Design of multi-story industrial buildings taking into account resistance to progressive collapse in the SCAD++ PC

Abstract

Progressive collapse is a process in which local damage to a structure leads to a chain reaction of destruction that spreads to the entire building or a significant part of it. This phenomenon can have catastrophic consequences, so understanding its causes is extremely important for ensuring the safety of buildings and structures.

The most common causes of progressive destruction are external influences caused by natural or man-made factors. Traditionally, the highest percentage of such destruction is occupied by brittle destruction (for example, during fires) and loss of stability (due to seismic effects, explosions, impacts, etc.), less often by fatigue and ductile destruction.

To prevent progressive destruction when making design decisions, it is necessary first to reduce the level of risk by directly calculating such risk. It is important to use such calculation and design solutions that will make possible damage impossible (general strengthening of the entire building, local strengthening, interconnection). Structural interconnection of elements (or structural continuity) is also noted among the methods of general or local strengthening.

Progressive collapse usually begins with the loss of stability and strength of one or more vertical structural elements of a building or structure (columns or pylons). For the building to withstand, it is necessary to provide an alternative path for transferring the load to other structural elements. Adjacent elements must be designed to resist these redistributed loads (those that the collapsed structure would have to bear). Otherwise, collapse will inevitably occur, and further load redistribution will occur until equilibrium is reached. This in turn will lead to partial or complete collapse of the building or structure.

Protection against progressive collapse involves computer modeling using finite element and limit equilibrium methods. It allows you to create full-fledged models that almost completely correspond to the response of the building to local destruction.

The work performed a calculation of a multi-story building of the production building of a compound feed plant with a steel frame for progressive collapse. The calculation was performed using licensed software - SCAD Office - an integrated system for strength analysis and design of structures of the MSE.