Stiffness Evaluation of Reinforced Concrete Shear Wall With Respect to Shape, Height and Thickness

Abstract

The Reinforced concrete shear wall structure is now widely accepted as a rational and economical form of multi-story construction projects. Recent years have seen throughout the world a rapid increase in the number of multi-story structures, for both commercial and residential purposes. This rapid growth has intensified the need for greater knowledge all of the structural behaviour of Reinforced Concrete shear walls. From the Analysis of reinforced shear wall, in consideration of shape, height and thickness result different stiffness, these values can ultimately affect the behaviour of a structure under seismic loads and lateral forces that will be applied to it. At first, different two configurations of the same shape shear walls in the plan were analysed in both perimeter and core of buildings. In both cases, models with a central concrete core showed higher stiffness and smaller lateral displacements under the same lateral force on the same symmetrical building. Secondly, all the possible core shear wall shape equal thickness and area where analysed and compared. The rectangular-closed box which has 6.25% opening the opening did not show a significant influence on their stiffness of the shear wall shows maximum stiffness. Then consider a shear wall dimensions of 150mm, 200mm, 300mm and 400mm in thickness, and 18m, 33m, 48m and 63m in height, The results indicated an increase thickness and height of shear increase in corresponding stiffness. The varying thickness and height are compared such as 200mm thick x 60m height with 400mm thick x 30m height, and 300mm thick x 60m with 400mm thick x 45m height. Results showed that the 400mm thick x 30m and 400mm x 45m have high stiffness values. The analysis for all the models was performed using ETABS 16 Version Software to create a 3-D model, and run the linear static analyses. Based on the findings of the study, it is concluded that in case where the structure is symmetric in plan and centre of mass is not far away from a centre of rigidity (in other words, significant torsion is not generated in the structure), there is no need to insist on placing the shear walls at the perimeter of the plan. In fact, if minimum lateral displacements and higher stiffness are required priorities by using the same number of shear walls. Likewise, it can be increase or decrease the height and thickness of shear wall or either of the two depending on stiffness required.