期刊
ENGINEERING STRUCTURES
卷 220, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2020.110994
关键词
High-strength steel rebars; Steel fiber reinforced high-strength concrete; Concrete-encased concrete filled steel tube (CFST) columns; Composite shear wall; Seismic performance; Reparability
资金
- Science and Technology Key Project of Beijing Municipal Education Commission [KZ201710005003]
- National Key Research and Development Program of China [2016YFC0701104]
An innovative shear wall was proposed, which was composed of high-strength concrete and steel rebars, as well as concrete-encased CFST columns embedded at boundary elements. To study the cyclic and resilient behavior of the proposed wall, four walls with shear span ratios of 2.2 were designed and tested under quasi-static cyclic loads. The test parameters were the type of longitudinal bars at boundary elements, the presence of steel fibers, and the axial compression ratio. As test results showed, within the limit of axial compression ratio, the proposed shear walls had small residual deformation until a 2% loading drift ratio; after that, the hysteresis curve became full and the energy dissipation capacity increased, indicating the desirable collapse resistance. Specifically, the use of ultra-high strength longitudinal bars at boundary elements significantly decreased the residual de-formation and improved the reparability. In addition, steel fibers effectively enhanced the deformation capacity of the proposed walls. Finally, given the confined effects of CFST columns and stirrups on concrete, a prediction model for the lateral load-bearing capacity was established. The comparison between predicted and test results from this study and existing research verified the good accuracy of this model.
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