杂交型椭球面网壳参数化设计及受力性能分析

Parametric design and stability analysis of hybrid ellipsoid reticulated shell

杂交型椭球面网壳克服传统单一型椭球面和球面网壳随跨度S和环向区域份数K_n增加,结构顶点杆件数量增多而带来的杆件种类和尺度变化大等缺点,从而提高了结构的合理性,改善了结构的受力性能。文章根据杂交型椭球面网壳特点,采用APDL(Ansys Parametric Design Language)语言,研制了杂交型椭球面网壳参数化设计宏程序;以凯威特—肋环杂交椭球面网壳为例,应用ANSYS软件对其进行了受力性能分析。结果表明:同等工况下,凯威特—肋环杂交椭球面网壳顶点附近应力和位移均较小、且分布均匀,避免了单一网壳类型顶点附近应力集中现象,其受力性能优于单一类型凯威特、肋环型椭球面网壳;凯威特—肋环杂交椭球面网壳结构受力(2.35 N/m^2)后的最大位移和最不利应力随跨度的增加而逐渐增大,当跨度S_1≥110 m,K_n=6或K_n=8时最不利应力超过许用应力,工程中建议跨度上限为90~100 m。

Hybrid ellipsoid reticulated shell can overcome the shortcomings like the increase of the traditional single ellipsoidal and spherical reticulated shell with the span of S and the number of copies of the Kn ring, the construction difficulty by the increase of rod structure vertex number, and great changes of bar type and scale, thus improving the rationality of the structure and mechanical properties of the structure. According to the characteristics of hybrid ellipsoid reticulated shell, by using APDL （ Ansys Parametric Design Language） language, the paper designed of macro parameters of hybrid ellipsoid reticulated shell program. By taking Kewitte-rib ring hybrid ellipsoid reticulated shell as an example, and using ANSYS software, it analyzed its mechanical properties. The results show that under the same condition, the rib ring near the hybrid ellipsoid shell vertex displacement and stress are smaller and more evenly distributed, avoiding the single shell type vertex near the stress concentration phenomenon. Its mechanical performance is better than that of the single type, Kiewitt- ribbed ellipsoid reticulated shell. Kewitte-rib ring hybrid Ellipsoid Reticulated shell the structural stress （2.35 Kn/m^2 ） after the maximum displacement and the most disadvantageous stress gradually increases with the increase of span. The most unfavorable stress （ S1 span more than 110 m, Kn = 6,K,, -- 8 ） exceeds the allowable stress, and the engineering advice span limit is 90 - 100 m.