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Analysis of Shear wall with Opening : 

Analysis of Shear wall with Opening Presented by Jyoti P. Bhusari

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Shear wall: It is continuous vertical structural member-an important element in high-rise buildings which provides the lateral stability and resists the lateral forces from earthquake and wind forces. Coupled shear wall: When the shear wall has vertical rows of openings created by windows and doors, coupled by connecting beams it is called coupled shear wall.

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Coupled shear wall: When such two or more shear walls are interconnected by a system of beams or slabs, the total stiffness of the system exceeds the summation of the individual wall stiffness because the connecting slab or beam restraints the individual cantilever action by forcing the system to work as composite unit. Such an interacting shear wall system can be used economically to resist lateral loads in buildings up to about 40-stories (Taranath 1998).

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Shear wall with openings: There are various types of opening shape due to architectural and planning requirement . However, due to ease of analysis, design and construction, regular shapes with openings throughout the height are preferred by the engineers.

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There are several types of analysis methods available for analyzing shear walls structure. The analysis can be made in elastic, elasto-plastic and ultimate condition. However, due to uncertain and in-ability to analyze and interpret the post elastic behavior or possibly time constraint, the elastic method is preferred for its simplicity.

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These elastic method of analysis can be Continuous Connection Method (CCM) Transfer Matrix Method Wide Column Analogy (WCA) or frame analysis Finite Element Method Discrete Force Method.

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Finite Element Method is widely used for analyzing complicated structural systems. The selected structural model must be simple, produce accurate result and be economical. Different elements used in modeling shear walls: beam/column element *(simplest element used for frame structure) two dimensional element shell element solid element.

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Important factors affecting the analysis of shear wall structure : the type and number of elements the distribution of the forces geometry and section properties and arrangement of members.

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The aim of this study is to investigate the suitability, simplicity, accuracy; effectiveness of simple and complex (in terms of higher order elements and level of refinement of meshing) FE models used in the analysis of shear wall and coupled shear wall structures. Commercially available software is being used for static and dynamic analysis of shear wall without and with openings of different sizes and arrangements.

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Here a wall 35 m high (10 storey at 3.5 m), 6m long and 200 mm thick is considered. Not carrying a rigorous analysis for lateral and vertical loads, an axial load of 1000 kN and lateral load of 100kN are applied at the top of the wall Analysis is to be carried out by considering different elements and also for series of increasingly finely meshed versions of the models

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Comparing stresses for increase in aspect ratio of a room with openings Comparing stresses based on whether the maximum stresses occur in the short wall or long wall of the room Comparing stresses with the increase in no of openings in a wall keeping total area of openings same. Comparing stresses with respect to the position of the opening The structural behavior in all cases will be studied in terms of deformation, stresses distribution along with the dynamic characteristics , and will be presented in the paper

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References: Hui Wu & Bing Li, “Investigating the load paths of RC shear wall with openings under reversed cyclic loadings”, (2003) Pacific Conference on Earthquake Engineering. Arnot, K.,, Shear Wall Analysis-New modelling; Same answers, Journal of Structural Engineering- February2005. H.-S. Kim, D.-G. Lee, “Analysis of shear wall with openings using super elements”, Engineering Structures 25 (2003) 981–991 Hong Guan, Carlia Cooper, Dong-Jun Lee, “Ultimate strength analysis of normal and high strength concrete wall panels with varying opening configurations”, Engineering Structures 32 (2010) 1341_1355 .

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