关键词: 高温；板壳结构；局部热屈曲；后屈曲

Abstract: The traditional methods for analyzing the thermal buckling have the restrictions on dealing with the buckling of the complex plate-shell structures under the coupling of the thermal and mechanical loadings. The rational methods for analyzing the thermal buckling are conducive to improving the plate-shell design level. In the light of the above understanding，according to the structural and mechanical characteristics of high temperature plate-shell，under the hypothesis of the effects of the mechanical loadings equivalent to the local boundary stress，four kinds of local thermal buckling theoretical models were firstly proposed. The post-buckling behavior of the complete plate-shell and the one with initial defects were studied based on initial post-buckling asymptotic analysis theory. Pre-loaded four edge simple-supported model，pre-loaded four edges clamped model，pre-loaded three edges simple-supported one edge free model，pre-loaded three edges clamped one edge free model were studied in detail. The effects of structural geometry parameters (the length，thickness，etc.) on the post-buckling behavior of plate-shell structures were investigated and were extended to the solution of the high order thermal buckling problem. The results have shown that the buckling type of plate structure is bifurcation，and the shell structure’s is jumping. And under the constant length-width ratio，the critical load of buckling follows the rules that it decreases as the length increases while it increases as the thickness increases.

Key words: High temperature；Plate-shell structure；Local thermal buckling；Post-buckling