Comparison of design features of recessed and unrecessed dual-purpose structures based on design experience
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Abstract
The study presents a comparison of the design features of recessed and unrecessed dual-purpose structures based on design experience. The purpose of the work is a comprehensive analysis of space-planning and structural solutions for dual-purpose structures, determination of the features of calculations and design, determination of conclusions and recommendations for further design.
The update of regulatory documents and the intensification of scientific research in the field of design and construction of protective structures in general were noted. Most of the research concerns the protection of critical infrastructure facilities, fortifications and special-purpose shelters. The modeling of such structures is based on a clearly defined task - the direct hit impact load, which depends on the type of threat. The number of studies on civilian shelters that must be designed in accordance with current regulatory requirements, where no direct hit design cases are provided, is currently limited.
Regulatory provisions and design experience have established that the space-planning solution of a dual-purpose building is determined, first of all, by the main functional purpose. In residential and public buildings, the most optimal option for the arrangement of dual-purpose structures is underground premises, which are primarily reserved for the storage of vehicles (parking lots).
Three dual-purpose structures were selected for analysis, differing in the features of their structural schemes, burial conditions, and the magnitude of the load from the blast wave. The modeling of each dual-purpose structure was performed in a spatial formulation in SCAD software, taking into account physical and geometric nonlinearities. The consideration of the loading from the blast wave action was realized by the quasi-static method.
It has been established that, in accordance with the regulatory provisions, the nature of the recess of a dual-purpose structure determines the calculated value of the load from the action of a shock blast wave, which in turn affects the stress-strain state of the structures. The change in the load magnitude is quantitatively different for the scheme with full recess, incomplete recess, and complete non-recess.
The obtained results demonstrate that from the point of view of effective design, recessed dual-purpose structures are more appropriate in contrast to partially recessed and completely unrecessed ones.
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