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Currently, there are different options to increase the ultimate resistance of plate girders subjected to patch loading. Some of these alternatives include the use of closely spaced transverse stiffeners and the use of longitudinal stiffeners. Nevertheless, recent investigations have demonstrated that the resistance is also improved by using delta stiffeners, which are obtained by welding two plates between the web plate and the loaded flange. This paper aims at studying the elastic buckling behavior of slender plate girders designed following AASHTO norms with delta stiffeners subjected to patch loading. The research is carried out by means of eigenvalue analysis using the finite element method. A parametric study is performed to evaluate the influence of various geometrical parameters on the buckling coefficient of the girder. Finally, design recommendations are suggested based on the obtained results. [ABSTRACT FROM AUTHOR]

For years concrete slabs have been built on steel beams, however, not considering the transmission of shear forces between them, causes the elements to work separately. To ensure the transmission of forces, the load must be transmitted through mechanical connectors. In construction, stud bolts, angle profiles and screws are commonly used as connectors, although not all of them are standardized. The present work analyzes the behavior of angle shear connectors when they are located in a different way than stated in design codes. For this study, angle share connectors were considered placed perpendicular to the face of the steel beam skid; analyzing two types of positions (45 and 90° referring to the longitudinal axis of the flange). In order to check which one has adequate behavior and resistance, push-out tests were carried out, with a total of 6 specimens per position. The shear force vs. slip curves obtained from the connector at 45 ° showed a more homogeneous behavior in all the parameters analyzed compared to the curves obtained for the connector at 90 °. Its optimal performance makes the 45 ° connector the most suitable for implementation. [ABSTRACT FROM AUTHOR]

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Copyright of DYNA - Ingeniería e Industria is the property of Publicaciones Dyna SL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The article titled "FIRST STEPS IN THE DESIGN AND CONSTRUCTION OF A LOW-COST WAVE CHANNEL" presents the first advances in the design and construction of a low-cost wave channel. The wave channel consists of 4 removable sections with 5 mm thick glass and rectangular flanges cut in acrylic of the same thickness. A piston wave generator controlled by a graphical application on a personal computer was used, which sends commands through a cable to the maneuvering drive controlled by an Arduino. The objective is to simulate ocean waves in medium-depth waters using low-cost materials and circuits. [Extracted from the article]