N°209. 1991. Vibration Problems in Structures - Practical Guidelines
This document is the work of an international Task Group V/4 'Vibrations ' of the former Commission V 'Serviceability ' initiated 1985 by the 'Comité EuroInternational du Béton (CEB)' .
The aim of the Task Group has been to create guidelines for the practical treatment of vibration problems in structures. The guidelines are aimed at practising structural and civil engineers who are mainly working in construction and environmental engineering but are not specialists in dynamics . For purposes of review and reference some basics of vibration theory and other important fundamentals are given in the appendices.
In the main parts of the guidelines, tool s are given to aid in decision making and to find simple solutions for cases of frequently occurring 'normal ' vibration problems . For more complicated problems and for more advanced solutions some further hints are given. In such cases these guidelines should d enable the practising engineer to proceed in the right direction for finding the appropriate solutions - for example, in the literature - and possibly assist him to communicate authoritatively with a dynamic specialist.
The guidelines deal mainly with serviceability problems of reinforced and prestressed concrete structures . In various parts, however, some safety problems are also addressed and ether types of structures, such as composite and steel structures, are treated.
Dynamic actions are considered from the following sources of vibration:
- human body motions
- rotating, oscillating and impacting machines
- wind flow
- road traffic, railway traffic and construction work
Earthquake-induced vibrations, impact problems, fatigue effects and also measurement techniques are not treated in these guidelines . These problems are treated extensively in the literature and also in the CEB Bulletins d' Information No. 165 'Model Code for Seismic Design of Concrete Structures ', May 1985 and No. 187 'Concrete Structures under Impact and Impulsive Loading ', August 1988 and No. 188 'Fatigue of Concrete Structures ', July 1988.
For an easier use of the guidelines each sub-chapter has a similar format and structure of content:
Problem description: General, Dynamic actions, Structural criteria, Effects on people and on structures Tolerable values, Simple design rules, More advanced design rules, Remedial measures
It is not intended that this document should replace relevant national codes. The present guidelines have been compiled so as to give more general rules and more general hints than are detailed in national codes. Whenever appropriate, however, codes and standards have been referenced for illustrative purposes. In addition, the International Standard ISO/DIS 10137 (1991) provides a complementary design guide for assessing vibration problems in buildings.
The former Commission V, having been dismissed in the meantime, this document has nevertheless been unanimously recommended by invited experts for presentation during the 28th CEB Plenary Session in Vienna, September 1991.
The Group hopes that this document will be a useful tool for practising engineers confronted with vibration problems. The Group will very much appreciate critical comments from professional colleagues with a view to making improvements in a later edition of these guidelines.
