Behavior Of Coupled Shear Walls Research Articles

Seismic Behavior of Coupled Shear Walls made with Ductile Fiber-Reinforced Cement-Based Composite

Seismic Behavior of Coupled Shear Walls made with Ductile Fiber-Reinforced Cement-Based Composite

On the Behavior of Coupled Shear Walls: Numerical Assessment of Reinforced Concrete Coupling Beam Parameters

Modern construction of high-rise and tall buildings depends on coupled shear walls system to resist the lateral loads induced by wind and earthquake hazards. The lateral behavior of this system depends on the structural behavior of its components including coupling beams and shear walls. Although many research studies in the literature investigated coupling beams and shear walls, these studies stopped short of investigating the coupled shear walls as a system. Therefore, in this research, the effect of the coupling beam parameters on the nonlinear behavior of the coupled shear walls system was investigated. The full behavior of a 10-story coupled shear wall system was modeled using a series of finite element analyses. The analysis comprised of testing several coupling beam parameters to capture the effect of each parameter on system response including load-deflection behavior, coupling ratio, crack pattern, and failure mechanism. The results indicated that a span-to-depth ratio equal to two is a turning point for the coupling beam behavior. Specifically, the behavior is dominated by ordinary flexure for a ratio of more than two and deep beam behavior for a ratio of less than two. This study showed that the coupling beam width does not have a significant effect on the coupled shear wall response. Additionally, it was concluded that the excessive coupling beam diagonal reinforcement could significantly affect the coupled shear walls behavior and therefore an upper limit for the diagonal reinforcement was provided. Moreover, limitations on the longitudinal and diagonal reinforcement and stirrups are presented herein. The analysis results presented in this paper can provide guidance for practitioners in terms of making decisions about the coupling ratio of the coupled shear walls.

The Influence of Single Shear Walls on the Behaviour of Coupled Shear Walls in High-rise Structures

This paper presents a simple method of analysis to determine the influence of single shear walls (SSW) on the degree of coupling DoC and on the peak shear demand PSD for beams of coupled shear walls (CSW) in mixed shear wall structures (MSW). Non-coupled lateral load resisting structures such as singular planar walls will reduce primary bending moments in the coupled shear walls of MSW structures thereby increasing the degree of coupling. They will also change the location and magnitude of the maximum shear in and rotation of the coupling beams. These changes in the coupled wall bents may increase the demand on their performance beyond capacity. It is therefore important to have an indication of the change in the coupling beam design parameters at an early stage of the design. The proposed graphical method is based on the continuous medium theory and allows a rapid assessment of the structural behavior of coupled shear wall bents in mixed shear wall structures that are subject to triangularly distributed horizontal loading.

Investigation into the Behavior of Coupled Shear Walls

An effective design technique for symmetrical coupled shear walls is presented in this paper. The proposed formulation, including assumptions and steps with mathematical formulation, has been elaborated to arrive at the design technique. An example has been considered to validate the technique with the DRAIN-3DX and SAP non-linear analysis. A parametric study has also been considered to find out the limitations of this technique and suggest remedial action. It is concluded that the proposed design technique can be considered in the design of coupled shear walls under seismic motion.

Ductile Behavior of Coupled Shear Walls

The behavior of two quarter full-size seven-story reinforced concrete coupled shear walls, with conventionally and diagonally reinforced coupling beams, subjected to static reversed cyclic loading to simulate seismic effects, is compared in terms of stiffness degradation, ductilities attained, and energy absorption capacity. In the walls coupled by conventionally reinforced coupling beams, the sliding shear failure of the beams limits the energy absorption capacity of the structure. In every respect the superior performance of the structure containing diagonally reinforced beams is established. The use of ductile diagonally reinforced coupling beams enabled a considerable portion of the total energy to be dissipated by the coupling system thereby relieving plastic hinges in the walls. The results show that with careful detailing, coupled shear wall structures can be made to possess all the desirable features of an effective earthquake-resistant structure.