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research of losses of prepressure metalloderevjannyh models in open sheds in Gelendzhike and in Saransk.

Estimation of losses of prepressure and estimation of long work on models of cold open sheds in Saransk (a model 1) and in the centre of the climatic
Trials (FGUP "VIAM", Gelendzhik, Krasnodar territory) (models 2 and 3) spent from July, 10th, till October, 10th, 2016, and then used for an estimation of these parametres for metalloderevjannyh panels of natural domes in similar neighbouring communes.

The establishment of size of prepressure by results of a long-term test preliminary-strained metalloderevjannyh panels becomes complicated that the system at all stage of trial behaves as statically indeterminate and distribution of efforts is influenced by elastic-is viscous-plastic properties of two materials - lumber and a material of string pieces.

For the description of dependence of losses of prepressure for a model 1 from time and an operation climatic conditions the regress equations have been received. On the basis of the received results it is possible to draw a conclusion, that in horizontal string pieces of loss of prepressure are well described by sedate dependence (fig. 4.11). In inclined braces in a model dependence of losses of prepressure for conditions of Saransk can be described also by means of sedate function (fig. 4.12). Determination factors show, that the received equations of regress describe a variation of values of losses of prepressure with determination for string pieces of a model to 99 %; for inclined braces - to 98 %.

The model 2 at assemblage, thanks to successful geometry and exact adjustment of wooden component parts, has allowed to set the greatest prestressing and has been selected for conditions Gelendzhika together with the third model. However the central knot had small twisting at assemblage within accuracy of manufacturing of wooden products ±1 mm. Twisting did not grow and was not shown within almost one and a half years of trials.

However at a finishing stage, it is possible as a result of mechanical impact at moving of a model 2 at the stand, twisting began to accrue sharply and it was reflected in test results. I.e. it is possible to tell, that
The model viscously collapsed last year and twisting has reached values ±3мм. It was reflected in prepressure losses.

Fig. 4.11. The equations of regress of losses of prestress in steel string pieces of a model 1 in the conditions of not heated premise g Saransk.

For the description of dependence of losses of prepressure of a model 2 from time and a climatic conditions of operation Gelendzhika the regress equations have been received also.

Fig. 4.12. The equations of regress of losses of prestress in steel inclined braces of a model 1 in the conditions of not heated premise g Saransk.

On the basis of the received results it is possible to draw a conclusion, that in horizontal string pieces intensive losses of prepressure are described in the best way by quadratic dependence (fig. 4.13).

Fig. 4.13. The equations of regress of losses of prestress in steel string pieces of a model 2 in the conditions of an open open shed of Gelendzhika.

Dependence of accruing losses of prepressure in inclined braces in a model 2 can be described with correlation to 0,99 by means of one of functions, quadratic or cubic (fig. 4.14). Determination factors show, that the received equations of regress describe dependence of values of losses of prepressure with probability for inclined braces of a model 2 - 97 % and 98 %;. For string pieces of 96 %.

For the description of dependence of losses of prepressure of a model 3 from time and a climatic conditions of operation Gelendzhika the regress equations have been received also. On the basis of the received data it is possible to draw a conclusion, that in horizontal string pieces of loss of prepressure are described by quadratic dependence (fig. 4.15).

Fig. 4.14. The equations of regress of losses of prestress in steel inclined braces of a model 2 in the conditions of an open open shed of Gelendzhika.

Dependence of losses of prepressure in inclined braces of a model 3 for conditions Gelendzhika is reflected also well by means of quadratic function (fig. 4.16). Determination factors show, that the received equations of regress describe a variation of values of losses of prepressure with probability for inclined braces of a model 3 - 96 %; for string pieces - 99 %.

Fig. 4.15. The equations of regress of losses of prestress in steel string pieces of a model 3 in the conditions of an open open shed of Gelendzhika.

During trials of 27 months of loss of prepressure of a model 1 in Saransk, considerable at the first stage, then are slowly stabilised (schedules fig. 4.11, 4.12); on models 2 and 3 in Gelendzhike prepressure losses continued to accrue intensively (schedules fig. 4.13 and 4.14, 4.15 and 4.16). The increased increase of losses of prepressure of models in the course of climatic trials in Gelendzhike is possibly caused by changeable conditions of carrying out of experiment (repeated movings of models from a floor on a flooring and back), shown especially at the small period of trials.

Fig. 4.16. The equations of regress of losses of prestress in steel inclined braces of a model 3 in the conditions of an open open shed of Gelendzhika.

Losses of prestress at level of settlement pressure 0,6 JAmaks. In rods of string pieces of a model 1 makes 24 months prior to 49 % from the maximum. Losses of prestress at level 0,4 R from settlement pressure in rods of inclined braces reach 24 months prior to 48 %.

Experimental data of losses of prepressure of models 1 in

Saransk and models 2 and 3 in Gelendzhike with the account tarirovochnoj a curved line of drawing 4.7 are resulted in the appendix 3, in table 3.3 and 3.4.

Fig. 4.17. Trials of models for platforms of open sheds: and - models in Gelendzhike; - a model in Saransk.

Conclusions of the author according to prepressure losses in metalloderevjannyh designs of not heated buildings (a shut open shed), resulted in work [15] prove to be true. Analyzing work of models in the conditions of a corrosive sea climate (an open open shed), it is necessary to refuse prepressure in not protected wood structures in excited environments and conditions of the raised moisture content.

Numerical experiment on research of prepressure of the geodetic steel and wooden domes, spent taking into account nonlinear dependences of losses of prestress, has allowed to define degree of influence of various factors on size of loss of prepressure.

Fig. 4.18. Trials of models 2 and 3 on an open shed platform in Gelendzhike.

The greatest influence renders rigidness of mating of elements and elements of a dome and further on influence degree - initial imperfections for steel and wooden elements, physical nonlinearity of work of lumber, obmjatie lumbers in knots, character of the appendix of loading, moisture content of lumber, change of temperature of environment.

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A source: Antoshkin Vasily Dmitrievich. is constructive-TECHNOLOGICAL DECISIONS of PRECAST SPHERICAL SHELLS. The dissertation on competition of a scientific degree of a Dr.Sci.Tech. Saransk - 2017. 2017

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