About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Ilshat T. Mirsayapov, Doctor of technical sciences, professor, Kazan State University of Architecture and Engineering, Kazan, Russia Federation E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Georgy P. Nikitin, Candidate of technical sciences, associate professor, Kazan State University of Architecture and Engineering, Kazan, Russia Federation E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Midkhat F. Khanbekov, Assistant Chief Engineer of the project, JSC «Kazan Giproniiaviaprom» named after Boris Tihomirov, Kazan, Russia Federation E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it |
| Title of the article | Strengthening of the punching shear zones of the floor slab with non-coaxialityof vertical load-bearing elements along the height of the building |
| Abstract. | Problem statement. The most common reason for strengthening the zones of the floor slab penetration is the absence or insufficiency of transverse reinforcement in these zones. Non-coaxiality of vertical load-bearing elementsis much less often. At the same time, the normative framework regulates the amount of maximum permissible deviations relative to the axis of vertical elements or their non-coaxiality. In the case of excessive deviations, it is recommended to dismantle this structural element. In the practice of construction in Russia, dismantling the entire building (if the non-coaxiality of all vertical elements is detected) with its re-erection is economically impractical. However, due to the lack of standard projects for strengthening the penetration zones, as well as a model for calculating them by numerical methods, it becomes necessary to develop them. The purpose of the work is to develop a model for strengthening the punching zones. The tasks of the work are numerical study of the frame with the construction of two computational models in the software package "LIRA-CAD", analysis of the results of the stress-strain state of a monolithic reinforced concrete frame made with non-coaxiality of columns in height, determination of non-design efforts in the areas of floor slabs punching and platform joint of columns with abnormal execution of longitudinal working reinforcement, checking the bearing capacity of the elements of the uncompleted monolithic reinforced concrete frame in the case of additional bending moments from the action of a vertical load with eccentricity at the junctions of the column with the overlap. Results. The main results of the study are the development of an optimal method of strengthening platform joints to ensure the operable condition of a monolithic reinforced concrete frame and exclusion of the destruction of the floor slab from being forced through when additional bending moments occur from non-coaxiality of columns with the displacement of the longitudinal working reinforcement in them. Conclusions. The significance of the results obtained for the construction industry lies in the fact that the developed method of reinforcement in the presence of deviations of the frame columns exceeding the maximum permissible regulatory values eliminates the collapse of floor slabs from pushing through, as well as the destruction of platform joints. |
| Keywords. | non-coaxiality of columns, displacement of reinforcement, punching, coupling of the overlap with the column (platform joint), strengthening of the frame, strengthening of the punching shear zones. |
| For citations: | Mirsayapov Ilshat T., Nikitin G. P., Khanbekov M. F. Strengthening of the punching shear zones of the floor slab with non-coaxiality of vertical load-bearing elements along the height of the building // News KSUAE, 2022 №4(62), p.30-39 DOI: 10.52409/20731523_2022_4_30 EDN: FCMXSE |
