Optimal Section of Spandrel Beams in Coupled Shear Wall System

Teymur Moghaddam, Sassan (2018) Optimal Section of Spandrel Beams in Coupled Shear Wall System. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

Spandrel beams in the coupled shear walls play an important role in the overall behavior of the structure. Conventional spandrel beams, mainly fail in brittle early way due to the formation of shear plastic joints in lateral cyclic loading. Therefore, their proper behavior will improve the performance of the structure against earthquakes. Due to the nature of the spandrel beams, which are mostly sections with high depth and short length, these elements of the instrument are classified in the deep beams group. The large amount of internal forces against the shear is usually based on concrete. On the other hand, due to the brittle behavior of concrete, the shear-slip joints in the beam are created, which are considered as weaknesses in the concrete. A solution to prevent this problem is to transform the behavior of the beam into flexural behavior. In this regard, in this research, the use of two connected beams with the same height with conventional spandrel beam is proposed. Although expecting a reduction in the resistance of the proposed system, but more internal forces are delivered by the longitudinal reinforcement bars, it is expected that in this case, behavior is more smooth and more formidable than the structure. Although a reduction in resistance is expected in the proposed system, but more internal forces are delivered through the longitudinal reinforcement bars, and it is anticipated that in this case, can be see softer and perhaps more ductile behavior in the system. In the process of this research, the overall behavior of the coupled wall with the proposed beams and the type of created plastic joints under the cyclic loading analysis was investigated in the finite element software. The results show the efficiency of the proposed idea and the accuracy of proposed relations in design of these types of beams. In this idea, the aspect of the execution of the desired beam is also considered

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