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International Concrete Sustainability Conference


La próxima semana se tendrá en la ciudad de Medellín un interesante evento internacional asociado con la temática de concretos y ciudades sostenibles. El evento cuenta con apoyo de importantes empresas del área de concretos.

International concrete sustainability conference
 

https://drive.google.com/file/d/0B1XoK7o8uO9dOUNZUHJIWWFMUjA/edit?usp=sharing

Beca para Doctorado en Ingeniería Civil - COLCIENCIAS - Uninorte

 

El programa de Doctorado en Ingeniería Civil de la Universidad del Norte, a través de sus grupos de investigación TRANVÍA, IDEHA y GIEG, fue beneficiario de una beca completa de COLCIENCIAS para un periodo máximo de 4 años (matrícula, sostenimiento, pasantía).

Si se desea más información, favor dirigirse al siguiente vínculo:

http://www.uninorte.edu.co/web/apoyo-financiero/detalle-de-producto?product=2992

Rúbrica

Teniendo en cuenta que los programas de pregrado en Uninorte cuentan con la acreditación de ABET, es interesante conocer un poco más sobre el orígen de la palabra "rúbrica", empleada en el sentido del listado de criterios guía para calificar documentos académicos:

"Centuries ago, whenever manuscript writers inserted special instructions or explanations into a book, they put them in red ink to set them off from the black used in the main text. (They used the same practice to highlight saints' names and holy days in calendars, a practice which gave us the term "red-letter day.") Ultimately, such special headings or comments came to be called "rubrics," a term that traces back to "ruber," the Latin word for "red." While the printing sense remains in use today, "rubric" also has an extended sense referring to any class or category under which something is organized" Fuente: Merriam-Webster's Word of the Day

Fluid Pressured Test to Measure Tensile Strength of Concrete

A fluid pressured test has been developed as an alternative to measure tensile strength of concrete. This test method covers the determination of the tensile strength of cylindrical concrete specimens with a centered internal hole where a radial internal fluid pressure is applied until failure occurs. This loading condition induces tangential stresses on the specimen; the maximum fluid pressure sustained by the specimen is affected by appropriate geometric factors to obtain a measurement of the tensile strength. Preliminary experimental data suggests that the tensile strength measured with the proposed method is about 17% greater than the tensile strength obtained from splitting tensile tests. Additionally, results of the tensile pressure strength were in average 11% of the compressive strength.

 

Reference: Cantillo, V. and Guzmán, A. (2013). "Fluid Pressured Test to Measure Tensile Strength of Concrete." J. Mater. Civ. Eng., 10.1061/(ASCE)MT.1943-5533.0000849 (May. 9, 2013).

Evaluation of the slenderness ratio in built-up cold-formed box sections

Abstract: According to section D1.2 of AISI S100-2007 for compression members composed of two sections in contact whose buckling mode involves shear forces in the connectors, a reduction must be made, KL/r must be replaced by (KL/r)m. This new modified slenderness ratio takes into account the connection weld spacing and the minimum radius of gyration of an individual shape in the built-up member. Under the provisions of section D1.2 a reduction in load capacity must be made for built-up welded box members, which are the subject of this study. An experimental investigation on 48 samples was addressed to determine the comparative behaviour under compression load of box sections composed of two C-section members in contact by seam welds with different weld spacings (ranging from 100 to 900 mm). The studs were tested simulating rigid and flexible end support conditions. The length of the samples was 900 mm with a cross-section of 100 mm×100 mm. The base material thickness was 1.5 mm (gauge 16) for 24 samples and 2.0 mm (gauge 14) for the rest. The testing done on the samples did not show a statistical reduction in the ultimate compression load capacity for these members except for a weld spacing of 900 mm and a flexible end support condition. The reduction considered in AISI S100-2007is not applicable to determine the ultimate load capacity for the rest of the members.

Highlights: ► Revision of section D1.2 of AISI S100-2007 for built-up compression members. ► Studs tested simulating rigid and flexible end support conditions. ► The compression load capacity for members tested is analysed statistically. ► Increasing the value for “a”, the predictive capacity curve diminishes. ► The reduction considered in AISI S100-2007 is not applicable for members tested.