Abstract
Based on the advantages of modular prefabricated multistory steel structure, a full‐bolt‐connected modular steel coupling beam‐hybrid coupled wall system is presented. Further, a method of estimating the coupling ratio (CR) is proposed according to the continuous link method. A CR‐based seismic design procedure is determined such that the structure utilizes the lateral stiffness of the shear wall, which is necessary to avoid structural damage under frequently occurring earthquakes. However, it also exhibits excellent ductility of the coupling beams, which is necessary for dissipating energy under infrequent earthquakes. Subsequently, nonlinear hysteretic analyses are conducted from finite element analysis software ABAQUS, and a parametric study based on the finite element technique is performed to identify the optimal value of the coupling ratio. Results indicate that the seismic performance of modular prefabricated HCWs was excellent, and the basic requirements for ductile behavior and lateral stiffness were satisfied for CR values from 50% to 60%. The obtained results confirm the accuracy of the CR‐based seismic design method proposed in this study and are supported by the selection of the design parameter at the initial design stage.
Highlights
Reinforced concrete (RC) walls are an important lateral force-resisting component, even if they might suffer from unexpected shear failure under earthquakes [1]
Steelreinforced concrete (SRC) shear walls with steel boundary elements were used to improve the seismic performance of shear walls, which is a typical structure used in high-rise and super high-rise buildings
Some experimental investigations indicated that field-welding quality is difficult to control in key parts of the connection, and unexpected brittle failure has often been observed between the weld metal and base metal at the toe of the weld access holes [8, 9]. erefore, to improve the assemblability of SRC shear walls with steel boundary elements and steel coupling beams, referring to the advantages of modular prefabricated multistory steel structures [10,11,12,13,14,15,16,17], an innovative modular prefabricated hybrid coupled wall (HCW) system is presented in this study. is modular prefabricated HCW system is composed of two SRC walls with steel boundary elements coupled using a full-bolt-connected modular steel coupling beam, and the modules can be assembled rapidly without
Summary
Reinforced concrete (RC) walls are an important lateral force-resisting component, even if they might suffer from unexpected shear failure under earthquakes [1]. Owing to functional requirements and architectural design needs, when forming a coupled wall system using conventional RC coupling beams, two types of problems have been exhibited: first, a distinct brittle shear failure often occurs in the RC coupling beams because of the relative smaller spanheight ratio; second, conventional RC coupling beams suffer from being difficult to connect with steel boundary elements when under construction and are difficult to repair after seismic damage. Erefore, to improve the assemblability of SRC shear walls with steel boundary elements and steel coupling beams, referring to the advantages of modular prefabricated multistory steel structures [10,11,12,13,14,15,16,17], an innovative modular prefabricated HCW system is presented in this study. Based on the results of this new design method, the seismic performance of models with di erent CRs is analyzed under hysteretic pushover analyses to determine a suitable value for the coupling ratio
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