Research on the influence of the simulation method of the soil base of a slab foundation on the stress-strain state of building structures

The paper is devoted to the study of the influence of the simulation method of the soil base of a monolithic reinforced concrete slab foundation on the stress-strain state of underground and above-ground structures. A comparison is made of: 1) bending moments in the foundation slab; 2) foundation subsidence; 3) stress in monolithic reinforced concrete basement walls; 4) bending moments in the floor slab above the basement; 5) stress in wall panels of a typical (4th) floor; 6) horizontal displacements of parapet wall panels; 7) time spent on calculating the model. It has been established that the use of a simplified approach to numerical simulation, namely the use of a model with soil base rigidity coefficients makes it possible to obtain information on the stress-strain state of foundations and above-ground structures several times faster (approximately three times) than when using volumetric finite elements for the soil simulation. It has been studied that the use of a model with stiffness coefficients leads to overestimated displacement values, namely: foundation subsidence by 3.4 times, and horizontal displacements of above-ground structures by 2 times compared to the use of models with a volumetric soil massif. It has been revealed that the bending moments in the foundation slab when using a simplified approach to numerical modeling will differ within 10% from the approach using volumetric FE as a basis. It has been studied that horizontal stresses in monolithic reinforced concrete basement walls differ both quantitatively and significantly depending on the base modeling method. Vertical stresses in the basement walls when using foundation stiffness coefficients will be 10% greater than in models using the imperial approach. It has been found that the bending moments in the floor slab above the basement are almost independent of the base modeling method. It was found that horizontal stresses in wall panels of a typical (fourth) floor will be 25% lower when using a model with foundation stiffness coefficients. Vertical stresses correlate well with each other, regardless of the soil basesimulating method, the difference is about 2%.