《结构动力学》课程教学课件（讲稿）01 Overview of structural dynamics（1/2）

Wuhan University of TechnologyDynamics of Structuresand Its EngineeringApplicationsWANGGuoboCHEN BO18086636508型###食免492852R02DGEABASwangguobo@whut.edu.cn1-1

1-1 Wuhan University of Technology Dynamics of Structures and Its Engineering Applications WANG Guobo CHEN Bo 18086636508 wangguobo@whut.edu.cn

Wuhan Universityof TechnologyChapter1Overview of Structural DynamicsRaH1-2

1-2 Wuhan University of Technology Chapter 1 Overview of Structural Dynamics

Wuhan University of TechnologyContents1.1Introduction1.2Types of dynamic loading1.3Destruction caused by dynamic loading1.4Essential characteristics of a dynamic problem1.5Contents and tasks1.6 Real application of structural dynamics1.7Contents of this course*1.8Books, references and words*1.9ReviewandProblems1-3

1-3 Wuhan University of Technology 1.1 Introduction 1.2 Types of dynamic loading 1.3 Destruction caused by dynamic loading 1.4 Essential characteristics of a dynamic problem 1.5 Contents and tasks 1.6 Real application of structural dynamics 1.7 Contents of this course＊ 1.8 Books, references and words＊ 1.9 Review and Problems Contents

Wuhan University of Technology1.1 Introduction-review打SmefoltvnStatics of structures is animportant course for结构力学教程（I）BE大肤鞋业维火号精器undergraduates.Whatkindsofloadsandstructural responses areconsidered点海机菜然社instaticsofstructures?《结构力学教程（I)》龙驭球等，高等教育出版社中###R#CA1-4

1-4 Wuhan University of Technology 1.1 Introduction-review  Statics of structures is an important course for undergraduates.  What kinds of loads and structural responses are considered in statics of structures? 《结构力学教程(I) 》 龙驭球等，高等教育出版社

Wuhan University of Technology1.1 Introduction-fundamentalobjectiveof structuraldynamics analysisThe primary purpose is to present methods for analyzing thestresses and deflections developed in any given type of structurewhen it is subjected to an arbitrary dynamic loadingThis objectivemaybe consideredtobean extensionofstandard methodsof structural analysis,whichgenerally areconcerned with static loading only, to permit consideration ofdynamic loading as wellThestaticloadingconditionmaybelookeduponmerely asaspecial form of dynamic loadingThestatic and dynamicmethods of analysis are fundamentallydifferent in character1-5

1-5 Wuhan University of Technology  The primary purpose is to present methods for analyzing the stresses and deflections developed in any given type of structure when it is subjected to an arbitrary dynamic loading.  This objective may be considered to be an extension of standard methods of structural analysis, which generally are concerned with static loading only, to permit consideration of dynamic loading as well.  The staticloading condition may be looked upon merely as a special form of dynamic loading.  The static and dynamic methods of analysis are fundamentally different in character. 1.1 Introduction￾fundamental objective of structural dynamics analysis

Wuhan University of Technology1.1 Introductionfundamental objective of structural dynamics analysisThe term dynamic may be defined simply as timevarying;A dynamic load is any load of which its magnitude, direction,and/or position varies with time.The structural responses to a dynamic load, i.e., the resultingstresses anddeflections,is also timevarying,or dynamic1-6

1-6 Wuhan University of Technology  The term dynamic may be defined simply as timevarying;  A dynamic load is any load of which its magnitude, direction, and/or position varies with time.  The structural responses to a dynamic load, i.e., the resulting stresses and deflections, is also timevarying, or dynamic. 1.1 Introduction￾fundamental objective of structural dynamics analysis

Wuhan University of Technology1.1 Introduction-fundamentalobjectiveof structural dynamics analysisTwo basically different approaches are available for evaluatingstructural response to dynamic loads: deterministic andnondeterministicThe choice of method to be used in any given case dependsupon how the loading is definedIf the time variation of loading is fully known, it will bereferred to as a prescribed dynamic loading.The analysis of theresponse of any specified structural systemtoaprescribeddynamic loadingisdefined as a deterministic analysis1-7

1-7 Wuhan University of Technology  Two basically different approaches are available for evaluating structural response to dynamic loads: deterministic and nondeterministic.  The choice of method to be used in any given case depends upon how the loading is defined.  If the time variation of loading is fully known, it will be referred to as a prescribed dynamic loading. The analysis of the response of any specified structural system to a prescribed dynamic loading is defined as a deterministic analysis. 1.1 Introduction￾fundamental objective of structural dynamics analysis

Wuhan University of Technology1.1 Introductionfundamentalobjectiveof structuraldynamicsanalysisIfthetimevariationisnotcompletelyknownbutcanbedefined in a statistical sense, the loading is termed a randomdynamic loading; and its corresponding analysis of response isdefined as a nondeterministic analysis.Theprincipal emphasisinthiscourseisplacedondevelopmentofmethodsofdeterministicdynamicanalysisCRRC9R1-8

1-8 Wuhan University of Technology  If the time variation is not completely known but can be defined in a statistical sense, the loading is termed a random dynamic loading; and its corresponding analysis of response is defined as a nondeterministic analysis.  The principal emphasis in this course is placed on development of methods of deterministic dynamic analysis. 1.1 Introduction￾fundamental objective of structural dynamics analysis

Wuhan University of Technology1.2 Types of dynamic loading -categorySinusoidal loadingPeriodicNon-sinusoidal loadingloadingDeterministicSudden loadsloadingNon-periodicOtherkindsofloadingDynamicdeterministicloadingloadingWind loadingEarthquakeNondeterministicImpulsiveloadingloadingOtherkindsofnondeterministic loadingC2R#R0C926700341-9

1-9 Wuhan University of Technology Dynamic loading Deterministic loading Nondeterministic loading Wind loading Earthquake Other kinds of nondeterministic loading Periodic loading Non-periodic loading Sinusoidal loading Non-sinusoidal loading Impulsive loading Sudden loads Other kinds of deterministic loading 1.2 Types of dynamic loading -category

Wuhan University of Technology1.2 Types of dynamic loading - categoryP(t) Sinusoidal loadingPeriodic loadingP(t) LImpulsive loadingImpulsiveloading1-10

1-10 Wuhan University of Technology P(t ) t P t Sinusoidal loading Periodic loading P t tr P P(t ) t t r P Impulsive loading T T T Impulsive loading 1.2 Types of dynamic loading - category