In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
ACI World Headquarters
38800 Country Club Dr.
Farmington Hills, MI
ACI Middle East Regional Office
Second Floor, Office # 02.01/07
The Offices 02 Building, One Central
Dubai World Trade Center Complex
Phone: +971.4.516.3208 & 3209
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Structural Serviceability Under Dynamic Loading
Author(s): A. Farah
Publication: Symposium Paper
Appears on pages(s): 419-434
Keywords: concrete slabs; dynamic loads; floors; high-rise
buildings; human factors engineering; models; reinforced concrete;
Abstract:The serviceability of structures such as floors and tall buidlings to dynamic loading is assessed in terms of absorbed power which is the rate of energy dissipation through a standard biomechanical model simulating the human user of the structure. Design formulae and curves were developed to assist the engineer in assessing structural serviceability of existing structures and that of structures at the design stageforperiodic and transient vibration. Abstract: Some structures vibrate perceptibly when subjected to service dynamic loads. The serviceability of such structures which include floors and tall buildings is dependent upon the imposed excitations and the characteristics of the structure such as frequency, stiffness and damping. However, structural design practice has been dominated by deflection requirements limiting the live load deflection or the span to depth ratio of the main girders. These restrictions represent essentially static criteria and thus are not adequate to provide for proper serviceability under dynamic loading. It is to be noted that the loads producing disagreable vibrations are usually different in type and intensity from the design live loads and are only a small proportion of such loads. The objective of this paper is to present 'objective' criteria based on the response of the human user, for evaluating the structural serviceability of floors and tall buildings relative to vibrations in the vertical and fore-and-aft modes. These criteria, developed to deal with periodic and transient vibrations, are expressed in terms of the human response and the major characteristics of the structure. Based on the above criteria, design curves in terms of stiffness, frequency, mass and damping were produced to assist the engineer in arriving at a design satisfying both the strength and serviceability requirements. Furthermore, the serviceability of forty floors and tall buildings was assessed using these criteria. The loading on the floors included impact loads, excitations due to human walking and high-heel impact and the forces resulting from other human activity such as dancing which may produce resonance. The results indicate excellent agreement with the reported sub-jective ratings.
Click here to become an online Symposium Papers subscriber
Please enter this 5 digit unlock code on the web page.