A novel 2-level yielding steel coupling beam (TYSCB) has been developed to enhance the seismic performance of coupled shear wall systems. The TYSCB consists of a shear-yielding beam designed to yield first under minor earthquakes and a bend-yielding beam designed to yield under severe earthquakes. A comparison of seismic behavior of 4 20-storey coupled shear wall structures with reinforced concrete coupling beams, complete steel coupling beams, fuse steel coupling beams, and TYSCB is presented. The dimensions and force-displacement curves of these coupling beams are first designed. Nonlinear dynamic analyses on these structures are carried out under minor and severe earthquakes. The seismic behavior of these models is studied by comparing their storey shear forces, storey drift ratios and ductility demands. The results show that the base shear and storey drift of the structure with TYSCB under both minor and severe earthquakes are less than those of structures with concrete coupling beams and complete steel coupling beams. Furthermore, the ductility demand of coupled shear walls with TYSCB subjected to severe earthquakes can be greatly released compared with those using fuse steel coupling beams. This indicates that the proposed TYSCB has a better balance between ductility demand and energy dissipation, compared to traditional steel coupling beams.
KEYWORDSconcrete coupling beam, coupled shear wall, energy dissipation capacity, seismic behavior, steel coupling beam, two-level yielding steel coupling beam
Summary
This paper aims to investigate the seismic performance improvement effect of coupled shear wall with steel link beams under cyclic lateral loading. The quasi‐static tests on two 1/3‐scaled specimens, including one coupled shear wall with steel link beams and one coupled shear wall with conventional concrete link beams, were conducted. These two specimens were designed with similar lateral initial stiffness and tested under the same gravity and lateral cyclic loading procedure. The specimen with concrete link beams exhibited sequence shear failures of link beams from top to bottom storey after completing 22 loading cycles. However, the specimen with steel link beams sustained ductile and plump hysteretic behavior under the same loading cycles. The lateral load‐resisting capacity of the specimen with steel link beams is 2.2 times of the specimen with concrete link beams. The experimental results demonstrated great advantages of steel link beams in improving seismic performance of conventional coupled shear wall systems.
Shear wall structures have been widely used in high-rise buildings during the past decades, mainly due to their good overall performance, large lateral stiffness, and high load-carrying capacity. However, traditional reinforced concrete wall structures are prone to brittle failure under seismic actions. In order to improve the seismic behavior of traditional shear walls, this paper presents three different metal energy-dissipation shear wall systems, including coupled shear wall with energy-dissipating steel link beams, frame with buckling-restrained steel plate shear wall structure, and coupled shear wall with buckling-restrained steel plate shear wall. Constructional details, experimental studies, and calculation analyses are also introduced in this paper.Keywords: shear wall; energy-dissipation; coupled shear wall with energy-dissipating steel link beam; frame with bucklingrestrained steel plate shear wall structure; coupled shear wall with buckling-restrained steel link plate
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