The subject of this investigation is to study the buckling of orthotropic cylindrical thin shells under torsion, which is a power function of time. The dynamic stability and compatibility equations are obtained first....The subject of this investigation is to study the buckling of orthotropic cylindrical thin shells under torsion, which is a power function of time. The dynamic stability and compatibility equations are obtained first. These equations are subsequently reduced to a time dependent differential equation with variable coefficient by using Galerkin's method. Finally, the critical dynamic and static loading, the corresponding wave numbers, the dynamic factors, critical time and critical impulse are found analytically by applying the Ritz type variational method. Using those results, the effects of the variations of the power of time in the torsion load expression, of the loading parameter, the ratio of the Young's moduli and the ratio of the radius to thickness on the critical parameters are studied numerically. It is observed that these factors have appreciable effects on the critical parameters of the problem in the heading.展开更多
为简化网壳结构在风荷载下的弹塑性动力失效分析过程,提出了基于动力失效的等效静力风荷载的简化计算方法,使网壳结构的抗风设计同时满足强度和稳定性的要求.通过对单层柱面网壳结构进行风荷载下的静力、动力失效全过程分析,给出了综合B...为简化网壳结构在风荷载下的弹塑性动力失效分析过程,提出了基于动力失效的等效静力风荷载的简化计算方法,使网壳结构的抗风设计同时满足强度和稳定性的要求.通过对单层柱面网壳结构进行风荷载下的静力、动力失效全过程分析,给出了综合Budiansky-Roth准则和Hsu S C准则的动力失效判别方法,以准确、有效地确定网壳结构的动力失效临界荷载系数.结合概念分析和定量计算,指出了风荷载下网壳结构的动力失效模式包括弹性动力失稳破坏、弹塑性动力失稳破坏和塑性动力强度破坏.对比网壳结构的静力、动力失效临界荷载系数,确定了基于动力失效的等效静力风荷载系数,可为网壳结构抗风设计提供参考.展开更多
文摘The subject of this investigation is to study the buckling of orthotropic cylindrical thin shells under torsion, which is a power function of time. The dynamic stability and compatibility equations are obtained first. These equations are subsequently reduced to a time dependent differential equation with variable coefficient by using Galerkin's method. Finally, the critical dynamic and static loading, the corresponding wave numbers, the dynamic factors, critical time and critical impulse are found analytically by applying the Ritz type variational method. Using those results, the effects of the variations of the power of time in the torsion load expression, of the loading parameter, the ratio of the Young's moduli and the ratio of the radius to thickness on the critical parameters are studied numerically. It is observed that these factors have appreciable effects on the critical parameters of the problem in the heading.
文摘为简化网壳结构在风荷载下的弹塑性动力失效分析过程,提出了基于动力失效的等效静力风荷载的简化计算方法,使网壳结构的抗风设计同时满足强度和稳定性的要求.通过对单层柱面网壳结构进行风荷载下的静力、动力失效全过程分析,给出了综合Budiansky-Roth准则和Hsu S C准则的动力失效判别方法,以准确、有效地确定网壳结构的动力失效临界荷载系数.结合概念分析和定量计算,指出了风荷载下网壳结构的动力失效模式包括弹性动力失稳破坏、弹塑性动力失稳破坏和塑性动力强度破坏.对比网壳结构的静力、动力失效临界荷载系数,确定了基于动力失效的等效静力风荷载系数,可为网壳结构抗风设计提供参考.
