Strength capacity of hollow clay blocks structural masonry - Flange, Chases, and slenderness effects. (1st December 2022)

• Record Type: Journal Article
• Authors: Fleith de Medeiros, Guilherme; Mohamad, Gihad; Eduardo Kosteski, Luis; Quispe Rodriguez, René; Simonetti Milani, Alisson
• Is Part Of: Engineering structures. Volume 272(2022)
• Publication Date: 2022-12-01
• Subjects: Masonry Structures -- Mechanical Behavior -- Finite-element Method -- Numerical Model -- Strength Reduction Factor -- Slenderness -- Flange; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2022.114943
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Unplanned chases made for the passage of pipes compromise the structural security. Disregarding the chase thickness to determine slenderness wall is inadequate. Disregarding the chase thickness to determine strength reduction factor is inadequate. Strength prediction for walls is established using the chase thickness percentage. Strength prediction for walls with flanges and chases considers height/length ratios. Abstract: Unplanned chases made in structural masonry for the passage of pipes can compromise the overall strength of the structure. This interference does not have clearly established and uniform criteria in Brazilian and international standards for assessing the deformability and consequent safety reduction of the walls. The present study evaluates numerically, by using the Finite Element Method (FEM) and fitting procedures, the effect of chases in masonry walls elements, proposing a method to preview walls strength reductions with the presence of chases. Thus, an additional criterion for the reduction factor ( R ) due to the masonry slenderness is presented. The contribution of the flanges is also evaluated for different height/length ratios. The simplified approach of disregarding the chase thickness of the wall determine its slenderness ( λ ), and consequently the strength reduction factor ( R ), was invalidated in the present study, considering that the numerical models provided lower reduction coefficients for any wall group studied. The slenderness of the walls considering the residual wall thickness in the chase region must be limited to 33.