02873nam a2200253   450000500170000000800410001703500150005810000190007324500850009226000520017730000150022949000270024450001450027150200580041652017430047465000260221765000220224370000350226570000510230070000490235171000950240081000590249585600650255420260818144319.0230798         th                  eng    a.b103795381 aIrawan, Paulus10aInvestigation of confinement effects on concrete column by finite element method  aBangkok :bAsian Institute of Technology,c1991  a50, A-5 p.1 aThesis ;vno. ST-91-10  aA thesis submitted in partial fulfillment of the requirements  for the degree of Master of Engineering, School of Engineering and Technology  aThesis (M.Eng.) - Asian Institute of Technology, 1991  aMany 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. 0aFinite element method 0aColumns, Concrete1 aMaekawa, Koichi, eChairperson0 aWorsak Kanok-Nukulchai,eExamination Committee1 aKamol Vajarasathira, eExamination Committee2 aGerman Academic Exchange Service (DAAD),  Federal Republic of Germany, eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. ST-91-10  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B17703