03509nam a2200397 4500 20260818144319.0 230798 th eng .b10379538 AIT Thesis no.ST-91-10 Irawan, Paulus Investigation of confinement effects on concrete column by finite element method Bangkok : Asian Institute of Technology, 1991 50, A-5 p. Thesis ; no. ST-91-10 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology Thesis (M.Eng.) - Asian Institute of Technology, 1991 Many investigations of confined concrete column have already been conducted in the past. However, since almost all investigations in the past are based on experiments alone, which do not give a clear understanding of mechanism of confined concrete column and are not unified, analytical study of the mechanism of confined concrete column was conducted by using three-dimensional Finite Element Analysis. The results fell between those from the formulations proposed by other researchers. Some experimental investigations were also conducted to verify the concrete material model and the result from Finite Element Analysis for steel-encased concrete columns. Three influencing factors to the strength and ductility, namely shape of lateral tie, volumetric ratio of lateral reinforcement to concrete core, ratio of spacing of lateral reinforcement to the width of concrete core, were studied. Three types of lateral reinforcement shape, circular tie, rectangular with cross tie and rectangular without cross tie, were studied. The circular tie is the most effective, and rectangular without cross tie is the least. The increment of volumetric ratio of lateral rein forcement to concrete core does not necessarily increase the strength and ductility of confined concrete column. It depends on the stress condition in the ties. The ratio of spacing of lateral reinforcement to the width of concrete core affects the strength and ductility in longitudinal and lateral directions. The smaller the ratio, the greater the confinement that can be mobilized to cross section far from lateral reinforcement and also the greater the mean stress level in the ties. Once the ties yield, strength and ductility increments will decrease. Finite element method Columns, Concrete Maekawa, Koichi, Chairperson Worsak Kanok-Nukulchai, Examination Committee Kamol Vajarasathira, Examination Committee German Academic Exchange Service (DAAD), Federal Republic of Germany, Scholarship Donor Asian Institute of Technology. Thesis ; no. ST-91-10 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B17703 .b10379538 mnait s 240402 2 951012 m a s 0 mnait mnarc 22 40 Barcode : 30050120692313 CREATED : 2014-02-04 RECORD # : i12786329 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160022629 CREATED : 2016-04-04 RECORD # : i12922171 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 64671 64671 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.ST-91-10 30050120692313 2026-08-18 14:43:19 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.ST-91-10 30050160022629 2026-08-18 14:43:19 1 2026-08-18 40