具有弹性和粘弹性材料特性的单层球面铝合金网壳动力学行为对比分析

Comparative analyses of dynamical characteristics between two aluminum alloy single-layer spherical reticulated shells with elastic and viscoelastic material characters

对具有相同跨度、相同矢跨比、相同杆件截面而分别具有弹性和粘弹性材料特性的两个单层球面铝合金网壳的线性谐响应特性以及在简谐荷载和地震荷载作用下的非线性振动特性进行了对比分析,考察了材料粘性对球壳振动特性的影响.研究结果表明:两类球壳线性谐响应特性的总体规律基本相似,但共振频率差别较大;无论在简谐荷载作用下还是在地震荷载作用下两类球壳的振动特性均有明显差异;材料本身的粘性对球壳的动力学行为有较大的影响,在高温、火灾、地震等特定环境下忽略材料的粘性会产生较大误差.

Comparative analyses of dynamical characteristics between two aluminum alloy single-layer spherical shells,which have the same span,same rise-span ratios and same bars but different material characters of elastic and viscoelastic,are presented.Influences about material viscosity on vibration behaviors of single-layer spherical aluminum alloy reticulated shell are illustrated.Results show that： although linear harmonic response properties are basically the same,there are great differences between the resonance frequencies of two shells.It has great difference of the dynamics characteristics under harmonic loads or seismic loads.Dynamics characteristics are greatly influenced by the viscous properties of material itself.