Title: Technique for Measuring the Interface Confining Stress in Concrete-Filled Steel tubes: Hydraulic analogy

Author(s): R. Y. Miao and W. H. Yang

Publication: Symposium Paper

Volume: 143

Issue:

Appears on pages(s): 145-165

Keywords: cores; experiments; hydraulics; reinforcing steels; steel tubes; stresses; Structural Research

DOI: 10.14359/4583

Date: 5/1/1994

Abstract:
The interface confining stress between steel tube and core concrete is an important problem in the analysis of the behavior of concrete-filled steel tubes. However, no satisfactory experimental method to measure the interface stress directly has been developed because of the peculiar geometry of concrete-filled steel tubes. In this study, the significance of measuring interface stress is discussed, and the use of hydraulic analogy, or analogous hydraulically loaded control specimens, is introduced. In this paper, the fundamental mechanism, instrumentation, and procedure of hydraulic analogy will be described in detail together with examples.