000004763 001__ 4763
000004763 005__ 20141119144551.0
000004763 04107 $$aeng
000004763 046__ $$k2002-06-02
000004763 100__ $$aPrice, T. E.
000004763 24500 $$aDYNAMIC RESPONSE OF A LONG, DISCRETELY SUPPORTED BEAM

000004763 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference
000004763 260__ $$bColumbia University in the City of New York
000004763 506__ $$arestricted
000004763 520__ $$2eng$$aThis paper describes a computational model of a long beam resting on discretely-located flexible supports. The model is suitable for assessing certain types of vibrations in building floors, and for various aerospace and other applications. The model is a finite element model of an arbitrarily long Euler-Bernoulli beam, constructed using the mode shapes of a beam supported by a continuous foundation as basis functions. Thus, the model is efficient, and yields a numerically exact solution when the joist spacing is small (i.e., continuous). The beam configuration is completely described using a fundamental frequency, a characteristic length, and the distribution of the joist stiffnesses, as well as two damping ratios and a dimensionless rotatory inertia parameter. The model is then applied to vibration serviceability behavior of floors, a significant consideration in civil engineering design, which is becoming increasingly more important because of the use of lighter, higher strength steel and concrete. When a floor plate is geometrically regular and supported by identical, equally spaced joists or beams, vibration can propagate in the direction transverse to the joists. Such “vibration transmission” can lead to the perception of poor behavior. Exploiting the model's efficiency, vibration transmission is studied to determine the influence of characteristic length, and joist stiffness on floor response. Two response regimes are identified for the floor system. The practice of varying the stiffness distribution of the supporting joists as a vibration mitigation strategy is also assessed. 

000004763 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004763 653__ $$aVibration, Infinite Beam, Flexible Supports

000004763 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002
000004763 720__ $$aPrice, T. E.$$iShaaker, Mohsen
000004763 8560_ $$ffischerc@itam.cas.cz
000004763 8564_ $$s87629$$uhttps://invenio.itam.cas.cz/record/4763/files/305.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004763 962__ $$r4594
000004763 980__ $$aPAPER