tr 43 post tensioned concrete floors design handbook

#TR 43 POST TENSIONED CONCRETE FLOORS DESIGN HANDBOOK HOW TO#

The force of vibration depends on the weight and walking style of the individual and is a fraction of the individual s weight. In the absence of more detailed information, a walking frequency of Hz is recommended. For low height partitioned office spaces and labs, 1.8 Hz is more appropriate. For an open plan office, an upper limit of.1 Hz is acceptable. Walking rates (foot drops) above.5 Hz are uncommon so this is a reasonable upper limit for the design of corridors and large circulation areas. VIBRATION SOURCE This Technical Note considers vibration source from foot drop of walking individuals. Damping cannot be calculated as such, and must always be assessed based on experience with floors of similar construction. Due to the variable nature of the parameters that determine the response of a floor system, such as damping, this procedure is valuable for a first design estimate. This Technical Note presents a simplified procedure based on the Response Calculation Method. Response Calculation Method, a performance-based method focuses on determining the likely vibration response of a floor under the application of a dynamic force from walking. Frequency Tuning Method sets the natural frequency of a floor system above frequencies susceptible to resonating when excited by the lower harmonic of walking forces. Ltd, Kolkata, India, Tel: Fax:Ģ Two methods are frequently employed.

#TR 43 POST TENSIONED CONCRETE FLOORS DESIGN HANDBOOK HOW TO#

The following factors must be identified at initiation of design: The vibration source The vibration transmission path (mass, stiffness, damping) What vibration can be perceived and is objectionable How to determine the vibration characteristics of a floor at design stage How to determine whether or not the vibration response is acceptable 1 Copyright ADAPT Corporation 008 Professor Emeritus, San Francisco State University Principal, ADAPT Corporation ADAPT Corporation, Redwood City, California, USA, Tel: (650) Fax (650) ADAPT International Pvt.

In addition to the uncertainties inherent in material properties, damping characteristics, and boundary conditions, the level of vibrations perceived by individuals, the vibration that is considered objectionable, and the force and frequency of foot drop are all highly subjective and prone to large variations. The difficulty in vibration design is the poor correlation between the outcome of computations at the design stage, and the response of the floor constructed accordingly. Detailed and rigorous computational tools are available to analyze vibration and response of both simple and complex structures. OVERVIEW The analytical background of vibrations is well developed and understood. SCOPE In general, the vibration response of a concrete floors is attributed to: Consequence of foot drop in residential and commercial floors Rhythmic vibration, such as in dance and sport events Vibration in laboratories manufacturing facilities Vibrations due to vehicular traffic outside a facility Vibrations due to operation of machinery Transient impulse due to earthquake, wind or other impact loads The focus of this Technical Note is design for vibration in residential and commercial buildings, due to foot drop of walking occupants. The Technical Note includes several numerical examples to illustrate the application of the procedures presented. The objective is to determine whether a floor meets the serviceability requirements for vibration using conservative values, or whether a more detailed analysis is warranted. 1 Your Partner in Structural Concrete Design TN90_vibrationbs_floor_ VIBRATION DESIGN OF CONCRETE FLOORS FOR SERVICEABILITY 1 Bijan O Aalami This Technical Note covers the design of concrete floor systems for vibration, with an emphasis on simple and expeditious first estimates for a floor s vibration response.

Tr 43 post tensioned concrete floors design handbook