snow pressure make the single-layer reticulated cylindrical shell be prone to dynamic instability and the application of conclusions drawn from the dynamic instability analysis by the uniform snow pressure in current Chinese Load Code is unsafe.
出处
《工程力学》
EI
CSCD
北大核心
2011年第11期210-217,224,共9页
Engineering Mechanics
基金
国家科技支撑计划项目(2006BAJ06B05)
科技部国家重点实验室基础研究项目(SLDRCE08-A-03)
关键词
单层柱面网壳
动力稳定
风雪耦合作用
计算流体动力学
风洞试验
single-layer reticulated cylindrical shell
dynamic instability
coupled wind and snow loads
computational fluid dynamics （CFD）
wind tunnel tests
