Design of Seismic Confinement of RC Columns Using Normal Strength Materials
Date Issued
2014
Date
2014
Author(s)
Lio, Un I
Abstract
In a metropolitan area with a high population density, construction of high-rise buildings for residential purpose is a necessity especially for urban renewal. While lower-story columns sustain higher self-weight above, it means higher axial load caused by high-rise building.When normal strength concrete is used, the large dismension columns are required which hampers the function of building. The use of high strength concrete can effeitively reduce the column dimension but the brittleuess of high strength concrete should be safety regarded.
Both the high axial loads and the high strength concrete will reduce the seismic deformation capacity of columns. How to overcome the problem is an important issue. According the past experience, we can improve the deformation capacity of column by adding more confinement steel or use of the seismic hook.
Current column provisions on confinement in ACI 318-11 code do not necessarily ensure adequate deformation capacity. Therefore, the revision of design equation for seismic confinement is the main objective of this research. National Center for Research on Earthquake Engineering proposed an equation for column confinement design in 2013. It can ensure the seismic deformation capacity for the high strength column subject & high axial loads. Applicability of the NCREE equation on the normal strength column is still unknown. In addition, ACI 318-14 is also available. In order to verify the NCREE design equation and ACI 318-14 for Column Confinement RC, this study tested 6 specimens of normal strength columns subjected to high axial loads, and proposed a design equation for column confinement.
Subjects
鋼筋混凝土柱
普通強度
高軸力
圍束
變形能力
設計公式
Type
thesis
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