Papers by Keyword: Beam

Abstract: Nowadays a concept of a beam with a corrugated wall in construction mechanics does not exist. Such designs do and they are used in construction. Definition of the intense deformed condition of a beam with a corrugated wall is a relevant task. In this article the task of tension distribution nature assessment in the cross section of a beam in a corrugation height variation was discussed. The task was solved in the course of the numerical experiments with application of the finite element method (FEM). The problem was solved for beams with different shapes of the lines forming a corrugation. It was established that the geometrical form of a corrugation practically didn't influence the nature of tension distribution on a beam section and tension distribution on the cross section of beams with a corrugated wall depends generally on the corrugation height relation to its width.

Abstract: The article describes experimental research of bending rubber fiber concrete elements with favorable deformation-strength characteristics. The use of such a material as fiberrubcon in load-bearing structures due to its high strength leads to a decrease in material consumption and weight of structures.

Abstract: The most frequent research methods applied in various areas of scientific research are computer modelling and numerical simulation. The trend of using finite element method (FEM) gradually replaces classical methods of exploring phenomena. The method is suitable for investigating technical phenomena in the field of construction, mechanics and strength, as well as in other disciplines. Its suitability for the area of ​​strength will be demonstrated in the current paper which presents solutions to various embeddings of a beam under bend. The beam was loaded with an external uniformly distributed load q(x) along its entire length. The research aim was to determine the maximum load and maximum deflection of the beam depending on the beam position and the material used. The beam under bend was selected as the most commonly used structural element. Analytical solution to bending moment and displacement forces is suitable for simple beam loads. Modelling and numerical simulations provide solution to complex problems and different load variations, while identifying changes in material properties of the structural element under consideration. The results are then evaluated and judged on the basis of the maximum strength of the structural material, while meeting the safety condition of the maximum load or maximum deflection. Modelling via FEM is a flexible research method applicable in all research areas.

Abstract: A study has been conducted to investigate the potential use of mengkuang leaves or Pandanus atrocarpus bonded with epoxy resin as external strengthening material for the strengthening of reinforced concrete (RC) beams. Physical and mechanical properties as well as structural properties of the mengkuang leaves-epoxy composite plates (MLECP) were evaluated in this study. Chemical treatment was performed on the dried mengkuang leaves using sodium hydroxide (NaOH) with concentrations of 2%, 5% and 8%. Scanning electron microscope (SEM) and flexural strength tests were conducted on the mengkuang leaves and flexural specimens, respectively. All the beams were tested to failure under four-point loading. Results showed that the flexural strength of the composite with 0.3 fiber volume ratio exhibited the highest flexural strength. Strengthening of RC beam using MLECP managed to increase the beam capacity.

Abstract: In this study, numerical dynamic analysis of E-glass fiber plain weave composite beams with crack under compression is considered. Before understanding the compression effect on the beam, the dynamic characteristics of the models are compared with the experimental evaluations. Results are given in tabular and graphical form.

Abstract: A fire resistant performance is very an important factor for sustaining of the structural stability in a building when the building is covered with a severe fire. In this study, to evaluate the fire resistant characteristics of the beams designed with FR steel and TMC FR steel, a fire engineering method was applied. The results showed that the beam using a FR steel reveals a litter better structural performance than that of TMC FR steel.

Abstract: For axially functionally graded beams with elastic modulus varying through the longitudinal directions, a measurement model for Young's modulus is presented based on the classic Euler-Bernoulli beam theory. When the force and deflection of cantilever beams are measured by the experiment method, the Young's modulus of axially functionally graded beams can be obtained by the measurement model. By the derivation rule of compound functions, the validity of the measurement model is proved. For the axially functionally graded beams with elastic modulus varying according to the power law and the exponential law respectively, the deflection is simulated by the finite element method. The simulated elastic modulus by the model is in accord with the theoretical value well.

Abstract: This article deals with determination of the strain of the beam caused by the creep effect. Instant deflection and simulation of creep function have been examined by SCIA Engineer, ANSYS and Marc software. Creep is a complex phenomenon, which is in every software configured differently. Therefore we would like to compare results of calculations obtained using various finite element method software. With increasing time, the deformation of a beam becomes non-linear analysis. Analysis involved monitoring of deflection in the middle of the beam depending on the time. In SCIA Engineer construction stages were created with the creep factor based on period of load. In the ANSYS software different method was selected and creep curve of concrete had been defined.

Abstract: The article discusses ways to reduce material consumption of I-rolling profile. I-beam profile is made of steel and contains shelves with parallel faces and the wall. Rational distribution of steel cross beam is provided by the fact that the flexibility of its wall which is the ratio of height wall to its thickness does not exceed the limit value of flexibility ensuring sustainability of the wall without intermediate stiffeners, and is 65 for low-alloy steel. Thickness, the height of the wall, limiting its flexibility governed by mathematical dependencies. Sectional area of the profile is distributed in the proportions 50% - wall profile, 25% - each of the shelves. The ratio of flange width to its thickness does not exceed the limit ratio, providing local resistance shelves. Of the work piece cross-sectional area A cm², the same as the prototype, rolled I-beam maximum strength, then there is an increase in the moment of resistance W_x cm³ to about 16% and stiffness by about 37,5%.

Abstract: Beam-like members such as shafts, levers, frame components, beam structures, etc. are regularly designed and constructed in the field of mechanical and civil engineering. It is pertinent to know the structural integrity of the design before construction or fabrication. Beam deflection and stress calculations can be cumbersome and results from commercial simulation packages are not devoid of truncation and/or round-off errors because they are based on numerical schemes. To reduce or eliminate these issues, a computational tool, CABDA, has been designed and developed on matlab. The algorithm is based on analytic equations of beam deflection and bending stress theories; a design flow chart and graphic user interface were done to implement the algorithm. Experiments and simulations have been carried out for steel and brass rectangular beams which were compared with results obtained from CABDA for the same beam model. Average deflection errors recorded for steel beam are-0.4 and-0.015; for brass beam are-0.69 and-0.1 for experiment and simulation respectively. Average bending stress error recorded is-0.19 for simulation. It is observable that simulation results compare closely but CABDA gives exact results and therefore is very appropriate for simple beam problems.