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1、青島理工大學(xué)工學(xué)碩士學(xué)位論文摘要局部雙層柱面網(wǎng)殼結(jié)構(gòu)是空間網(wǎng)殼結(jié)構(gòu)的一種,它可在單層網(wǎng)殼結(jié)構(gòu)的局部通過增加弦桿和腹桿,形成主要的受力體系;或者按照一定的規(guī)律抽去雙層網(wǎng)殼結(jié)構(gòu)的部分弦桿和腹桿而形成。局部雙層網(wǎng)殼結(jié)構(gòu)克服了單層網(wǎng)殼結(jié)構(gòu)穩(wěn)定性差,桿件材料強(qiáng)度得不到充分發(fā)揮的缺點(diǎn),同時相對于雙層網(wǎng)殼結(jié)構(gòu)有具有桿件數(shù)量合理,外觀簡潔美觀的優(yōu)點(diǎn),具有良好的應(yīng)用前景。當(dāng)前,大跨網(wǎng)殼結(jié)構(gòu)的分析方法主要包括線性靜力分析,即特征值屈曲分析和考慮包括幾何非線性和材料非線性的非線性分析方法。非線性方法能夠較真實(shí)的模擬網(wǎng)殼結(jié)構(gòu)受力及變形的全過程,其分析結(jié)果與工程實(shí)
2、際較為接近,是網(wǎng)殼結(jié)構(gòu)設(shè)計(jì)的主要手段。網(wǎng)殼結(jié)構(gòu)的非線性分析分析主要是通過結(jié)構(gòu)的荷載——位移非線性全過程曲線來研究。本文利用大型有限元分析軟件ANSYS,以正交正放局部雙層柱面網(wǎng)殼結(jié)構(gòu)為例,對局部雙層柱面網(wǎng)殼結(jié)構(gòu)的承載力及穩(wěn)定性進(jìn)行了研究??紤]了網(wǎng)格形式、不同的荷載形式、初始缺陷等影響因素的影響,對所得結(jié)果進(jìn)行統(tǒng)計(jì)、分析和歸納,得出了一系列對工程設(shè)計(jì)具有指導(dǎo)意義的結(jié)論。關(guān)鍵詞:局部雙層,柱面網(wǎng)殼,穩(wěn)定性,非線性,初始缺陷青島理工大學(xué)工學(xué)碩士學(xué)位論文ABSTRACTParticaldouble-layerreticulatedshellcyl
3、inderisspacereticulatedshell,itcallbeformationedbyincreaseingchordsandabdomenonsingleintersectedshellstructureinthelocaltobethemainstresssystem.Oraccordingtocertainrulesorsmokeondouble—layerreticulatedshells仃ucturepartschordandflankrod.Particaldouble-layerreticulatedshell
4、structureovercomethesingle-layerreticulatedshellstability,rods,materialstrengthnotadequately,atthesametime,relativetotheshortcomingsofdouble-layerreticulatedshellstructureisreasonable,thenumberofrodhastheadvantagesofsimplebeautifulappearance,ithasagoodapplicationprospect.
5、.Currently,bigspanreticulatedshellanalysismethodsincludelinearstaticanalysis,namelytheeigenvalueanalysisandconsiderincludingbucklinggeometricalnonlinearityandm缸erialnonlinearityofnonlinearanalysismethod.Thenonlinearmethodcanimitatethestressanddeformationoftheshellstructur
6、eexactly,itsaiaalysisresultsandthepracticalengineering,isrelativelyclosereticulatedshelldesign.Thenonlinearreticulatedshellismainlythroughtheanalysisofthestructure,loadcurvetostudynonlinearfull—rangedisplacement.Usingthelarge—scalefiniteelementanalysissoftwareANSYS,theort
7、hogonalcylinderisputlocaldouble-layerreticulatedshell,forexample,tolocaldouble-layerreticulatedshellcylinderbearingcapacityandstabilityisstudied.Consideringthe鰣dform,differentload,theinitialdefectseffectsform,theinfluenceoffactorsontheresultsofstatistics,analysisandinduct
8、ion,obtainedaseriesofguidingsignificanceforengineeringdesign.Keywords:Particaldouble,Cylindrical