Abstract
This paper presents the results of using frame structures in industrial construction with pile foundations under dynamic influences. In the course of the study, a set of formulas were derived to determine the amplitude-frequency characteristics of the system "flat frame-grillage-group of piles" at different levels of action of loads excited from the seismic platform, and natural frequencies were calculated, bending moments, shear forces at the points of fixation of the system elements were determined. The results of calculations and analysis make it possible to obtain the dynamic characteristics of a flat frame on pile foundations, which are necessary for subsequent calculations.
Highlights
Design and construction of buildings and structures on collapsible soils to ensure their strength and normal operation are among the most important and complex problems of modern construction
The problem of dynamic calculation of the system "flat frame-grillage-pile group" can be formulated as follows: calculate natural frequencies, determine bending moments, shear forces at the fixing points of the system elements, obtain the amplitude-frequency characteristics of the system at different levels of action of loads excited from the seismic platform and at separate work of grillages uniting the heads of piles, including in the position of their fastening to a single slab
Based on the obtained formulas, graphs were built to determine the magnitude of displacements of coatings, combined grillages, and graphs of changes in the magnitude of the shearing force and bending moment at the ends of the elements of the system
Summary
Design and construction of buildings and structures on collapsible soils to ensure their strength and normal operation are among the most important and complex problems of modern construction. One of the main tasks of calculating structures for dynamic loads is the determination of displacements, shear forces, bending moments, etc It follows from this that a complete analysis of buildings and structures during forced vibrations, depending on the geometric physical parameters, the system creates sufficient conditions for their further operation under unfavorable conditions. The research object is a one-story industrial building consisting of a flat frame on pile foundations (Figure 1) In this case, we consider two different sides of the problem to be solved: a) Grillage operate independently from each other; b) The grillage connecting the pile heads works in the form of a solid slab. The problem of dynamic calculation of the system "flat frame-grillage-pile group" can be formulated as follows: calculate natural frequencies, determine bending moments, shear forces at the fixing points of the system elements, obtain the amplitude-frequency characteristics of the system at different levels of action of loads excited from the seismic platform and at separate work of grillages uniting the heads of piles, including in the position of their fastening (grillages) to a single slab
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