Search

A large number of bridges in Ukraine have been built in the 60–70 s (about 54 % of the total number). In that regard, the number of cases of detecting various types of damage on the elements of bridge structures is increasing, which can cause emergencies in the future. It also suggests that most of the bridges and overpasses were built according to the old technical standards and now do not meet the modern standards of DBN V.2.3-14: 2006 and DBN V.2.3-22: 2009, both in terms of carrying capacity and dimensions of the roadway. Therefore, the issues of strengthening the existing spans are relevant. Goal. The work analyzes the effect of reinforcement of diaphragm spans on their spatial work in order to determine the effectiveness of reinforcement by gluing additional rigid reinforcement and installing transverse metal beams. The tasks that have been solved in the work are as follows: creating an adequate finite element model of the diaphragm span; limiting the number of options for design schemes to the optimal number; construction and analysis of the graphs of bending moments and deflections in the cross-section in the middle of the span of beams. Results. The graphs of the distribution of bending moments in the beams of the superstructure for different dimensions show that the presence of reinforcement does not affect the value of the bending moment, and the distribution of forces between the beams of the superstructure becomes less uniform with an increase in their number. The deflections for all load cases and dimensions are greater than the deflections of beams with reinforcement; however, the installation of an additional transverse metal beam does not affect the values and distribution of deflections. Beam deflection graphs become less uniform with an increase in their number. Practical value. Analysis of the effect of reinforcement on the spatial work of span structures has shown that only reinforcement of beams with longitudinal rigid reinforcement without installing transverse beams is expedient in practice., Для аналізу просторової роботи прогонових будов, зведених відповідно до ТП 56, створено скінченно-елементні моделі з огляду на сумісну роботу, використовуючи сталеві наклади. Розглянуто всі варіанти прольотів та габаритів типового проекту та два варіанти підсилення. Наведено аналіз впливу підсилення балок на їхню просторову роботу.