Comparison between Analytical Equation and Numerical Methods for Determining Shear Stress in a Cantilever Beam

A three meter-length cantilever beam loaded with a concentrated load at its free end is studied to determine shear stresses. In the present study, three cross sections are considered: rectangle (R); I, and T. The study presents a comparison of maximum shear stresses obtained by means of two methods: classical analytical equation derived by Collingnon, and finite element method (FEM) software. Software programs ANSYS and SAP2000 were used. The results show difference between the maximum shear stresses obtained by the analytical equation and the software, being the last is always higher. The average differences for ANSYS and SAP2000, independently of the cross section, were 12.76% and 11.96%, respectively. Considering these differences, correction factors were proposed to the classical analytical formula for each cross section case to obtain more realistic results. After the correction, the average differences decrease to 1.48% and 4.86%, regardless of the cross section shape

The Effect of Number of Storey's and Columns Dimensions on the Accuracy of Tributary Area Method

In recent years, the utilization of computer techniques in engineering application has become an irreversible trend. This is achieved through using computer as the device for modeling, analysis, and design. The study mainly has focused on the accuracy of the tributary area method for estimation load , as compared to finite element method by SAP2000, considering the effect of building overall height (i.e. number of storey's) from 1 to 10 and column dimensions (i.e. stiffness) from 20×20 cm to 70×70 cm. According to the analysis of the data obtained, we can see the error in the load computed by the tributary area approximation becomes relatively larger as the number of storey's increases, especially for the lateral load calculations, and the stiffness of the columns increases, the predictions using the tributary area method improves for both axial and lateral forces in the columns

The Possibility of Utilization of Tamper-evident Bands (TEB) as Fibers in Concrete Blends

The impact of tamper-evident bands (TEB) as fiber on the distinctive properties of concrete was examined through a few laboratory tests. In this study, the tamper-evident band (TEB) is the plastic ring left around the neck of bottled drinking water. The properties examined incorporate workability, compressive strength, flexural strength, and splitting tensile strength at 7 and 28 days of moist curing. Three varied fiber volumes were added to concrete mixes at 0.5%, 1.0%, and 1.5% by volume of concrete. The test results show that the employment of 1% (TEB) fibers by volume of concrete lead to the increment of flexural and splitting tensile strengths of concrete 34.5% and 38.56% respectively in comparison to the reference concrete at 28 days of moist curing.nbsp; It can be inferred, according to a preliminary analysis, that tamper-evident bands (TEB) are modern forms of fibers that have a good effect on the improvement of concrete's tensile properties