简介：在这研究，一个新lumped-mass-stick模型(LMSM)基于象特征值和特徵向量那样的结构的形式的特征被开发。简化模型，把频率称为适应lumped-massstick模型，hasonly棍子元素和节点到的一个小数字提供结构的一样的自然频率并且被用于一座原子抑制大楼。调查LMSM的数字表演，时间历史分析在LMSM和有限元素模型上被执行(女性)为一座原子抑制大楼。结果的比较证明LMSM的动态回答与FEM的那些以排水量和加速几乎相同。另外，结果也以在某些举起的floor反应系列在好同意。

简介：Thispaperreportsstick–slipbehaviorsofIndiangabbroasstudiedusinganewlarge-scalebiaxialfrictionapparatus,builtintheNationalResearchInstituteforEarthScienceandDisasterPrevention(NIED),Tsukuba,Japan.Theapparatusconsistsoftheexistingshakingtableastheshear-loadingdeviceupto3,600kN,themainframeforholdingtwolargerectangularprismaticspecimenswithaslidingareaof0.75m2andforapplyingnormalstressesrnupto1.33MPa,andareactionforceunitholdingthestationaryspecimentotheground.Theshakingtablecanproduceloadingratesvupto1.0m/s,accelerationsupto9.4m/s2,anddisplacementsdupto0.44m,usingfourservocontrolledactuators.Wereportresultsfromeightpreliminaryexperimentsconductedwithroomhumidityonthesamegabbrospecimensatv=0.1–100mm/sandrn=0.66–1.33MPa,andwithdofabout0.39m.Thepeakandsteady-statefrictioncoefficientswereabout0.8and0.6,respectively,consistentwiththeByerleefriction.Theaxialforcedroporshearstressdropduringanabruptslipislinearlyproportionaltotheamountofdisplacement,andtheslopeofthisrelationshipdeterminesthestiffnessoftheapparatusas1.159108N/mor153MPa/mforthespecimensweused.Thislowstiffnessmakesfaultmotionveryunstableandtheovershootingofshearstresstoanegativevaluewasrecognizedinsomeviolentstick–slipevents.Anabruptslipoccurredinaconstantrisetimeof16–18msdespitewidevariationofthestressdrop,andanaveragevelocityduringanabruptslipislinearlyproportionaltothestressdrop.Theuseofalarge-scaleshakingtablehasagreatpotentialinincreasingthesliprateandtotaldisplacementinbiaxialfrictionexperimentswithlargespecimens.