No 2 (2011)

The problem of a plastic deforming of a circular plate with rigid pinching edge under act of axisymmetric loading in view of greater bending flexures is observed. The model of ideally plastic body, surface of flow for shells with continuous single-layer cross-section, the kinematic conditions of jointness is used. The analytical solution in a parametric aspect is gained.

The article is about the improving the method of calculating crack resistance of ferroconcrete sections in the bending on the base of deformation model. It is offered a formula of the moment of appearing cracks, which can be considered exact for its adequacy to the experiment. With due regard for influence of reinforcing at the moment of appearing cracks will improve technical-economical effectiveness and durability of ferro-concrete constructions, calculating limited conditions of which are depended on limitation for appearing and enlarging

Kinematic design of earthquake resistant building support with the complex edge contact surface and providing seismic isolation of structures of buildings has been developed.

Described are procedures and results of investigating the stress- strained state (SSS) of the filled in with soil bridge construction with a cylindrical arch of a constant thickness made from the monolithic reinforced concrete with the use of flat and three-dimensional finite-element models. The data of the full-scale measurements of displacements and deformations of the bridge span are compared with the results of calculation on the basis of the models accepted.

The purpose of the present study is to determine the dynamic pressures of the wind and to establish a wind-region map for Benin. In order to do that, we have, after the collection of meteorological information (data of speed), carried out: - the analysis of average and instantaneous data (speed) of wind of the six main meteorological stations in accordance with the statistical methods recommended by the National Code of Building in Canada (NCB) and the Snow and Wind 65 Rules. These data cover a period of 23 years; - the analysis of the speed variations speed by means of numerical techniques; - the analysis, according to AFNOR norms, of the influence of the relief and vegetation on the sharing out of the coefficients of site and dynamic pressures. At the end of this study, we established: - Dynamic pressures and basic speeds to be taken into account during the assessment of wind overloads; - That the basic speeds in the stations of Cotonou, Savè, Bohicon and Parakou are likely to be obsolete with time; - The geographical distribution of the site coefficients and dynamic pressures in Benin; Appropriate region maps.