Modal analysis of sandwich panel with composite laminated faces

A sandwich panel with laminate faces was used for free vibration analysis. The Shear Deformation Theory is considered for analysis. The effect of sandwich design parameters such as core thickness and fiber reinforced angle on vibration response is investigated. The modal analysis for various lengths of sandwich panel is done to find the limit length of the panel, which is sensitive to dynamic wind load

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

Mixed-Mode Delamination Failure Model of Sandwich Plate

Plane fracture of two plies is defined as delamination that can be found between plies in a laminate or sandwich structure. The interface model is solved using fracture and contact mechanics. Within the standard First-Order Deformation Theory of laminates, the mixed-mode delamination failure model is solved. The damage propagation parameters are calculated using the ANSYS code. The delamination problem is solved in a numerical example

Seismic response of waste storage tanks

Ground- supported cylindrical tanks are used to store a variety of liquids. This paper provides the theoretical background for takes into account impulsive and convective (sloshing) actions of the fluid in concrete containers fixed to rigid foundations; it has been adopted in Eurocode 8. Seismic responses – base shears, the bending and overturning moments – are calculated by using the response spectra of the earthquake in Loma Prieta, California. As the examples is analyzed the ground supported cylindrical concrete tanks, where for constant fluid filling H, R are depended from parameters tank slenderness ratio γ = H/R

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

Analysis of the peak vertical displacement of liquid surface due to sloshing

When a tank containing liquid vibrates, the liquid exerts hydrodynamic effects on the solid domain of a tank. In the case of roof tanks, a large sloshing wave will impact the wall or roof of the tanks and may cause extensive damage or failure of the tanks. This paper provides the theoretical background of simplified seismic analysis of liquid storage cylindrical ground -supported tanks, and it documents the seismic effect of input motions characteristics on fluid sloshing behaviour

Analysis of the peak vertical displacement of liquid surface due to sloshing

When a tank containing liquid vibrates, the liquid exerts hydrodynamic effects on the solid domain of a tank. In the case of roof tanks, a large sloshing wave will impact the wall or roof of the tanks and may cause extensive damage or failure of the tanks. This paper provides the theoretical background of simplified seismic analysis of liquid storage cylindrical ground -supported tanks, and it documents the seismic effect of input motions characteristics on fluid sloshing behaviour

Experimental and numerical analysis of ceiling panel deflection

The subject matter of the article is the comparison of behaviour of the actual ceiling panels exposed to an aggressive environment and the software-modelled panels while their functioning conditions taken into account are identical. The article presents the comparison based on deflections obtained on the ceiling panels. Comparison is expressed by analysis of the panel load-deflection relation