Determination of Coefficient Behavior in Structures with Discontinuity in Shear Walls under Seismic Loading

Abstract

Based on experience of past earthquakes, irregularity in building is one of the major cause has been damages to structures. One of these irregularities is the discontinuity of vertical elements such as displacement of position of shear wall in height, considering that in design versus lateral forces, the forces applied to buildings should be transferred from the point of their effect through the whole system to the ground, and the path of forces must be completed. Where, there is an interruption in the normal transition of forces, problems have occurred. Weak story or torsion effects created in floor of building. In multi-story buildings, columns and shear walls must be positioned along each other. With considering the limitations of codes and architectural requirements, there is a question in minds of engineers that it is possible to violate this common rule and to design discontinued shear wall in height. Although, Iranian code No.2800 (Ver.4) warned against the design and use of buildings with discontinues shear wall and recommended these types of systems should not be applied. Therefore, in this research, the seismic behavior of irregular flexural concrete frames in terms of discontinuity in shear wall have been evaluated. Also, building coefficient of behavior, displacement control an irregularity effects in seismic behavior of frames have been considered. What is important in this research, moving the shear wall in which floor can have the least effect on structural response. In this study, models analyzed under nonlinearity statically condition with using SAP 2000 program.

Keywords

• irregularity
• Discontinuity
• Shear wall
• Behavior coefficient