简介：

简介：在开展桥梁、房屋、网壳、网架等杆系结构几何非线性分析或极限承载力计算时，需要空间梁单元的切线刚度矩阵。基于非线性问题的一般平衡方程和空间梁单元的非线性几何方程，推导应力应变一般线弹性关系下的空间梁单元显式切线刚度矩阵，该刚度矩阵中包含了由初应力和初应变产生的初应力刚度矩阵，为空间有限元程序的编制奠定了基础。

简介：根据有限元理论,借助通用有限元程序,对单跨吊桥的结构性能进行了空间非线性分析,并依此得出了有关影响单跨吊桥结构刚度的因素.

简介：简要介绍了运用I-DEAS软件对CPG500型铺轨机组作业车车体结构的静强度、刚度进行有限元分析。

简介：本文通过力学知识与有限元分析的结合对铁路桥墩水平线刚度进行检算

简介：Acomplianttowerismodeledasapartiallydry,partiallytapered,dampedTimoshenkobeamwiththesuperstructuremodeledasaneccentrictipmass,andanon-classicaldampedboundaryatthebase.Thefoundationismodeledasacombinationofalinearspringandatorsionalspring,alongwithparallellinearandtorsionaldampers(Kelvin-Voigtmodel).Thesuperstructureaddstothekineticenergyofthesystemwithoutaffectingthepotentialenergy,therebyreducingthenaturalfrequencies.Theweightofthesuperstructureactsasanaxialcompressiveloadonthebeam,reducingitsnaturalfrequenciesfurther.Theemptyspacefactorduetothetruss-typestructureofthetowerisincluded.Theeffectofsheardeformationandrotaryinertiaareincludedinthevibrationanalysis;withthenon-uniformbeammode-shapesbeingaweightedsumoftheuniformbeammode-shapessatisfyingtheendcondition.TheweightsareevaluatedbytheRayleigh-Ritz(RR)method,andverifiedusingfiniteelementmethod(FEM).Theweightofthesuperstructureactsasanaxialcompressiveloadonthebeam.Kelvin-Voigtmodelofstructuraldampingisincluded.Apartofthestructurebeingunderwater,thevirtualaddedinertiaisincludedtocalculatethewetnaturalfrequencies.Aparametricstudyisdoneforvariousmagnitudesoftipmassandvariouslevelsofsubmergence.ThecomputationalefficiencyandaccuracyoftheRayleigh-Ritzmethod,ascomparedtotheFEA,hasbeendemonstrated.Theadvantageofusingclosed-formtrialfunctionsisclearlyseenintheefficacyofcalculatingthevariousenergycomponentsintheRRmethod.