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Research Article: Alternative Method to Determine Extreme Hydrodynamic Forces with Data Limitations for Offshore Engineering

Research Article: Alternative Method to Determine Extreme Hydrodynamic Forces with Data Limitations for Offshore Engineering

Journal of Waterway, Port, Coastal, and Ocean Engineering, Vol. 145, Issue 2 (March 2019)

https://doi.org/10.1061/(ASCE)WW.1943-5460.0000499

Abstract:

This study aims to identify limitations during hydrodynamic forces estimation in offshore design standards, such as the RP 2A-WSD-2014, and presents an alternative method to estimate the hydrodynamics forces considering nonlinearities due to ocean–atmosphere interaction. La Guajira, Colombia, was the location as a study case for the proposed method. Simulating waves nearshore (SWAN) and Delft3D models were adapted for three scenarios of extreme waves. The calculation of hydrodynamic force profiles through the RP 2A-WSD-2014 method and the proposed method shows that the traditional method cannot reproduce current profiles associated to hydrodynamic nonlinear interactions. The analysis included sensitivity tests for the hydrodynamic model data; also, a structural numerical model using SAP2000 was built to assess the structural stability of a ductile monopile structure (stress and deformation analysis). The structural model intends to generate a contribution for predesign and reliability considerations. Finally, the method contributes to solve the data restrictions and guide to engineers to set objective security factors considering the theoretical profiles and numerical modeling.

Keywords:  Offshore structures; Hydrodynamic forces; Offshore engineering; Numerical modeling; Structural analysis.
 

ACI Student Chapter at Universidad del Norte

American Concrete Institute (ACI) Student Chapter at Universidad del Norte was approved on December 18, 2017. Congratulations for all our CE (Civil Engineering) undergraduate students!

http://www.concrete.org/

Research article: Evaluation of tangential and radial stresses on thick walled concrete cylinders under internal pressure

Research article: Evaluation of tangential and radial stresses on thick walled concrete cylinders under internal pressure:

http://rcientificas.uninorte.edu.co/index.php/ingenieria/article/view/9183/10938

Abstract:

This article evaluates the relationship between the radial stress and tangential stress when a hollow cylinder is subjected to an internal pressure (pi). In previous research, authors reported a new methodology to generate a tension strength test in hollow concrete cylinders. As a novel method, to understand the stress behaviour on the probe, it is important to establish relationships between these stresses and its correlations.

This article reflects how these stresses vary according to the different internal radius (ri) for hollow cylinders. As result of this evaluation, it was found that the value of tangential stress at any point is equal to the minimum tangential stress (it is present at the outer surface of the hollow cylinder) plus the value of the radial stress at the evaluation point. The maximum tensile stress always occurs at the internal surface of the cylinder and at a value for tangential stress higher than pi.

Keywords: Concrete, pressure, radial stress, tangential stress, tension. 

ASCE Student Chapter at Universidad del Norte

American Society of Civil Engineers (ASCE) Student Chapter at Universidad del Norte was approved on October 3, 2017. Congratulations for all our CE (Civil Engineering) undergraduate students!

http://www.asce.org/

Certificate

 

Muros delgados

El profesor Carlos Arteta, miembro del GIEG, estará realizando una presentación sobre muros delgados en el "International Workshop on Structural Concrete" (14 de octubre de 2017). Este Workshop se lleva a cabo dentro de la "ACI Fall Convention 2017" que se lleva a cabo en Anaheim, CA, USA. Se adjunta documentación que puede ser de su interés. 

Programación y expositores: https://www.concrete.org/Portals/0/Files/PDF/10th%20International%20Workshop.pdf