Reinforced concrete shear walls play an important role in improving seismic performance of building structures. In this paper, a new type of RC shear wall with concealed bracing is proposed and investigated. Four 1:3 scale medium-height specimens were designed and a detailed experimental investigation carried out. The load-carrying capacity, stiffness, ductility, hysteretic behavior and energy dissipation of the shear wall are discussed. The failure mechanism was revealed by the experiments. It is found that in comparison with a normal shear wall, the seismic performance of a shear wall can be significantly improved by adding concealed bracing within the wall panel. Finally, a mechanical model of the shear wall is proposed and formulae for calculating load-carrying capacity developed. It is shown that the theoretical results agree well with those from experiments.
The RC short-pier shear wall structure is a new type of structural system in tall residential buildings. It has been applied in many buildings in China, but its seismic performance is worse than that of normal shear wall structures. Therefore, how to improve its seismic performance becomes a problem which has been paid much attention by engineers. In this paper, the seismic performance of short-pier shear walls with concealed bracing is investigated. An experimental study of four 1:3 scale coupled short-pier shear wall specimens has been carried out, two of which were normal coupled short-pier shear walls, and the other two coupled short-pier shear walls with concealed bracing. Based upon the experimental study, the effects of concealed bracing on the load-carrying capacity, stiffness, ductility, hysteretic behavior, energy dissipation and failure mechanism of shear wall are discussed. It is shown that the seismic performance of short-pier shear walls is greatly improved by concealed bracing. Finally, mechanical models for calculating the load-carrying capacity of the shear wall are proposed, and the theoretical results agree well with those from experiments.
Short pier RC shear wall structure with concealed bracings is put forward in this paper. Two 1/6 scale models of short pier RC shear wall structure with and without concealed bracings are tested on shaking table. Dynamic properties and responses of the two structures at different stages are studied, and the comparison of failure modes between the two models is also made. Results from the experiments indicate that at elastic stage, seismic performance of short pier shear wall structure with concealed bracing is similar to that of structure without concealed bracing. After concrete cracks appearing, the seismic performance of the former is much better than that of the latter. The displacement responses of the former are much smaller than that of the latter, and the cracks distribution areas in walls of the former is much wider than that of the latter. The energy dissipation capacity of the former is significantly improved compared with that of the latter. Nonlinear time history analysis is carried out and the calculating results agree well with the results from the experiments.
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