工程力学毕业设计

本科毕业论文题目：基于ansys钢结构在地震波激励下的动态分析学院:理学院专业:工程力学学号:201007152012学生姓名:卢超超指导教师:龚相超日期:二〇一四年六月武汉科技大学本科毕业论文I摘要在建筑结构中，钢结构具有抗震性能高、工业化生产程度高、施工周期短、节能环保、便于运输、施工速度快、延展性好等优点，特别是钢结构建筑所具有的延展性可以衰减地震波，减少地震对建筑的破坏性。近些年来，地质灾害频发，地震引起的结构倒塌破坏越来越引起人们的关注。本文在理论分析的基础上，通过室内实验和数值模拟，主要进行了以下几个方面的工作:本论文以刚架结构为研究对象，对结构建立不同的简化模型，和不同的方法研究其在地震波激励下的动态响应分析。通过模态分析，得到钢结构水平振动的前十个振型和相应的固有频率。在输入地震波的情况下，采用瞬态动力学分析技术，确定了结构的动力响应。通过ansys软件进行仿真分析，同理论分析进行比较，从而对结构在地震分析中的一些常规方法有一个全面的理解。关键词:钢结构；地震波；动力响应；瞬态分析武汉科技大学本科毕业论文IIAbstractInbuildingstructure,steelstructurehashighshockresistantperformance,highdegreeoftheindustrialization,theconstructionperiodisshort,energysavingandenvironmentalprotectionadvantages,convenienttransportation,fastconstructionspeed,goodductility,especiallytheductilityofsteelstructurecanreducetheattenuationofseismicwaves,destructiveearthquakesonbuildings.Inrecentyears,geologicaldisasters,collapsecausedpeople'sconcernmoreandmorestructurecausedbytheearthquake.Inthispaper,onthebasisoftheoreticalanalysis,throughtheindoorexperimentandnumericalsimulation,themainworkissummarizedasfollows:inthisthesis,therigidframeastheresearchobject,asimplifiedmodelofthestructureisdifferent,anddifferentmethodstostudytheseismicwavedynamicresponseanalysis.Throughthemodalanalysis,getthehorizontalvibrationofsteelstructureofthefirsttenfrequenciesandcorrespondingnatural.Intheinputearthquakewaves,thetransientdynamicsanalysis,thedynamicresponseofthestructure.ThesimulationanalysisbyANSYSsoftware,withthetheoreticalanalysis,inordertohaveacomprehensiveunderstandingofsomeconventionalmethodsinseismicanalysisofstructure.Keywords:Steelstructure;Seismicwave;Dynamicresponse;Transientanalysis武汉科技大学本科毕业论文III目录1绪论......................................................................................................................................11.1研究的目的及意义...................................................................................................11.2国内外研究现状.......................................................................................................11.3存在的问题和不足...................................................................................................11.4主要研究内容...........................................................................................................22基本理论..............................................................................................................................22.1模态分析...................................................................................................................22.1.1模态分析定义与目的....................................................................................22.1.2模态分析基础理论........................................................................................22.1.3模态提取方法.................................................................错误!未定义书签。2.1.4模态叠加方法................................................................................................42.1.5模态分析步骤................................................................................................42.2瞬态动力分析...........................................................................................................52.2.1瞬态分析定义与目的.....................................................错误!未定义书签。2.2.2瞬态分析理论................................................................................................52.2.3瞬态分析步骤.................................................................错误!未定义书签。3钢结构模型的模态分析......................................................................................................63.1建立有限元模型.......................................................................................................63.1.1模型数据介绍................................................................................................63.1.2单元选择与介绍............................................................................................73.1.3建立模型........................................................................................................93.2钢结构的模态分析.................................................................................................103.3分析与结论.............................................................................................................124钢结构模型的瞬态分析....................................................................................................124.1引言.........................................................................................................................124.2荷载介绍.................................................................................................................124.3求时程曲线.............................................................................................................134.4瞬态分析最大响应.................................................................................................154.5结构响应结果.........................................................................................................175分析与结论..................................................................................................................