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: Modal Characteristics of Linearly Tapered Reinforced Concrete Chimneys
Author(s): Wadi S. Rumman
Publication: Journal Proceedings
Appears on pages(s): 531-536
Keywords: bending moments;chimneys;dynamic loads; earthquakes; moments; reinforced concrete; shear properties; structural design; vibrations; wind pressure.
Abstract:Modal characteristics are important in calculating the response of chimneys to wind and seismic forces. Although first mode characteristics are relatively easy to obtain, the characteristics of higher modes involve extensive computations. The purpose of this paper is to establish coefficients for the periods and mode shapes of reinforced concrete chimneys and other cantilevered structures with hollow circular cross section that vary linearly in both mean diameter and thickness. These coefficients are used to obtain approximate values for periods and mode shapes for actual chimneys. Once the periods and mode shapes are knpwn, the modal shears and moments are easily obtained. The first, second, and third modes are considered.
Click here to become an online Journal subscriber