Behavior and Application of Multi-Spiral Confined Reinforced Concrete Columns
Date Issued
2012
Date
2012
Author(s)
Wu, Tzu-Liang
Abstract
Reinforced concrete is the mostly common used material in civil engineering construction. Because such materials are easy to get, it owns excellent compressed performance and becomes a ductile structural member composited with reinforcement bar. Samuel Yen-Liang, Yin first invent the Yin’s Spiral, which is the confined reinforcement composed of five spirals, to confine a square sectional column instead of rectilinear hoop. Many researchers have finished pure axial compression tests, cyclic tests of Yin’s Spiral and found its performance is more excellent than rectilinear hoop in strength, ductility and economy. In this document proposes a definition for multi-spirals.
Compared to rectilinear hoop the few researches and developments make it necessary to pay more efforts such as the constitutive law, design method, reinforcement detailing, behavior applied to oblong and rectangular section, behavior applied to bridge column, the design method for using high strength materials and mechanism of shear behavior. In this document also gives the comparison of finite element analysis software between ATENA and XTRACT.
According to this study, multi-spirals reinforcement owns not only an excellent performance in a square section column but also for oblong and rectangular section. In this document proposes a constitutive law for multi-spirals reinforcement which gives two major characteristic assumptions to modify Mander’s proposed stress-strain law. The prediction is satisfied. Also, the buckling model of longitudinal bar and detailing designation method are proposed reasonably.
Subjects
multi-spirals
confined
intersection
ductility
bridge pier
Type
thesis
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