The effect of stress, frequency, curing, mix and age upon the damping of concrete

Author:

Jordan R. W.1

Affiliation:

1. Central Electricity Research Laboratories

Abstract

Synopsis The results of an investigation to study the effect of stress, frequency, curing, mix and age upon the damping of concrete are presented. The chosen factors were considered to be of greatest importance in determining the level of dumping in multi-flue chimneys and cooling towers under wind excitation. Each factor was considered at only two values or levels, to cover the range of interest, but each factor was studied at both levels of the other factors to form a factorial experiment. The data were then analysed statistically to identify the significant factors and interactions between factors. An attempt has been made to explain the observed changes in damping in term of three components; a coulomb damping component associated with microcracking, a hysteretic or solid dumping component associated with sliding friction within the solid gel structure and a viscous damping component associated with moisture movement. For the range of values of the factors studied, the component associated with micro-cracking was the most dominant, especially in dry concrete.

Publisher

Thomas Telford Ltd.

Subject

General Materials Science,Building and Construction,Civil and Structural Engineering

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