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It’s clearly obvious that the use of computer progr ams, especially finite element method in structural analysis, gained a dis tinguished popularity in the presence of expensive hard experimental works i n the field of concrete structures, modeling with a proper finite element p rogram in idealization the considered structure is greatly needed. Today, the us of shotcrete for strengthen of the concrete structures in large scal e is increasing due to it's advantage, the properties and the factors effect on it, has been discussed. This work presents an theoretically investigation c oncerning the efficiency for the reinforced concrete columns Four Columns (2 0x20x100) were tested under compression loading and had the same cross s ection of dimensions and main longitudinal reinforcement distribution an d cross sections for all columns. (Usama 2002) made four Columns (20x20x100) were tested under compression loading and The deformations were measu r d by linear variable differential transducers LVDT’s, two trans ducers in both sides to measure the longitudinal deformations ( LO ) and th ree in the lateral direction to measure the lateral deformations: the first (EQ1) was near the end of the column, the second (EQ2) was in the midd le and the third (EQ3) was in the middle between the fist and the secondha d the same cross section of dimensions and main longitudinal reinforcement d istribution and cross sections for all columns. These Columns had four de formed longitudinal steel bars 10 mm diameter. New formula in the three dimensional for numerical modeling to compare between strengthenin g columns [5] was produced by the author.

A NUMERICAL INVESTIGATION FOR ANALYSING REINFORCED CONCRETE COLUMNS STRENGTHENED WITH SHOTCRETE