International Journal of Engineering and Applied Sciences (IJEAS) ISSN: 2394-3661, Volume-6, Issue-10, October 2019 34 www.ijeas.org Abstract— In this study, the seismic behaviour of the concrete shear wall considering the opening with different shapes and constant cross-section has been studied, and for this purpose, several shear walls are placed under the increasingly non-linear static analysis (Pushover). These case studies modelled in 3D Abaqus Software, and the results of the ductility coefficient, hardness, energy absorption, added resistance, the final shape, and the final resistance are compared to shear walls without opening. Index Terms— Concrete Shear Wall, Seismic Parameters, Nonlinear Static Analysis, Performance levels, Pushover Diagrams I. INTRODUCTION One of the earthquake-resistant systems is a concrete shear wall system that due to its good performance in past earthquakes has been of interest to the engineers. But some architectural limitations enforced computing engineers to insert openings in its walls. Especially, in tall trellises with concrete core, a good location around lift lobby is suitable to install the shear wall and connect them to each other perpendicularly to create the winged shear walls, but in order to embed the elevator door we had to create openings in a wall that this matter will affect the behavior of shear wall. Reinforcement ratio and the Percentage of the wall opening dimensions of the most important factors affecting the nonlinear behavior of reinforced concrete shear walls with openings. Also, in recent decades, the steel shear wall system as one of the resistant systems against lateral loads has been paid attention by the researchers. Architectural requirements and beautification or non-structural considerations such as through mechanical installations and systems designers need to design or use thinner steel sheet steel with low yield strength may not be available in the market and the creation of factors that are causing the steel shear walls. In previous studies, the coupled beams are used to model shear walls openings for computer modeling; this approximation, especially for low-level openings with a relatively large error, occurs in the structural response [1]. This research could probe to understand the seismic behavior of these structures under nonlinear load, also concerning the possibility of making different innovations in the building industry structures and the increasing need for such innovations as well as the lack of adequate information and analysis. In this regard, this study could identify further development of this type of structure in the construction industry. Hossein Alimohammadi, Ph.D. student, Civil, Construction and Environmental Engineering Department, Iowa State University, Iowa, USA, Mostafa Dalvi Esfahani, Master of Science, Civil engineering department, Azad university of Maragheh, East Azerbaijan, Iran, Mohammadali Lotfollahi Yaghin, Professor, Civil Engineering Department, Tabriz University, Tabriz, East Azerbaijan, Iran., The study assumes a non-linear loading and linear and nonlinear behavior of the structure as well as a variety of openings’ shapes down on the seismic behavior of shear wall structures have different effects (from flexibility, ultimate load, and stiffness and so on) [2]. II. . BASICS OF DESIGN THEORY BASED ON NONLINEAR METHOD AND STRUCTURAL PERFORMANCE A. Define some specifications seismic structures The behavior of structural members according to the curve of force-deformation under a controlled force or controlled deformation can be classified by force and are introduced based on three different behaviors including ductile, semi-ductile, and brittle behavior. Ductile behavior is a kind that its structure in that area is elastic, but brittle behavior is that structures are low with great difficulty and the distance between the stress and the yield [3]. Ductile structures where the gap between the end and yield stress is high and structures in the elastic area will continue to transport by a nonlinear behavior. Nonlinear deformation allows the structures less power compared to the linear elastic structure against earthquake, in Figure 1 pushover curve load-displacement curve is drawn to a structure. Pushover analysis is a non-linear static analysis of the structure under lateral loads increasing and determining diagrams of load-displacement shift with a curve of the structural capacity of the quantities of base shear and lateral displacement that is usually used a reference level point for drawing the graph. Comparing to dynamical analysis, this method includes some more approximations. The dynamical method can analyze various behavior of structures such under various kind of loading, such as earthquakes, wind or considering some accidental failures in structures such as progressive collapse [4]. However, pushover analysis also can provide reliable performance of the structure, [5]. For example, Mousavi et al. used this method to investigate the ductility of concrete frames reinforced with high resistant steel bars. Utilizing pushover analysis, they successfully showed that using non-standard high-strength steel rebar can reduce the ductility of the frames. In another research, they used pushover analysis to study the effect of geometric parameters on response reduction factor (R) of steel special truss moment frames (STMF), [6]. In this study the pushover curves are idealized to bilinear curves in a way that Mousavi et al. used in their research. The ductility coefficient (μ) is the structural capacity to withstand non-elastic and plastic deformations without collapsing structures. According to this description, it can be stated that the maximum displacement of non-linear structures (Δmax) to shift of yield point (Δy) is the coefficient of plasticity as shown in Eq 1. Effects of openings on the seismic behavior and performance level of concrete shear walls Hossein Alimohammadi, Mostafa Dalvi Esfahani, Mohammadali Lotfollahi Yaghin