抄録
A method and a numerical analysis to the large deformation collapse behavior of truss structures are presented in this paper, with consideration of yielding, buckling and the rupturing of members. Truss members are idealized that the both ends of each member are connected to the related nodes by pin condition and only axial force acts to the each member. Axial force and stiffness of each member are assumed to be expressed as a functions of axial force-deformation hysteresis and current axial deformation. For the purpose of avoiding the difficulties of convergence due to the occurrence of large unbalanced force caused by the rupture of members, a method of repeating load-unload process is used to reduce axial force step-by-step, and to express the rupturing phenomena of members. A shallow truss dome, a plane truss and a double-layer grid space truss are analyzed as examples. In the first example, the result of our analysis is in accord with the other numerical solution. The results of other examples show that gradual strength reduction due to the buckling or yielding of members and abrupt strength dropping due to the rupture of members can be expressed well by using the proposed method.
