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李永靖1，趙祝浩1，劉明哲2
(1 遼寧工程技術(shù)大學(xué)土木與交通學(xué)院，阜新123000; 2 遼寧省某預(yù)備役坦克團(tuán)，阜新123000)[摘要] 有初始幾何缺陷的雙層柱面網(wǎng)殼結(jié)構(gòu)其極限承載力及結(jié)構(gòu)穩(wěn)定性都有所降低，采用有限元分析軟件ADINA對雙層柱面網(wǎng)殼模型在無缺陷和有初始幾何缺陷兩種情況下，進(jìn)行了地震反應(yīng)分析對比，通過算例分析，在地震作用下其結(jié)構(gòu)節(jié)點位移明顯增大，個別節(jié)點位移增大近50%，且在指定頻域內(nèi)出現(xiàn)明顯峰值，數(shù)值模擬證明雙層柱面網(wǎng)殼結(jié)構(gòu)的初始幾何缺陷對結(jié)構(gòu)抗震性能的影響是不能忽視的。通過對網(wǎng)殼結(jié)構(gòu)進(jìn)行特征值屈曲分析，以第一階屈曲模態(tài)作為結(jié)構(gòu)初始幾何缺陷位置，得到了結(jié)構(gòu)非線性分析的臨界荷載量值，這對結(jié)構(gòu)進(jìn)行非線性分析提供了新的思路。
[關(guān)鍵詞] 屈曲模態(tài)；初始缺陷；臨界荷載；時程分析；隨機(jī)地震Earthquake analysis considering initial geometricalimperfection of double layer cylindricallattice shells
Li Yongjing1, Zhao Zhuhao1, Liu Mingzhe2
(1 Institute of Civil Engineering and Transportation, Liaoning Technical University, Fuxin 123000, China; 2 0ne Certain Reserve Tank Regiment of Liaoning Province, Fuxin 123000, China)Abstract: The authors give the earthquake analysis of double layer cylindrical lattice shells considering initial geometrical. Finite element analysis software ADINA is used separately to refer to the low step flexure model initial flaw model to the pilot model to carry on the contrast analysis, As a result of the initial flaw influence, the structure critical load dropped nearly 40%, under the earthquake the structure power displacement obviously increases, and in the frequency range the obvious peak value appears, which can cause the net shell to be easier to have the destruction. Therefore under the earthquake function, the double-decked cylinder network shell initial flaw can not be neglect to the structure earthquake resistance performance influence. Through the net shell structure, characteristic value of the first order are analyzed in buckling modes as initial geometric structure defect, the structure of the nonlinear analysis, the critical load of energy structure of nonlinear analysis provides a new idea.
Keywords: bucking model; initial geometrical imperfection; critical load; time-history analysis; random earthquake
