| 논문명 |
Constitutive Model for a Confined Concrete Cylinder with an Unbonded External Steel Jacket |
| 수록사항 |
ARCHITECTURAL RESEARCH(대한건축학회 논문집), Vol.17 No.1 (2015-03) |
| 주제어 |
; Confined concrete ; Heterogeneity ; Steel Jacketing Method |
| 요약2 |
Early investigations focused mainly on manipulating the confinement effect to develop a reinforced concrete column with lateral hoops. Based on this legacy model, Li’s model incorporated the additional confinement effect of a steel jacket. However, recent experiments on plain concrete cylinders with steel jackets revealed relatively large discrepancies in the estimates of strength enhancement and the post-peak behavior. Here, we describe a modified constitutive law for confined concrete with an unbonded external steel jacket in terms of three regions for the loading stage. We used a two-phase heterogeneous concrete model to simulate the uniaxial compression test of a 150 mm × 300 mm concrete cylinder with three thicknesses of steel jackets: 1.0 mm, 1.5 mm, and 2.0 mm. The proposed constitutive model was verified by a series of finite element analyses using a finite element program. The damaged plasticity model and extended Drucker-Prager model were applied and compared in terms of the level of pressure sensitivity for confinement in 3D. The proposed model yielded results that were in close agreement with the experimental results. |
