СОВРЕМЕННЫЕ МЕТОДЫ И РАСЧЕТЫ СТРОИТЕЛЬНЫХ КОНСТРУКЦИЙ, ОСНОВАНИЙ И ФУНДАМЕНТОВ DIFFICULTIES FOR DETECTING THE SINGULAR POINTS WITH COMMERCIAL PROGRAMS IN SPACE STRUCTURE AND A METHOD FOR DETERMINING THE REAL CAPACITY OF THE STRUCTURES A. Heidari1, V.V. Galishnikova1, I. Mahmoudzadeh Kani2 1Department of Building Structures and Constructions Engineering faculty Peoples Friendship University of Russia Ordshonikidze str., 3, Moscow, Russia, 115419 2Tehran University College of Engineering,University of Tehran, Enghelab Ave. Tehran, Iran For design purposes, the stability of any structure being designed is of paramount importance. <...> The secondary paths, especially in unstable buckling can play the most important role in collapse of the structure [2]. <...> In order to provide the desired benchmark, the complete theory and the exacl soulution for the nonlinear deformation and the stability of a regular tripod subjected to a load which acts in the direction of its axis of symmetry is presented in this work [1]. <...> In this paper the dificulies for analysis the space structure in detecting the singular point and obtaining the real load carying capacity of these structures has been investigated and finaly a method for overcome to this problem has been presented. <...> The numerical predictions in presented method has been verified with analytical soulotion in a space truss and and Laboratory results in a space frame. <...> Key words: Space Structure, Singular Point, Eigenvalue Buckling Analysis, Post Buckling Analysis. <...> The list includes products such as ABACUS, ADINA, ALADDIN, ANSYS, COSMOS, DYNA, FRAME3D, GT STRUDL, LIRA, 100 Heidari A., Galishnikova V.V., Mahmoudzadeh Kani I. Difficulties for detecting the singular points. <...> Commercial software package for nonlinear stuctural analysis contain user manuals that explain the steps of nonlinear analysis, but generaly assume that the user is familiar with the theory on which the analysis is based. <...> Nonlinear structural analysis is far less standardised than linear analysis, where the assumption that the engineer is familiar with the theory on which the analysis is based [1]. <...> Over the last two decades the problem of buckling of shallow lattice domes has grown in importance because of several interrelated developments [3]. <...> The need to cover larger spans without intermediate supports with lightweight structures has made buckling behavior a <...>