No 4 (2013)

The paper considers some issues of combinatorial-variational geometric modeling for computer-aided formation of engineering constructions and buildings in their design using modern computer-aided approach.

The infinite plate, reinforced with a regular system of ribs and weakened by one rectilinear crack is considered. The crack surfaces interact in the end zones. The stress intensity factors are found. For determining limit equilibrium crack the two-parameter fracture criterion is used.

State of the art in geometrically nonlinear analysis of space frames is presented in the paper. The main difficulties that arise in formulation of incremental equations and the main drawbacks of existing methods are described.

Moscow Owing to the various reasons, the real physic-and-mechanical characteristics of soil of the bases of hydraulic engineering structural systems can differ from design preconditions. The technique of settlement specification of the actual physic-and-mechanical characteristics of the rocky and not rocky bases of hydraulic engineering structural systems is offered. This is done on the basis of finite element models of the system "erection - basis" with taking into account natural supervisions over settling of erections. Examples of the application of the developed technique, concerning the bases of sections of the concrete dam of Boguchany hydroelectric power station and the water intake of the Zagorsk GAES-2 are given.

In the paper, the methodology of optimal choice of deformation and force parameters of calibration sets out when forge-rolling.

The present work has for objective the survey of the features of the rainfall observed on the Ouémé's basin and the establishment of the the evaluation of the daily exceptional rains very used in the conception of the hydraulic works and Civil Engineering. The extreme annual daily rainfalls of 37 rainfall stations of Benin installed on the Ouémé's basin have been analyzed on the period 1971-2010. Then, they have been adjusted to an extreme value law selected among the laws of Jenkinson and Gumbel according to the Kolmogorov-Smirnov test. These tests permitted to regionalize the laws of adjustment in distinct two zones of application: the law of Jenkinson appears more adequate to the zone South while the law of Gumbel suits the North zone of Benin better; what makes notice the non consistency of the exclusive use of the law of Gumbel at the time of the studies of conception of hydraulic works on the whole territory. The evaluation of the quantiles relative of daily rain to the period’s back 2, 5, 10, 20, 50 and 100 years revealed that the maximal heights of water of rare frequency are observed at the Cotonou-Airport station on the Coastline and the maximal heights of water weakest in Ina's region to the North of Benin.

The results of the experimental research on the strength of masonry walls made of large-size ceramic perforated hollow core blocks with 52% porosity produced by “Ryabovskiy Ceramic Ware Factory” LLC have been analyzed. Masonry walls were built with adhesive mixture. The experiment included different types of static load testing (compression, bending, shear). High strength of masonry walls made of LCPHB with 2-3mm wide joints was noticed.