EFFECTIVE LENGTH OF THE COMPRESSION MEMBERS WITH RESPECT TO THE DEGREE OF END RESTRAINT AND THEIR THEORITICAL AND RECOMMENDED VALUE OF THE EFFECTIVE LENGTH (COLUMNS) .

EFFECTIVE LENGTH OF THE COLUMNS:-- In the case of non availability of more exact analysis, the effective length of columns in framed structure it may be obtained from the ratio of effective length to unsupported length L ef /L when the relative displacement of the ends of the columns is prevented and in the case when relative displacement of the ends of the column is prevented it is recommended that the effective length ratio L ef /L may not be taken to less than 1.2 . The effective length ratios for a column in a frame with no sway and in the case of without restraint against away the said usage of the assumption are based on the end conditions and reproduced from the Structural Engineering Volume 52 -1974 with the permission of the council of the institution of Structural Engineers ,U.K .The effective length of the compression members has been recommended 0.65 L as mentioned theorititical value of the length 0.5 L and in the case of effectively held in position at both ends , restraint against rotation at one end recommendations are made 0.80 L instead of 0.7L .In case of effectively held in position and restrained against the rotation at one end, and at the other restrained against rotation but not held in position the recommendations are 1.20 L instead of L where in the L is the unsupported length of compression member and in other cases the recommendation of the theoritical value of the effective length and the recommendations made for the compression members will be the same.