No 2 (2013)

Mathematical models and calculation's algorithms of the stress-strain state of a cylindri- cal shell in a zone of its distortion are developed. In places of fixing, presence of connections and joints, actions of local loadings arise additional in relation to the classical theory quickly damped stresses. The boundary value problem is solved and calculations of stresses near rig- idly mounted shell edge at axisymmetrical loading are carried out.

The approach for decision of the Nave-Stokes equation of fluid mechanics based on the BEM elasticity is shown. The offered BEM may be applied for design of the wind loading on civil constructions.

In the paper, the method of finding the critical load in case when the metallic rectangular bar is loaded intensively increasing in time force is overviewed. In the formation of equations of movement taken in account, the relation of the flexural yield stress ?y from strain rate is presented.

The paper considers the dynamic behavior of buried pipeline with constructive inclu- sion. It is shown that a traveling wave is transformed into transmitted and reflected waves. The effect of the analytical dependence is assessed. It is shown that the construc- tive inclusion reduces the level of dynamic impact.

In some countries and especially in Benin, some premature fissuring of semi-rigid struc- tures in gravelly lateritic built, for the most, with important investment costs is often estab- lished. This is mostly due to the bad proportion in binding agent and sometimes to an overex- ploitation of the piece of work. The present study enters within the general context of the re- search of alternative solutions for an efficient exploitation of local materials (gravelly) in road technique in Benin. This work has consisted to do two borrowing in each one of two zones on which a complete identification has been realized. The materials had afterwards ameliorated at 2%, 3% and 4% of cement in sight of the determination of optimal dose in cement which guarantees satisfactory mechanic characteristics. Accorded to this approach, it was deter- mined that the using of these materials at the natural condition is possible only in sub base course. The formulation study of heterogeneous gravelly-cement in base course has revealed optimal dose relative to every borrowing. Therefore, for security reasons depended on loss of yard, all these values have been brought back at 3.5% at the implementing of gravelly-cement within study zones. The application of this study will guarantee then relative economy no less important.