No 5 (2015)

Virtual 3D modeling of the Shukhov's tower located in Shabolovka Street was performed in the S.I. Vavilov Institute for the History of Science and Technology of the Russian Acad- emy of Sciences in 2011-2013 and enabled to reveal a number of differences between histori- cal documentation and the real structure. Some of the results were published earlier. New re- sults regarding the height of the tower and the method of mounting of the intermediate rigidity rings to the outer legs of the two lower sections are presented in this article

The paper presents a theory for calculating eccentrically compressed concrete elements in the ultimate limit state of bearing capacity, taking into account all the possible stresses in the longitudinal reinforcement from RS to RSC, caused by different values of the eccentricity e of the longitudinal force N. Method of calculation is based on the simultaneous solution of the equilibrium equations of longitudinal forces and internal forces with equilibrium equations of bending moments. The joint solution of the above as well as additional equations that reflect the stress-strain limit state elements makes it possible to obtain a higher convergence of the calculated bearing capacity with an experienced, as well as to enhance the durability and reli- ability in their operatio

The problem of dynamic equilibrium of the pavement under the action of moving load using ratios plane strain viscoelastic solid, resting on viscoelastic foundation is considered. By using finite difference method developed economical constitutive relation for numerical im- plementation of the problem. Approach to analysis in the frequency range is offered. Depend- ences of the road surface displacement amplitude on moving load speed for different values of foundation modulus are shown. Optimal speed of moving load is determined.

The algorithm of calculation of thin shells is presented on a basis of the triangular final element, in a column of nodal varied parameters of which is included additionally the correct- ing Lagrangian coefficients, and that allowed to improve compatibility of taken type of an element of discretization

The design of bars, lying on an elastic base is fulfilled usually with help of a simple model of the base proposed by Winkler. This hypothesis was subjected to repeated critics. A new model of nonlocal elastic foundation was proposed by PotapovV.D . It allows reducing some contradictions of Winkler's model. In the paper, an attempt of an experimental test of the hypothesis of nonlocal elastic foundation is undertaken

The article tells about the experimental researches for determination the carrying capacity and identificationthe most successful arch construction, consisted from small timber bricks, strung together on two steel cables. While pulling cables from the mainstay area, the bricks garland transformed to double joint brick-cable arch. Three different constructive schemes of this arch were tested and each of themwas loadedby the concentrated force at its top region. Graphics force-deformationwereplotted as the results of the tests. It was determined such construction of the brick-cable arch, as was comparable to the glued laminated timber arch by its carrying capacity.