30487.基于lsdyna的新型棚洞板耗能減震分析

1、華中科技大學(xué)碩士學(xué)位論文基于LSDYNA的新型棚洞板耗能減震分析姓名：周繼云申請學(xué)位級別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：李振環(huán)2011華中科技大學(xué)碩士學(xué)位論文華中科技大學(xué)碩士學(xué)位論文IIAbstractGeologicaldisastersarecommoninwesternmountainousareasofourcountrywheremountaincollapserockfallsarealwaysinducedbyearthqu

2、akeslslidesdebrisflowothergeologicaldisasters.Thecostofdestructionofhighwaysbridgescausedbygeologicaldisastersisincreasingrapidlytheseyears.Therefeitisofgreatsignificancetostudytherockfallsprotectivestructures.Asalowcost

3、simpleeffectiveprotectivestructureagainstrockfallrockshedshavebeenusedmemewidelyusednowadays.AnewconceptofrockshedprotectionwasproposedbyTonelloI.C.Officein2001.Itconsistsofareinfcedconcreteslab(notcoveredbyanycushion)cy

4、lindricalshellsupptsdesignedtodissipatetheenergyofrockshittingontheedgeoftheslab.Lightthinwalledmetalstructureswerewidelyusedinhighspeedimpactasenergyabsbersbecauseofitslowcostgoodenergyabsptioncapacityreliability.Withth

5、edevelopmentmaturityofthecirculartubestudyscholarshaveproposedothersectiontubessuchassquarecrosssectioncrisscrosssectionavarietyofthinwalledcompositestructuressuchasincludingthedoublecylindricalshellfoamfilledstructures.

6、BasedonthetheyofdynamicexplicitFiniteElementMethod(FEM)LSDYNAprogramrelationshipbetweendefmationmodesenergyabsptionofthetubeunderaxialcrushingwaswellstudied.Onthatbasisthreedimensionedparametricstudiesonthenewrockshedsin

7、multipleloadcaseswereconducted.Thenumericalresultsshowthat：1、WiththesamelengthsamethicknesscrushingfcepeakofcrosstubessquaretubeswiththesameperimeterwaslargerthansquarecontainingcirculartubesAveragecrushingfceofcrosstube

8、ssquaretubeswassmallerthansquarecontainingcirculartubes.Thelatterhadbetterenergyabsptioncapacity2、Energyabsptioncapacityofthetubedependedonthedefmationmodethelengthdiameterratiodiameterthicknessratiohadsignificantinfluen