6897 (ISO International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION·MEKAYHAPOAHAA OPIAHW3AUWA NO CTAHAAPTW3ALWMORGANISATION INTERNATIONALEDE NORMALISATION Guidelines for the evaluation of the response of occupants of fixed structures, especially buildings and off-shore structures, to low-frequency horizontal motion (0,063 to 1 Hz) Guide pour I'évaluation de la reponse des occupants de structures fixes, en particulier de batiments et de structures en mer, a un mouvementhorizontaldebassefrequence(0,063a1Hz) First edition - 1984-08-15 UDC 534.831 : 69 Ref. No. ISO 6897-1984 (E) ISO 6897-1983 (E) Descriptors : buildings, vibration, humans, human body, frequency responses, , frequencies, verylow frequencies, measurement. Price based on 8 pages Copyright International Organization for Standardization ense from IHS Not for Resale Foreword iSO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of developing International and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 6897 was developed by Technical Committee ISO/TC 108 Mechanical vibration and shock, and was circulated to the member bodies in April 1982. It has been approved by the member bodies of the following countries : Australia France Romania Belgium Germany, F. R. South Africa, Rep. of Czechoslovakia Hungary Spain Denmark Italy United Kingdom Egypt, Arab Rep. of Netherlands USA The member body of the following country expressed disapproval of the document on technical grounds : Japan International Organization for Standardization, 1984 . Printed in Switzerland Copyright International Organization for Standardization Not for Resale d without license from IHS INTERNATIONAL STANDARD ISO 6897-1984 (E) Guidelines for the evaluation of the response of occupants of fixed structures, especially buildings and off-shore structures, to low-frequency horizontal motion (0,063 to 1 Hz) 0 Introduction Often the likely motion of a planned structure has to be calculated in order to assess the probable response, to the Until this century, buildings were seldom more than a few vibration, of those who will use the structure. The probable motion of a proposed structure can generaly be found by storeys high and the few tall buildings which did exist were usually of a heavy gravity design which did not readily respond structural dynamics using the structure stiffness and mass, the to wind or other forces. Also, tall buildings constructed in the wind or wind and wave spectra, the structure shape, aspect late nineteenth century and early this century generally had ver- ticai load-bearing frames with massive granite infills which pro- Wind tunnel and wave tank studies using aerodynamic and vided another generation of unresponsive buildings. fluid dynamic models can also be used to determine the likely motion of structures This history of unresponsive building structures has led people In some forms of tall building construction, poor construction to expect buildings to provide nearly stationary accommoda- joints allow inter-storey drift in the structure and, when assess- tion, even under storm conditions, and the occupants of ing the probable response of such structures, an allowance buildings are prepared to accept only extremely low levels of should be made for the effects of inter-storey movements. motion. Guidance on satisfactory magnitudes of vibration for specific In contrast to these unresponsive structures, more modern situations is given in the annex. buildings have tended, for reasons of economy of space, foun- dation requirements, material outlay, speed of erection and Scope and field of application 1 elegance, to be formed from more slender sections such that