scholarly journals ANALYTICAL STUDY ON ELASTO-PLASTIC DEFORMATION BEHAIVOURS OF MULTISTORY REINFORCED CONCRETE STRUCTURES WITH CANTILEVER SHEAR WALLS : Part 1 Analytical method

1984 ◽  
Vol 339 (0) ◽  
pp. 1-10
Author(s):  
KIYOSHI MASUO ◽  
ISAMU ABE ◽  
MASAFUMI SHIN
Keyword(s):  
Plastic Deformation ◽  
Reinforced Concrete ◽  
Analytical Method ◽  
Analytical Study ◽  
Concrete Structures ◽  
Shear Walls ◽  
Reinforced Concrete Structures

scholarly journals Experimental and analytical study of bio-based epoxy composite materials for strengthening reinforced concrete structures

2021 ◽  
Vol 28 (1) ◽  
pp. 335-342
Author(s):  
Jules Assih ◽  
Ivelina Ivanova
Keyword(s):  
Reinforced Concrete ◽  
Adhesive Joint ◽  
Analytical Study ◽  
Natural Fiber ◽  
Concrete Structures ◽  
Fiber Composites ◽  
Shear Stresses ◽  
Reinforced Concrete Structures ◽  
Natural Fiber Composites ◽  
Bending Load

Abstract This paper presents a new approach to strengthen reinforced concrete structures using natural fiber composites. Natural fibers are often used in civil engineering for thermal or acoustic insulation, but rarely are they employed to strengthen structures. Natural fiber composites are constituted of a matrix based on epoxy adhesive and aligned continuous fiber reinforcements. In this study, we investigate several fibers (carbon, hemp, fiberglass, and linen) in tensile and bending tests. The bending results show twice the magnification of the ultimate bending load in a strengthened specimen. The study also evaluates the stress distribution in the structure. In the case of a beam strengthened by a bonded carbon plate, the functioning of an assembly single lap and the optimal anchor length was determined by analogy. The analytical study describes the shear and peel stresses in the adhesive, composite, and concrete joints, revealing the optimum values of shear stress near the ends of the adhesive joint. The same was observed in concrete. The tests showed the influence of strengthening on the ultimate load and stiffness as well as the concentration of shear stresses at the ends of the adhesive joint.

scholarly journals Influence of shear flexibility in structural shear walls on pushover analysis

Mechanika ◽  
2020 ◽  
Vol 26 (2) ◽  
pp. 146-152
Author(s):  
Mário Rui Tiago Arruda ◽  
Bruno Lopes ◽  
Mário Ferreira ◽  
Tadas Zingaila
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Seismic Design ◽  
Pushover Analysis ◽  
Concrete Structures ◽  
Shear Walls ◽  
Reinforced Concrete Structures ◽  
Structural Walls ◽  
Shell Elements ◽  
N2 Method

The aim of this work is to show the main differences which exist, taking in to account the influence of the type of finite element used, when performing pushover analysis of reinforced concrete structures. The non-linear analysis was performed using FE software SAP2000, and the results were extracted from models including Frame and Shell elements, respectively. Several reinforced concrete structures were modelled with Frame elements and Shell elements, which will be further presented. Therefore, it was possible to validate the results obtained from the analysis, also to identify certain restrictions according to the type of finite element used in the modelling of the resistant walls. In the first phase, three isolated structural walls were modelled with distinct geometries. The first one presents a rectangular shape, the second – “L” shape and the third one “U” shape. The application of pushover analysis through the different examples presented in this document, intends to validate the results obtained for the Shell elements. Subsequently, the same kind of analysis was performed on a building. These examples intend to show that the performance of ductility is strongly dependent from the type of element, which is not taken into account in the pushover analysis nowadays. N2 method was applied to all examples, in order to understand the differences in the structures seismic design, according to the type of element used in the modelling. The results are compared, and the differences are identified. As well as, the limitations of applicability of Shell elements in the modelling of structural walls were determined.

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