A Kaveh - Centre of Excellence for Fundamental Studies in Structural Engineering,Iran University of Science and Technology, Narmak, Tehran-۱۶, Iran
L Shahryari - Centre of Excellence for Fundamental Studies in Structural Engineering,Iran University of Science and Technology, Narmak, Tehran-۱۶, Iran

In this paper, the region in which the structural system is situated is divided into four subregions, namely upper, lower, left and right subregions. The stiffness matrix of the entire system is then formed and using the existing direct symmetry and reverse symmetry, the relationships between the entries of the matrix are established. Examples are included to illustrate the steps of the method.

multi-symmetry, trusses, decomposition, buckling load, graph