No 1 (2010)

Different approaches in forming the governing equations for the creeping problems of shallow ribbed shells based on various presentations of total energy functional and the ways of estimating results of influence function are analyzed. The examples of getting solutions for the shells made of acrylic plastic are given.

The optimal designing method of building structures existing in temperature field is presented. The design of thick-walled cylinder is considered as an example.

It to job the unidirectional layer represents kvazi the homogeneous the anisotropic environment which elastic properties are defined by elastic properties of components, i.e. properties of fibers and matrixes, their quantitative parity, and also structure of an arrangement of fibers and their orientation. Because physic mechanical properties of layers can differ from each other is defined the resulted mechanical characteristics of cross-section section. For the decision of a problem of the generalized torsion the decision of a problem on pure torsion for each layer i is found. After substitution preliminary certain functions for each layer i in the right parts of the equation from the decision of the non-uniform differential equation there is a value for each layer i. As functions are preliminary defined, from the decision of the non-uniform differential equation there is a value for each layer i. Thus, on the found functions the system of the equations together with boundary conditions allows mathematical to formulate a problem for definition separately of function and separately of function for each layer i. For the decision of system of the equations the method consecutive approach is used. Calculation comes to an end at sufficient affinity of results next approach. Therefore the form of the decision favorably differs from the decision offered by other authors that allows receiving directly decisions in moving.

Algorithms for direct computing of singular states of space trusses at singular states and subsequent continuation of load paths are described in the paper. An example of geometrically nonlinear stability analysis of lattice shell is presented.

Analysis of effective facility for reduction of harmful water hammer wave processes in circular cylindrical shells based on elastic-damping action is described.

Recommendations for modern reduction of standards and rules for building in seismic regions are given due to the natural dynamic tests of buildings and to investigation of consequences of hard earthquakes.