摘要
为研究双层网壳屋盖各杆件在随机风荷载下的二阶矩稳定性,首先基于随机稳定理论,将杆件横向振动模拟为以振幅和相位角表示的二维马尔可夫过程,推导了杆件风致随机失稳边界方程;然后根据测压模型风洞试验结果拟合了网壳屋盖各杆件的风荷载功率谱,代入随机失稳边界方程可实现对各杆件的风致随机稳定性进行评价。数值计算结果表明,双层网壳屋盖的二阶矩稳定性受到风向、平均风速和杆件截面尺寸和弹性模量的影响。
In order to study the second-order moment stability of each member of the double-layer reticulated shell roof under stochastic wind load,based on theory of stochastic stability,transverse vibration of the member was modeled as a two-dimensional Markov process representing response amplitude and phase angle,and the boundary equation of stochastic stability of member was derived.Subsequently,wind spectra acting on members of roof were fitted according to the results of wind pressures on the roof from wind tunnel tests,and then the wind-induced stochastic stability of all members could be evaluated by substituting the wind spectra in the boundary equation.Numerical computations indicate that the second-order moment stability of the double-layer shell roof is affected by wind-attacking angle,mean wind speed,cross-sectional dimensions and Young’s modulus of members.
作者
许恩林
黄友钦
XU Enlin;HUANG Youqin(Guangzhou University-Tamkang University Joint Research Center for Engineering Structure Disaster Prevention and Control, Guangzhou University, Guangzhou 510006, China)
出处
《中国科技论文》
CAS
北大核心
2020年第6期628-635,共8页
China Sciencepaper
基金
国家自然科学基金资助项目(51208126)
广州市科技计划项目(201904010307)
广州大学研究生“基础创新”项目(2017GDJC-M34)。
关键词
双层网壳屋盖
杆件
随机风荷载
矩稳定
参数分析
double-layer reticulated shell roof
members
stochastic wind load
moment stability
parametric analysis
