Research on Engineering Structures and Materials

59-66

Authors: Ferhat Erdal, Osman Tunca, Serkan Taş

Cellular beams became increasingly popular as an efficient structural form in steel construction since their introduction. Their sophisticated design and profiling process provides greater flexibility in beam proportioning for strength, depth, size and location of circular holes. The purpose of manufacturing these beams is to increase the overall beam depth, the moment of inertia and section modulus, which results in greater strength and rigidity. The objective of this study is to carry out non-linear finite element (FE) analysis of the cellular beams that were considered in the experimental study in order to determine their ultimate load carrying capacity for comparison. The finite element method has been used to predict their entire response to increasing values of external loading until they lose their load carrying capacity. FE model of each specimen that is utilized in the experimental studies is carried out. FE models of steel cellular beams are used to simulate the experimental work to verify of test results and to investigate the non-linear behavior of failure modes such as web-post buckling, shear buckling and vierendeel bending of beams.

75-87

Authors: Ahmet Kesimli, Süleyman Murat Bağdatlı, Seyit Çanakcı

In this study, linear vibration of fluid carrying pipe with intermediate support was discussed. Supports located at the ends of the pipe were clamped supports. A support was located in the o0middle section show the features of a simple support. It was accepted that the fluid velocity varied harmonically by an average speed. The equation of motion and limit conditions of the system were obtained by using Hamilton principle. The solutions were obtained using the Multiple Scale Method, which is one of the Perturbation Methods. The first term in the perturbation series causes the linear problem. Exact natural frequencies were calculated by the solution of the linear problem for the different positions of the support at the center (η), different longitudinal stiffness (vb), different pipe coefficient (vf), different rate of fullness (β) and natural frequencies depending on velocity of the fluid (v0) were calculated exactly. The obtained results were shown in graphics.