Examining the results of the experimental solution with a focus to elastic effect area

Problematic of soil - structure - interaction is subject of research for many years, however satisfactory accuracy of numerical models has not been achieved yet. Therefore, it is necessary to examine this phenomenon. For this purpose, special testing equipment was built at Faculty of Civil Engineering in Ostrava and series of experimental tests were performed. One of the tested slabs was chosen and its numerical model was created in computational program Ansys 18.0. Numerical model consists of two parts - slab and soil, connected with a contact element. From the test and the model data, maximal deformations and deformations trough the cross section of the slab were compared. This paper examines whether the Hooke’s law is valid and can be used to express the test behavior and locate elastic effect area allowing linear modelling which can be useful for lowering computational time

Parametric study for influence of input parameters for analysis of fibre reinforced concrete slab-soil interaction

For geotechnical engineering and design of foundation elements of structures is important to properly determine the stress-deformation state of the subsoil. The calculation is most often done using the finite element method and the computational models. This article includes the parametric study for the selected type of concrete foundation structures. The article focuses attention to the calculation of the deformation of the slab with respect to the influences of individual input parameters (e.g. stiffness of concrete and subsoil, boundary condition, size of elements). Calculations are performed for two concrete types and three soil variants

Numerical analysis of subsoil-reinforced concrete slab interaction

This article presents the numerical modeling of interaction between a reinforced concrete slab and subsoil using ABAQUS. Subsoil was simulated as both homogeneous half-space and inhomogeneous half-space. Reinforcement bars in the concrete slab were accurately modelled allowing capturing a precise deformation profile of the slab in interaction with subsoil. Input data for numerical analysis were adopted from a published work. Results of the study were verified on the basis of comparison with those of the previous study

Analytical derivation of friction parameters for FEM calculation of the state of stress in foundation structures on undermined territories

When calculating the state of stress in a structure caused by relative strain of landscape which is a result of undermining, the structure is often deformed in order to create the specific situation. Each part of the structure resists the strain in a difference way. This depends on places where the structure is in contact with soil environment. When calculating the 3D foundation structures by means of the Finite Element Method (FEM), it is necessary to determine the soil environment resistance. For that purpose, most FEM software applications enable now to enter the friction parameters C1x and C1y. Unlike C1z which resists the structure in the direction perpendicular to the element’s plane, these parameters are applied in the central line plane of a slab and rod element.Web of Science18426125

Comparing the rigidity of the prestressed and non-prestressed foundation

If compared with reinforced concrete, the prestressed concrete is able to resist higher loads before cracks develop. As cracks reduce considerably rigidity of the element, the prestressed element can be regarded as rather rigid. The article compares the rigidity of the prestressed and non-prestressed foundations in two axes. Prestressed and non-prestressed variant is made for foundation structure of the rolling device in the Block Mill. A parametric study was created for investigation of impacts of the prestress on the foundation height. The savings of the concrete due to prestressing was also observed.Web of Science785-211611

Technology of coupled timber-concrete ceiling using bonded shear connectors

V článku je popsán konkrétní technologický postup, který byl ověřen při rekonstrukci stropní konstrukce domu na Sokolské ulici v Ostravě. Po předchozích experimentálních zkouškách v laboratořích na Fakultě stavební VSB – TU Ostrava tak byla poprvé aplikována a ve stavební praxi úspěšně ověřena technologie lepených smykových lišt při statickém zesilování dřevěných stropů. Tento příspěvek se zabývám možnostmi využití spřažených dřevo-betonových konstrukcí s využitím vlepené spřahovací lišty. Uvedený postup statického zesílení je vhodný především u rekonstrukcí historických dřevěných stropů a všude tam, kde je nutno zamezit poškození nenosných konstrukcí (např. podhled, omítku, štukovou výzdobu apod.). Metoda se uplatní rovněž v takových případech, kdy je nutno zachovat provoz v místnostech pod rekonstruovaným stropem.The article describes the specific technological process that has been examined in the reconstruction of the ceiling structure of a house on Sokolska Street in Ostrava. Following experimental testing in laboratories at the Faculty of Civil Engineering VSB - TU Ostrava the technology of bonded shear bars under static reinforcement of timber ceilings was first applied and successfully tested in construction practice. This paper deals with the possibilities of using coupled timber-concrete structures by means a glued coupling bar. The described process of static reinforcement is particularly suitable for reconstruction of historic timber ceilings and places where it is necessary to prevent damage to non-supporting structures (e.g. ceiling, plaster, stucco decorations, etc.). The method is also employed in those cases where it is necessary to allow traffic-flow in the rooms below the reconstructed ceiling

Monitoring of excessive deformation of steel structure Extra-High Voltage pylons

Reliability and security of a power transmission depends on the state of the power grid and mainly on the state of the Extra-High Voltage pylons. The paper deals with deformation analysis of existing steel structure of selected Extra-High Voltage pylons which showed excessive differences comparing to the original design. In the assessment of the situation, geodetic survey of selected pylons of power grid that showed the greatest deformation was performed. On taken images, deformation of steel structures by using the FOTOMNG system was also analyzed. The proposed method allows a modeling of the structure of the object based on precisely obtained photographic documentation of the current state. It also represents a very effective method which allows to quickly and efficiently analyze the deformation in the structure of Extra-High Voltage pylons in the critical position of the power grid. Other benefits include the possibility of repeatable and safe measurement.Web of Science62232932