Parametric study on lateral behaviour of composite shear walls with high-strength manufactured sand concrete

• Published in: Structures (Oxford) Vol. 49; pp. 332 - 344
• Main Authors: Guan, Minsheng, Wang, Xin, Heng, Junlin, Sha, Meng, Du, Hongbiao
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2023
• Subjects: Composite shear wall; High-rise building; High-strength concrete; Lateral behaviour; Manufactured sand; Numerical simulation; Parametric investigation; High-rise building; High-strength concrete; Numerical simulation; Composite shear wall; Manufactured sand; Lateral behaviour; Parametric investigation
• ISSN: 2352-0124; 2352-0124
• DOI: 10.1016/j.istruc.2023.01.107

The traditional reinforced concrete (RC) shear wall showed limited seismic performance under extreme earthquakes when deployed at the bottom of high-rise buildings, due to the presence of high axial compression ratios. In this study, a novel composite shear wall was proposed to improve the seismic performance at high axial compression ratios, in accordance with recent demands for eco-friendly materials. The novel composite wall integrated the high-strength manufactured sand (MS) concrete, ring-stirrup and steel tube to fully maximize material efficiency and achieve inter-enhancement. A quasi-static test was at first carried out on the proposed composite shear wall, which validated the expected enhancement on its lateral mechanical behaviour preliminarily. On this basis, a refined finite element (FE) model was established for the test specimen by considering the nonlinearity and cyclic behaviour of materials, in order to provide further insights into its behaviour under lateral loads. The established FE model was verified against the test data, which showed a good agreement between the numerical prediction and the test result. Meanwhile, a list of key parameters was identified according to their influence on the lateral behaviour of the composite wall, including the axial compression ratio, yield strength of steel tubes, compressive strength of concretes, reinforcement ratio in concrete-filled steel tube (CFST) columns, and space between ring-stirrups. On this basis, a series of parametric investigations were carried out with the validated FE model, by varying the selected key parameters. In general, the research output offered a constructive guideline and data support for the expected engineering application of the proposed composite shear wall.