Gived some suggestions to the improved degree of moment augment factor of column in Code for Seismic Design of Buildings,in order to reduce the probability of column hinge.

The theory and the survey from the disaster in Wenchuan Earthquake show that valuing moment augment factor of column according to the criterion isn\'t enough to certify for the target to‘Strong Column and Weak Beam\'.

The efficiency analysis of moment magnification factor at ends of columns of a frame;

As a geometric nonlinearity analysis example in non-perfect system,this paper applies the analytical method to solve moment magnification factor of the eccentric compression bar,and uses structure instability judgement criterion of analytical method for the stability analysis.

Based on the non-linear analysis method, the moment magnification of concrete and masonry piers is calculated, and affecting behavior of every primary factors is analysed, A calculating formula of the moment magnification ratio for designing is established.

Based on the practical stress-strain relation of the materials,the moment magnification ratio of concrete and masonry piers is calculated,by use of the non-linear analysis method,in the present paper.