Study on the Confining Effect of Reinforced Concrete Columns Using High Strength Materials
Date Issued
2010
Date
2010
Author(s)
Chang, Feng-Chan
Abstract
In common building structures, columns play important roles as vertical and lateral load carrying members. For some columns of high rise buildings, especially those located at the lower parts, the effect of axial load becomes more dominant, causing a huge size in dimension if designed using normal strength materials. However, due to the development of high strength materials, such as high strength concrete and high strength steel, engineers can now yield a more efficient and economical design of columns.
Based on the current available research on high strength columns, most of the experimental work was related to the testing of reduced-scale specimens due to the limited testing capacity of the laboratory. This thesis focuses on the experimental study of 5 full-scale specimens (600×600 mm) of high strength columns subjected to quasi-static cyclic loading under constant high axial load, which is made executable because of the availability of MATS (Multi Axial Testing System) in National Center Research on Earthquake Engineering (NCREE), Taiwan.
The main purpose of this research is to clarify the size effect, as well as to study the confinement effect and lateral load carrying capacity of reinforced concrete columns with high strength concrete (70, 100 MPa) and reinforced with high yielding strength reinforcement bars, 685 MPa and 785 MPa for column longitudinal and transverse reinforcement bars, respectively. Finally, a verification of the applicability of existing ACI 318-08 code design equation is also evaluated.
Subjects
column
confinement
high-strength concrete
high-strength reinforcement
high axial load
double curvature
lateral force
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