Large span space structure is very sensitive to wind load and snow load,the determination of dynamic instability critical wind velocity under snow load is the key to the wind and snow resistant design of reticulated shell structure.In order to study the dynamic response characteristics of spherical reticulated shell under the combined action of wind load and snow load,the finite element model of K8-8 single-layer spherical reticulated shell was established.Using MATLAB program to obtain random wind velocity time-history curves,the influence of different supports and distributions of snow load on the overall stability of spherical reticulated shell was analyzed.The results showed that strengthening the restraint of the support is conductive to improve the whole wind resistance of spherical reticulated shell.When snow load is uniformly arranged along the outer two ring windward surface,the critical wind velocity is lower than that of the snow load uniformly distributed along the whole span and snow load uniformly distributed along the half-span,and the snow load is arranged as the most dangerous arrangement.%大跨度空间结构对风雪荷载十分敏感,风雪荷载作用下动力失稳临界风速的确定是网壳结构抗风雪设计的关键.为了研究风雪荷载共同作用下球面网壳的动力响应特性,通过建立K8-8型单层球面网壳有限元模型,利用MATLAB程序获取随机风速时程曲线,分析了不同支座形式和雪荷载不同分布情况对球面网壳整体稳定性的影响.结果表明:加强支座约束有利于提高球面网壳整体抗风性能,迎风面最外两环布置均布雪荷载较全跨均布雪荷载和半跨均布雪荷载所确定的动力失稳的临界风速更低,为最不利雪荷载布置.
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