Моделювання стійкості та надійності системи грунт-фундамент-будівля при дії силових та високотемпературних впливів

Abstract

Given the great potential of using the underground space under construction, the question arises of ensuring the stability and reliability of the soil-foundation-building system for the timely detection of signs of destruction, soil subsidence or material fatigue of structures. The analysis of literary sources and the set research tasks were carried out. An urgent scientific and technical task is the development of a numerical model and methodology for the complex calculation of avalanche-like collapse of buildings and structures in the event of fire and explosions, taking into account the peculiarities of the operation of soils and their properties. In the course of research, a numerical model was developed with the help of LIRA-SAPR software and a numerical simulation of a four-story car park (parking lot) was carried out, taking into account the peculiarities of the operation of soils and their properties, which will later be used to simulate an avalanche-like collapse in the event of a fire (explosion). . For this, the first stage was the construction of a model of a four-story car park (parking lot): creating an initial project (determining the dimensions and characteristics of the building, choosing the necessary parameters for modeling - height, width, length, location of entrances and exits, placement of cars); creating a 3D model in the SAPPHIRE 3D program (using tools to build a building: walls, ceiling, floors, stairs, elevators, etc., adding parking elements); setting model parameters (specifying materials for building elements, setting parameters for calculating loads); model analysis and problem solving (checking the model for errors, correcting parameters to achieve optimal results); performing calculations and analyzing the results; preparation of the report and conclusions. In the second stage, the model was checked in the PC "LIRA-SAPR", the soil array was built in the soil module. Works include: import of the model to "LIRA-SAPR"; analysis of the model for compliance (checking the geometry and dimensions of the building in LIRA-CAD, checking the presence of the necessary structural elements and their parameters); creation of a soil massif (starting the soil module as part of LIRA-SAPR, selecting parameters for building a soil massif - soil type, depth, load parameters, etc.); construction of the soil massif (using the tools of the soil module to construct the soil massif under the building, specifying parameters of depth, levels, soil properties, etc.); analysis of the impact of the soil mass on the structure (calculations to determine the impact of soil pressure on the building structure, analysis of the results of the engineering and geological characteristics of the soil mass on the need for correction of the building structure); model correction and re-analysis (making changes to the building model or soil mass parameters, re-analysis of the influence of the soil mass on the structure to determine the appropriate changes and corrections).