Seismic behavior of coupled shear wall structures with various concrete and steel coupling beams

Abstract

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

Experimental Comparison Study on Cyclic Behavior of Coupled Shear Walls with Two-Level-Yielding Steel Coupling Beam and RC Coupling Beam

“…Li et al made a series of seismic performance comparisons of coupled shear walls with various coupling beams through numerical analysis. It was found steel coupling beams (SCBs or TYSCBs) could largely improve the energydissipation ability of coupled shear wall systems [7]. However, the corresponding experimental verification study is relatively deficient.…”

Seismic design and engineering practice of 10‐story shear wall structure with replaceable viscoelastic coupling beams

“…[ 6 ] To enhance the seismic performances of reinforced concrete coupling beams, researchers have proposed various strategies, such as the diagonal reinforcement detailing, the rhombic reinforcement detailing, the steel coupling beam, and the hybrid steel–concrete coupling beam. [ 7–10 ] These strategies were found to be effective in improving the seismic performances of coupled shear wall structures in some degree. However, once the couplings beams are damaged in large earthquakes, repairing or replacing them are expensive and time consuming.…”

Analysis of Vertically Oriented Coupled Shear Wall Interconnected with Coupling Beams

“…To analyse the behaviour of the coupled wall system [11][12][13][14][15], some experimental as well as analytical research has been performed. However, experiments on RC coupled walls are very minimal compared to various studies on independent planar shear walls [16][17][18][19][20] and coupling beams [21][22][23][24][25][26][27].…”