Щодо можливості використання спрощених методик розрахунків для визначення несучої здатності перерізів залізобетонних елементів

Abstract

UK: Шляхом зіставлення граничних моментів у перерізі залізобетонного елемента в зоні чистого згину, отриманих шляхом використання методик розрахунку, викладених у деяких нормативних документах, виявлено відмінності між застосуванням національного нормативного документа ДБН В.2.6–98:2009 з можливістю використання спрощених методик на стадії попереднього проектування.

EN: While implementation of calculations, designers use the certain rules of application, that are the generally accepted methods. There must be possibly the use of the simplified design techniques in this case, if it is possible to prove that they are confronted to corresponding principles and provide the degree of safety and durability not less, than methodologies offered by operating normative documents. Eurocode on the basis of which DBN V.2.6–98:2009 was made, allows to use considerable part of methodologies from the normative documents operating on the territory of former post–soviet territory, as their basic principles correspond largely. During the use of any alternative methodology it is already impossible to consider, that planning is executed in complete accordance with DBN V.2.6–98:2009, however regulative organizations, during realization of calculations, usually use the simplified methodology of the former, tested, normative documents.

By comparison of maximum moments in the cut of reinforce–concrete element in the zone of clear bend, which were received with the help of using of methodologies of calculation which were used in some normative documents, it is necessary to educe differences between application of national normative document of DBN V.2.6–98:2009 with possibility of the use of the simplified methodologies on the stage of the previous planning.

Marked in DBN V.2.6–98:2009 the calculation of the normal crossing of reinforce–concrete elements according to the deformation method is not difficult, but needs a lot of time for the decision of simple tasks. Comparatively with the operating norms of Russia, Belarus and European Union, the result of determination of bearing strength of the normal crossing does not exceed 5 % toward the reduction of maximum values, while the same difference between the cancelled norms of SNiP 2.03.01–84* is 2 %. Coming from the obtained data, for implementation of approximate calculations on the stage of the previous planning, it is enough to take advantage of easy and tested methodology, with further clarification of results at the detailed calculations.