Национальный исследовательский Московский государственный строительный университет, г. Москва, Россия Аннотация. В данной работе было проведено экспериментальное исследование сварного обетонированного стыка на сдвиговое усилие. Испытание проводилось только на сдвиг, поскольку основное статическое назначение вертикальных стыковых соединений панелей -обеспечить восприятие сдвигающих сил, возникающих в стыках при совместной работе сопрягаемых стен. Объектом исследования является фрагмент вертикального стенового соединения 125 серии крупнопанельных жилых зданий, толщина которого составляла 160мм, а общая высота -550мм. В результате проведенных экспериментальных исследований определено напряженно-деформированное состояние вертикального стыкового соединения и предложена аппроксимирующая зависимость деформации сварного стыка от усилий сдвига. Результаты испытаний могут быть использованы при расчете несущих систем крупнопанельных зданий с учетом нелинейной податливости сварных стыков.Ключевые слова: связи сдвига, податливость связей, стыковые соединения, крупнопанельные здания.Abstract. In this work, an experimental study of the welded concreted joint on the shear force was carried out. The test was carried out only for shear, since the main static purpose of vertical butt joints of panels is to ensure the perception of shear forces arising in the joints when the mating walls work together. The object of the study was a fragment of wall vertical connection 125 a series of largepanel residential buildings, the thickness of which was 160 mm and the total height is 550mm. In result of experimental research defined stress-strain state of vertical butt joints and proposed approximating the dependence of the deformation of the weld joint from shear forces. The test results can be used in the calculation of load-bearing systems of largt-panel buildings taking into account the nonlinear compliance of welded joints.

The constructive basis of a multi-story building is the spatial bearing system of buildings. In accordance with the chosen mathematical apparatus of the study, the spatial load-bearing system of a multi-storey building is a discrete vertical reinforced concrete structure formed by shear walls, and united by constant height connections with certain deformability. The above elements of the building support system provide strength, stability and durability of the structure as a whole. The spatial operation of the system is manifested in the fact that when loading one of its elements, other elements are included in the work. The purpose of the present study is to assess the influence shear bonds of the building’s bearing system on its stress-strain state using a specific building.

Civil buildings, like construction objects, have a certain life cycle; building structures subjected to power influences lose their design bearing capacity and operational suitability over time. The service life of prefabricated buildings was oriented to 50 years. Nevertheless, most of these buildings are still in operation in Russia. The service life of the mass typical series of prefabricated panel buildings is coming to an end, which necessitates a reliable assessment of the stress-strain state of building structures. Analyzes the stress-strain state of the load-bearing systems of mass buildings with linear and nonlinear deformation of shear bond materials. A 9-story large-panel residential building, consisting of one section, was taken as the object of study. Introduction to the algorithm of nonlinear deformation of only one type of shear bond allows us to fix a noticeable difference in the stress-strain state of the vertical load-bearing structures of the building. The discrete-continuous mathematical model creates a methodological basis for researching other basic elements of the spatial bearing system of a multi-storey building and assessing their contribution to the redistribution of efforts.

In this paper, resistance the shear lintels in multi-story buildings is considered, since the main static purpose of vertical butt joints in the form of lintels is to ensure the perception of shear forces arising from the joint operation of the mating walls. The object of the study was a fragment of a monolithic building, the thickness of the walls of which was 300 mm, and the height of the building was 12 floors. As a result of the conducted numerical studies, the stress-strain state of the vertical load-bearing structures of monolithic buildings and the shear deformations along all the lintels along the height of the building were determined. It was found that some of the lintels are in the elastic stage of operation due to a low level of shearing forces. A number of building lintels connecting vertical structures with a significant vertical load drop are in the plastic stage of work. The results of stress redistribution, given in this article, can be used when calculating the bearing systems of monolithic buildings, taking into account the nonlinear compliance of shear bonds.

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