Eva Kormaníková

Dynamic Time-History Response of Cylindrical Tank Considering Fluid - Structure Interaction due to Earthquake

Ground-supported cylindrical tanks are used to store a variety of liquids. The fluid was develops a hydrodynamic pressures on walls and bottom of the tank during earthquake. This paper provides dynamic time-history response of concrete open top cylindrical liquid storage tank considering fluid-structure interaction due to earthquake. Numerical model of cylindrical tank was performed by application of the Finite Element Method (FEM) utilizing software ADINA. Arbitrary-Lagrangian-Eulerian (ALE) formulation was used for the problem analysis. Two way Fluid-Structure Interaction (FSI) techniques were used for the simulation of the interaction between the structure and the fluid at the common boundary

Finite Element Analysis of Damage Modeling of Fiber Reinforced Laminate Plate

The paper deals with identifying of the damage model for a bundle of T300 and AS4D fibers under tensile load. The damage model is implemented in ANSYS for a one-dimensional bar element and obtained the strain-stress response of a bundle of fibers. The delamination of laminate plate, which consists of unidirectional fiber reinforced layers, is investigated. The methodology adopts the first-order shear laminate plate theory and fracture and contact mechanics. Within the interface modeling there are calculated the individual components of energy release rate along the lamination front. Numerical results are given for mixed mode delamination problems. Numerical example is done by the commercial ANSYS code.

The Study of Seismic Response on Accelerated Contained Fluid

Ground-supported cylindrical tanks are strategically very important structures used to store a variety of liquids. This paper presents the theoretical background of fluid effect on tank when a fluid container is subjected to horizontal acceleration. Fluid excites the hydrodynamic (impulsive and convective) pressures, impulsive and convective (sloshing) actions. Seismic response of cylindrical fluid filling tanks fixed to rigid foundations was calculated for variation of the tank slenderness parameter. The calculating procedure has been adopted in Eurocode 8.

Hydrodynamic Analysis of Fluid Effect in Rigid Rectangular Tank due to Harmonic Motion

Ground-supported tanks are used to store a variety of liquids. This paper deals possibility numerical modelling reciprocal interaction moving container with fluid in under consideration horizontal harmonic motion reservoirs. It clarify watched phenomenon, illustrate pressure process at a walls of container, from witch it results action of force at a container. The numerical problem analysis is comparing with realised experiment, where steady state motion of fluid was watched and his maximum wave of fluid on the walls of reservoirs.

Dynamic analysis of liquid storage tanks

Liquid storage tanks are used to store variety of liquids. This paper provides theoretic background of seismic response liquid storage circular container. Using of theoretic knowledge for calculating of impulsive and convective effects of fluid in liquid storage circular container was calculated the response of earthquake excited tank: the base shears of the wall and the base moments, immediately above and below the tank bottom plate, for full or partially fluid filled tank.Liquid storage tanks are used to store variety of liquids. This paper provides theoretic background of seismic response liquid storage circular container. Using of theoretic knowledge for calculating of impulsive and convective effects of fluid in liquid storage circular container was calculated the response of earthquake excited tank: the base shears of the wall and the base moments, immediately above and below the tank bottom plate, for full or partially fluid filled tank.

Facesheet-Core Interface Delamination in Sandwich Panels

The main objective of the present paper is the characterization of the mixed-mode delamination in sandwich plates. To this purpose a mixed-mode delamination failure model is proposed. Then, the failure model is implemented in ANSYS code to calculate the damage propagation parameters. The analysis is based on the Finite Element Method and interface techniques. Within the interface finite element modeling there are calculated the individual components of spring reaction force, relative displacement and energy rate release along the lamination front.

Interfacial debonds of layered anisotropic materials using a quasi-static interface damage model with Coulomb friction

A new quasi-static and energy based formulation of an interface damage model which includes Coulomb friction at the interface between anisotropic solids is provided. The interface traction-relative displacement response is based on an assumption of a thin adhesive layer whose behaviour is analogous to cohesive zone models. The damaged interface is considered, if exposed to a pressure, as a contact zone where Coulomb friction law is also taken into account. As the contacting solids are generally anisotropic, the friction may exhibit some anisotropic behaviour, too, which is included into the proposed model. The solution of the problem is sought numerically by a semi-implicit time-stepping procedure which uses recursive decoupled double minimisation in displacements and damage variables. The spatial discretisation is based on the symmetric Galerkin boundary-element method of a multidomain problem, where the interface variables are calculated by sequential quadratic programming, being a tool for resolving each partial minimisation in the proposed recursive scheme. Sample numerical examples demonstrate applicability of the described model.

Extreme loads of subsoil and its impact on the optimization of structures

Generally known foundations function is to transfer load effects into the ground. Therefore, in their design, it is important to know not only the structure and load of the building, but also soils properties in the subsoil. Ignoring soil properties may result in an incorrect design of foundation, which may later cause a failure in building structure. In smaller buildings, an engineering-geological survey is not usually carried out, but basic data on the territory is obtained from archive reports. Geologists define recommended dispersion of values for single geology properties, which is reflected in bearing capacity of foundation soil and the dimensions of foundation foot. Base soil monitoring due to varying soil shear strength parameters under on undrained conditions due to consistency change and observation of changing dimensions of base structure confirmed the importance of conducting and evaluating engineering geological surveys for optimal design of the foundation structure.

Multiscale modeling of composite cylindrical tank

This article provides the useful data information on multiscale modeling of liquid storage laminated composite cylindrical tank under seismic load. The investigation process is divided into three levels. Within the numerical homogenization, the hexagonal microstructure one-eighth and full RVE model is assumed on micro-scale level. Homogenization of unidirectional lamina is done in four steps. For effective material properties of the whole laminate, the laminated representative volume element is assumed on meso-scale level. The numerical homogenization is done by using the Finite Element Method in the program ANSYS. Effective modulus of elasticity is taken into the calculation of internal forces of the laminated composite cylindrical tank on macro-scale level. The base shears bottom of tank wall and tank base, the bending moment above the base plate, and overturning moment bellow the base plate as function of the tank fluid filling are presented. Data inform about seismic response of liquid laminated composite tank during seismic even in Slovak Republic, respecting of Eurocode 8 recommendations.

The Possible Causes of Damage to Concrete Tanks, Numerical Experiment of Fluid-Structure-Soil Interaction

Ground-supported open top circular concrete tanks are critical and strategic structures. There tanks are used in the commercial and industrial applications to store a variety of liquids as water or other products such as liquid chemicals and hazardous substance. Damages or collapse of containers may be due to the influence of surrounding aggressive environments or an earthquake. This paper provides numerical model on seismic response of fluid - structure - soil interaction. The article also will be described impact aggressive environment in terms of standards and its impact on the quality of the concrete tank.