Study on stability of double corsair's main stand
The structure safety is numerically studied on main support of the huge pirate ship by use of finite element method (FEM). In order to the elements meshed successfully, the equivalent treatment is used for the complex structure. The static, structure instability and model analyses are carried out. The static and stability safe coefficient are 6.12 and 19, respectively, which are more than the demand in national standard. The model analysis indicates that the swing frequency is 0.08 Hz, and can be kept off the natural frequency.
Experimental analysis of prestressed thin-walled structures stability
In this paper the results of experimental investigations and numerical calculations of thin-walled plate girders are presented. The objective of this investigation was to determine the effect of prestressing technology based on weld shrinkage of fillet welds joining additional overlay plates welded in the area of the structure tension on their stability.
MODELING OF INITIAL GEOMETRICAL IMPERFECTIONS IN STABILITY ANALYSIS OF THIN-WALLED STRUCTURES
Imperfections are modeled using actual values measured in situ. The method proposed in the paper is based on the concept of developing the imperfections in series of eigenmodes, using a limited number of most critical eigenmodes. Error minimization of this representation is performed. The method is applied to the nonlinear stability analysis of structures made of steel thin-walled cold-formed sigma profiles. FEM with shell elements and the Riks method are used. Numerical examples illustrate the influence of initial imperfections on post buckling behavior of structures.