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 Introductionfundamental 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 Introductionfundamental 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 Introductionfundamental 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