Here is my paper for the "Concrete & Concrete An international journal".
it took me long time, since July to do analysis and from 3 weeks ago to write it down.
Tomorrow , i'll submit to my supervisor and hope i can post soon.
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ELASTO-PLASTIC BEHAVIOR OF REINFORCED CONCRETE COOLING TOWER BASED ON RING-TYPED LATTICE MODEL UNDER DYNAMIC ANALYSIS
ABSTRACT: This study reports details the elasto-plastic nonlinear behavior of a reinforced concrete cooling tower, more than 150m tall, supported at a lower lintel by columns, under cyclic loads of earthquake motion. Based on Lattice Model as the constitutive equations for concrete, the analysis considers the effects of cracks and tension stiffening due to tension, and crash due to uni- and bi-axial compressions of concrete as well as yielding of reinforcement. The analysis is based on isoparametric shell elements modeling with 9-note Heterosis element for the shelled plane and fiber element for the circular stiffening rings at the top and lower cornices, columns and footing ring. Furthermore the concrete shell elements are divided into many layers and the steel reinforcing bars are also replaced with thin sheets. As the result of the analysis, the elasto-plastic behavior of cooling tower under static weight loading together with earthquake motion is being made clear. With these behaviors the suggestion for the designation of cooling tower could have been drawn and the earthquake resistant ability of such structure is being estimated.
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