Аннотация. В статье рассматриваются результаты испытаний деревянных составных балок, соединенных металлическими зубчатыми пластинами (МЗП), разрушающей нагрузкой. Установлены два типа разрушения составных деревянных балок: хрупкое и пластичное. Построена математическая модель составных деревянных балок с МЗП и проведен анализ результатов численных исследований. В математической модели составных балок учтена податливость соединения «МЗП-древесина» введением в расчетную схему элементов, имитирующих соединение, в виде стержней с приведенным модулем упругости. Выполнено сравнение полученных теоретических и экспериментальных результатов напряженно-деформируемого состояния (НДС) в составной балке с МЗП. Сделан вывод об эффективности применения МЗП для повышения сдвигоустойчивости соединения составных деревянных конструкций как при усилении, так и при изготовлении новых балочных конструкций.
Wooden-composite plate-ribbed bent panels with structural plywood and oriented strand board sheathing with breaks are considered. An overview of studies researching and improving the effectiveness of different types of panels is presented. On the basis of the theory of calculation of composite rods by A.R. Rzha- nitsyn, a mathematical model has been compiled, which makes it possible to calculate the stress-strain state of these structures, taking into account the pre- sence of breaks in the sheathing and the flexibility of the mechanical fasteners of the sheathing and ribs. An equation for finding the coordinates of the most dangerous section of wooden ribs in the presence of breaks in the sheathing, which may not match with the middle of the span, is obtained. Panels with sheathing in a compressed zone with different locations of joints, symmetrically relative to the middle of the panel span are considered. Panels without joints in the skin are considered to compare the results. The graphs of the dependence of the maximum tensile stresses in the ribs in the most dangerous section and the maximum vertical displacements from the stiffness coefficient of the shear ties and the location of the breaks in the sheathing are presented. The values of the coefficients for the engineering design of panels, taking into account the decrease in the strength and deformation characteristics of the composite section of panels with breaks in the sheathing, as compared to panels with a solid sheathing, are obtained. The conclusions and recommendations, based on the results of the investigations, which can be used in the design of wooden-composite plate-ribbed structures, are formulated.
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