Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 2

Rayleigh Related Publications

2 Effect of Shear Wall Openings on the Fundamental Period of Shear Wall Structures

Authors: A. Touqan, Anas M. Fares

Abstract:

A common approach in resisting lateral forces is the use of reinforced concrete shear walls in buildings. These walls represent the main elements to resist the lateral forces due to their large strength and stiffness. However, such walls may contain many openings due to functional requirements, and this may largely affect the overall lateral stiffness of them. It is thus of prime importance to quantify the effect of openings on the dynamic performance of the shear walls. SAP2000 structural analysis program is used as a main source after verifying the results. This study is made by using linear elastic analysis. The results are compared to ASCE7-16 code empirical equations for estimating the fundamental period of shear wall structures. Finally, statistical regression is used to fit an equation for estimating the increase in the fundamental period of shear-walled regular structures due to windows openings in the walls.

Keywords: Concrete, modal analysis, Earthquake-Resistant Design, SAP2000, finite element, shear wall, fundamental period, linear analysis, Rayleigh, lateral stiffness, ASCE7-16

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1 Contour Estimation in Synthetic and Real Weld Defect Images based on Maximum Likelihood

Authors: N. Nacereddine, M. Tridi, N. Oucief

Abstract:

This paper describes a novel method for automatic estimation of the contours of weld defect in radiography images. Generally, the contour detection is the first operation which we apply in the visual recognition system. Our approach can be described as a region based maximum likelihood formulation of parametric deformable contours. This formulation provides robustness against the poor image quality, and allows simultaneous estimation of the contour parameters together with other parameters of the model. Implementation is performed by a deterministic iterative algorithm with minimal user intervention. Results testify for the very good performance of the approach especially in synthetic weld defect images.

Keywords: Likelihood, Gaussian, Rayleigh, Contour

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