Design of Seismic Confinement of RC Tied Columns
Date Issued
2016
Date
2016
Author(s)
Tsai, Wan-Ting
Abstract
Reinforcement concrete structure is the major building system in Taiwan. In metropolitan area of Taiwan with a high population deansity, construction of high-rise buildings for residential purpose is a necessity. It leads to very high axial load in the lower story columns. Moment resisting frames is often used to resist earthquake in Taiwan. This system behaves well during earthquake, since they have the strong-column weak-beam assemblages to dissipate the energy. Flexural yielding should occur at both ends of beams, and column ends at base can be yielded at final stage. To sure this mechanism in ductile manner, the columns should be well confined. Current column provisions on confinement in Taiwan code, similar to ACI 318-11code, the influence of high axial force on reducing deformation capacity is not concidered. Recently, ACI 318-14 requires a increased confining reinforcement for column with higher axial load. In addition, ACI requires that all the column longitudinal bars be engaged with seismic hooks when column axial load is high. Due to the limited accessibility of construction facilities, the provisions to use seismic hooks for both end of cross-ties are difficult to follow in Taiwan. Due to this problem of the construction in Taiwan, the purpose of this study is to investigate the applicability of the crosstie with a seismic hook at one end and a 90-degree hook at the other end. Total of 8 column specimens were tested in this study, and the use of crosstie with a 90-degree hook at one end is allowed.
Subjects
columns
column confinement
high axial load
lateral deformation
crosstie detail
Type
thesis
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ntu-105-R03521223-1.pdf
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