L. Shahryari*
Science and Research Branch, Islamic Azad University, Fars, Iran [email protected] A. Kaveh Iran University of Science and Technology, Narmak, Tehran-16, Iran [email protected] *Corresponding Author ( Received: April 11, 2010 – Accepted: October 20, 2011 ) Abstract 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. Keywords Symmetry, multi-symmetry, trusses, decomposition, eigensolution, graph چکیده در این مقاله ناحیه ای که برای سیستم سازه ای در نظر گرفته شده است به چهار زیر ناحیه تقسیم می شود. بالا ، پایین ، چپ و راست . پس از تشکیل ماتریس سختی با استفاده از تقارنهای مستقیم و معکوس رابطه بین درایه های ماتریس سختی استخراج می گردد. مثالها جهت شرح و توضیح این روش بیان شده است
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