Numerical static analysis of the curtain wall with light steel structure

This paper presents a numerical analysis of the effect of wind on the curtain wall in a high building. Two types of curtain wall were adopted: made of thin-wall C sections with nominal dimensions and the section that takes into consideration lower limits specified by the manufacturer

Analysis of a selected node of a truss made of cold-rolled sections based on the finite element method

The study presents a comparative analysis of displacements and reduced stresses that occur in the selected node of a truss made of cold-rolled sections. Computations were based on the finite element method using the Autodesk ROBOT Structural Analysis and ANSYS Academic Research Mechanical software. Analysis of the status of the selected node was performed for permanent and variable loads

Computer aided design – comparative analysis of widely available software with analytical method

In this article a comparative analysis was performed between analytical method and widely available computer programs employed in beam design like: ADINA, Robot Structural Analysis, Intersoft R2D2 and RM-WIN. In the analysis a simple case of a simply supported beam and uniformly distributed load over the length of the span was assumed. The conclusions from analysis are presented at the end of the stud

Numerical analysis of dynamic force acting perpendicularly on a wall made of concrete blocks with rubber inserts

In this paper numerical analysis considering the influence of dynamical force acting on wall made of concrete blocks with rubber inserts is presented. By examining the stress values on front and back surface of the analysed wall structure model, the effectiveness of proposed solution can be measured comparing to the wall made of concrete blocks without rubber inserts. Complete numerical analysis was performed in ADINA program

Coefficients of reflection and transmission of transverse and longitudinal acoustic wave in the Blatz-Ko material

The purpose of this paper is to analyze the propagation of transverse and longitudinal acoustic wave in a composite made of hyperelastic Blatz-Ko material. Composite consists of a homogeneous layer of predetermined thickness d separating two infinite homogeneous material areas. In the paper it is assumed that the middle layer is filled with a homogeneous rubber (ƒ=1), whereas the external areas with foam rubber (ƒ=0). The final effect of paper are graphs of coefficients reflection of transverse and longitudinal acoustic wave, propagating in this composit

Troweling of Concrete Surfaces – Contemporary Methods

The paper presents an analysis of the process of troweling concrete surfaces using the disc power trowel machines. The quantitative parameter of the disc effect of the disc is its geometric efficiency Sg . The algorithm for calculation of geometric efficiency Sg by simulation method is presented. The analytical formulas for calculation of geometric efficiency Sg for the solid disc and the ring for uniform linear motion at constant rotational velocity are presented.The possibility of converting geometry of the working element to approximate geometry (in terms of geometric efficiency) with the form of concentric rings with center in the middle of the rotation of the disc is presented. The size of the ring was determined by a parameter called the filling factor w. This record allows to calculate the value of the geometric efficiency of the disc's effect by the analytical method as the sum of the geometric efficiency of all. The methodology of numerical calculation of the widths of overlapping of machining areas for neighboring disc tracks has been presented to ensure the highest homogeneity of machining. The adopted objective function to optimize the uniformity of machining is to minimize the index of standard deviation of the geometric efficiency εSg . The geometry of the real working elements most often used for troweling in the aspect of uniformity of machining was analyzed. The method of the optimization of geometry with the assumed kinematic parameters was indicated in order to obtain the best quality of surface machining

Comparative numerical analysis of obtained stress and displacement results from FEM programs - Robot Structural Analysis and ADINA in example of a steel footbridge subjected to the dead load

In this paper the comparative analysis of obtained stress and displacements results from two different FEM programs – Robot Structural Analysis and ADINA was performed. As a subject of the analysis, the numerical model of the arch footbridge in steel construction was adopted

Analysis of the Mechanical Wave in the Composite Made of Concrete and Rubber - Numerical Analysis

In this paper dynamic numerical analysis concerning mechanical wave intensity reduction via rubber material insert/inject in a typical wall concrete block is discussed. Numerical model consists of a single block with a rubber strip and rounded cuboids inserted/injected from the top to the bottom surface of that block. Due to adopted rubber inserts/injects dimensions and cross section area, influence on concrete block compressive strength can be neglected. Mechanical wave propagation is forced through an impact of inclined concentrated force applied to the front block surface on the offset from side block surface. That impact load arises in a very small time step and furtherly its value is changed to zero. According to that mechanical wave propagation may be observed in the form of stress plots plotted in a given time step. Through the numerical analysis it is shown that in case of composite made of concrete-rubber there is a possibility to reduce the mechanical wave propagation by around 25% in comparison to the solid concrete block

Assessment of the Possibility of Using the Tensegrity System in the Steel Tower Structure

Tensegrity structures, due to their lightness and high stiffness, have been popular among architects and constructors for many years. When designing building and engineering structures, the most important stage of designing is the selection of the appropriate structural system depending on the purpose and location of the designed facility. When selecting the load- bearing structure, designers are guided by the smallest possible weight of the structure, while ensuring the safe operation of the facility, meeting all strength conditions. The article presents an analysis of the effectiveness of using the tensegrity structure for the load-bearing structure of a tower in a steel structure. The assessment of effectiveness was carried out taking into account the economy of execution and the fulfillment of the ultimate and serviceability limit conditions of individual elements of the structure for the load-bearing system of the tensegrity structure. Numerical calculations and cross-section dimensioning were performed using the finite element method in RFEM, modeling the structure in 3D

Analysis of the Use of Tensegrity as Display Postuments in Museums

Tensegrity structures, due to their high stiffness and lightness, have been interesting for designers and architects for decades. The key stage of each design is the selection of the optimal structural system, the task of which is to ensure the load-bearing capacity and meet the visual expectations of modern museums and traditional exhibitions. The article analyzes the use of the tensegrity structure as display pedestals in museums due to its stability and load-bearing capacity. Numerical calculations of the analyzed structural systems of museum pedestals were performed using the finite element method in RFEM. After the analysis, it can be concluded that a properly selected tensegrity structure for the construction of a museum pedestal is an interesting solution worth considering when designing