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利用有限元数值模拟研究了在平面内荷载作用下,腹板间距、腹板高度、泡沫芯材弹性模量等因素对格构腹板增强型泡沫夹层结构腹板屈曲性能的影响。结合有限元分析结果提出半波数基床系数,采用文克尔地基模型模拟泡沫芯材对格构腹板增强型泡沫复合材料夹层结构腹板的弹性支撑作用,基于Ritz法提出腹板平面内荷载作用下屈曲荷载理论分析方法和计算公式。分析表明:泡沫芯材的存在使得腹板的屈曲特性不同于无芯材时屈曲特性,随腹板高度增加屈曲荷载表现出平稳增加的趋势,屈曲形态呈现出多峰特征的褶皱;腹板间距和高度较大时,泡沫芯材的支撑对腹板的稳定起到主导作用;理论方法分析结果、有限元结果以及试验数据总体上一致。
The influence of web spacing, web height, modulus of foam core and other factors on the buckling behavior of webs with lattice stiffeners was studied by finite element numerical simulation. Based on the results of finite element analysis, the coefficient of half-wave bed coefficient was proposed. The Winkler foundation model was used to simulate the elastic supporting effect of foam core on the web of sandwich panel with reinforced foam composite sandwich structure. Based on Ritz method, Buckling load theoretical analysis and calculation formula under action. The results show that the existence of foam core makes the buckling behavior of the web different from that of the non-core material. With the increase of the web height, the buckling load shows a steady increase, and the buckling shows a multi-peak fold. The web spacing When the height is large, the support of the foam core plays a leading role in the web stability. The results of the theoretical analysis, the finite element results and the experimental data are generally consistent.