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The IUP Journal of Structural Engineering :
Performance Evaluation of RC Haunch Beam Frame with Shear Wall
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Beams are the major structural elements that carry and transfer the loads and are designed for bending and shear. Prismatic beams having uniform cross-section are commonly used for short and medium spans, whereas haunched beams are non-prismatic with varying cross-section. Shear wall structural systems are used to increase the stiffness of the structure to resist the lateral loads acting on a structure. The paper considers a 25-storey rigid frame structure and compares the performance of prismatic beams and haunched beams. Also, a comparative study of haunched beam frame with shear wall and without shear wall is made. The structure is analyzed for earthquake loads by both linear and nonlinear analysis using ETABS2015. Linear analysis includes both equivalent static method and dynamic response spectrum method. Nonlinear analysis is performed by pushover analysis. On the basis of the structural parameters studied, the general conclusion is that haunched beams provide more efficient use of concrete and steel reinforcement and reduces the weight of the structure.

 
 

Beams are the major elements for carrying and transferring the lateral and gravity loads in the structure. Prismatic beams which have uniform cross-section are commonly used for short and medium spans. Use of prismatic beams in large span increases the bending moment which further increases the depth of the beam. Increase in depth of the beam reduces the headroom and further leads to the uneconomical construction. Providing non-Prismatic beams with varying cross-sections is one solution for such situations. The cross-section of the beams can be made non-prismatic either by varying the width, depth or both. Varying the cross-sectional width poses difficulty in construction, varying the depth is normally adopted. Effective depth of non-prismatic beams also varies, which makes the analysis of non- prismatic beams different from prismatic beams. Haunched beams are a form of non-prismatic members having varying depths. Haunched beams are frequently used in bridges, portal frames, cantilever retaining walls, etc. Haunched beams are used to make efficient use of concrete and steel, to reduce the weight of the building, to increase the head room, etc. (Tena and Martinez, 2012; and Nampalli and Sangave, 2015).

In shear wall frame interaction system, resistance to horizontal loading is provided by a combination of shear walls and rigid frames. The shear walls are often placed around the elevator and service cores, while the frames with relatively deep spandrels occur at the building perimeter. While the wall frame structure is loaded laterally, the distinctly different deflected forms of the walls and the frames can be quite effective in reducing the lateral deflections to the extent that the buildings up to 50 stories or more are economical (Taranath, 2010). The potential advantages of a wall frame structure depend on the intensity of horizontal interaction, which is governed by the relative stiffness of the walls and frames, and the height of the structure. The taller the building and the stiffer the frames, the greater is the shear wall frame interaction (Rana et al., 2004).

 
 

Haunched beam, Non-prismatic beam, Pushover analysis, Shear walls.