Strilets V. Method of accounting the temperature deformations of building structures during geodetic works

The thesis developed а methodology and technology to accounting the influence of temperature deformations of building structures during the stacking-out and geodetic monitoring. The effectiveness of the methods of construction mechanics for accurate determination of temperature displacements for complex engineering structures was investigated. The thesis presents the results of the study of mathematical models of temperature deformations on an example of beams and frames, for which the inadmissibility of using a geometric approach in calculating corrections in the results of geodetic measurements or the initial geodesic data for the influence of temperature is presented. Simplified calculation models for calculation of temperature congestion of building structures, which allow to estimate the magnitude of influence of temperature deformations on the accuracy of engineering and geodetic works, are offered. The methodical recommendations for accounting the error due to the influence of the temperature deformations of building structures during the calculation of the accuracy of geodetic placement works are developed in the thesis. It makes possible on the basis of calculation of temperature influence to determine the accuracy of the execution of geodetic works for the entire structure and the accuracy of stacking-out. To determine the allowable value of the deviation caused by the temperature deformation to the expression of the root mean square error the criterion of neglecting the small errors was applied. In the dissertation, on the basis of the preliminary accuracy calculation of the geodetic works a method for calculating the accuracy of detailed stacking-out was demonstrated. It was found that during the development of normative documents the values of temperature deformations were introduced as errors of assembling works. The above calculations showed that with the cancelling of the temperature component the requirement to accuracy of geodetic works can be reduced by half. The technological scheme of stacking-out works taking into account the influence of temperature deformations is proposed. The values of the calculated temperature displacements should be set into initial data or in the stacking-out elements. General approach to the calculation of the influence of temperature deformations of protective structures for determination the actual deformation during geodetic monitoring was proposed. The approach will allow to simulate the accuracy of geodetic works and analyze the state of the investigated structure. Calculated values of temperature displacements were excluded from the results of geodetic monitoring and the actual values of deformations of the retaining wall were established. The calculation of the accuracy of the temperature measurement using the dimensional chains theory and the conditions under which its influence on the accuracy of geodetic works can be neglected were established. It is noted that due to application of methods of structural mechanics it is possible to solve a problem of the research, namely to determine the magnitudes of probable temperature deformations of building structures and take them into account during performing geodetic works.