Abstract
Several experiments are conducted to investigate the seismic behavior of composite shear walls because of their advantages compared to traditional reinforced concrete (RC) walls. However, the numerical studies are limited due to the complexities for the steel and concrete behaviors and their interaction. This paper presents a numerical study of composite shear walls with stiffened steel plates and infilled concrete (CWSC) using ABAQUS. The mechanical mechanisms of the web plate and concrete are studied. FE models are used to conduct parametric analysis to study the law of parameters on the seismic behaviour. The finite element (FE) model shows good agreement with the test results, including the hysteresis curves, failure phenomenon, ultimate strength, initial stiffness, and ductility. The web plate and concrete are the main components to resist lateral force. The web plate is found to contribute between 55% and 85% of the lateral force of wall. The corner of web plate mainly resists the vertical force, and the rest of web plate resists shear force. The concrete is separated into several columns by stiffened plates, each of which is independent and resisted vertical force. The wall thickness, steel ratio, and shear span ratio have the greatest influence on ultimate bearing capacity and elastic stiffness. The shear span ratio and axial compression ratio have the greatest influence on ductility. The test and analytical results are used to propose formulas to evaluate the ultimate strength capacity and stiffness of the composite shear wall under cyclic loading. The formulas could well predict the ultimate strength capacity reported in the literature.
Highlights
Steel–concrete composite shear walls are composed of web plates, stiffened plates, infilled concrete, and steel studs
Half models are adopted to simulate the test in the following finite element analysis
The wall thickness ranges from 600 mm to 1500 mm, the steel ratio ranges from 3.3% to 8.3%, the shear span ratio ranges from 0.3 to 1.5, the axial compression ratio ranges from 0.2 to 0.6, the axial compressive strength of the concrete ranges from 40 MPa to 100 MPa, the yield strength of the steel ranges from 235 MPa to
Summary
Steel–concrete composite shear walls are composed of web plates, stiffened plates, infilled concrete, and steel studs. Researchers have studied FE models and proposed design formulas for composite shear walls. The influence of distance-to-thickness ratios on the failure mode was studied, and a formula for the axial compression capacity of a composite shear wall was proposed. The ultimate bearing capacity and lateral stiffness of composite shear walls are important parameters of seismic performance. Most of the relevant researches are qualitative studies, and the influence of parameters on the ultimate bearing capacity and lateral stiffness are not quantitatively analysed. A comprehensive parametric study is carried out to investigate the influence of parameters, including wall thickness, steel thickness, and shear span ratio, on the seismic behaviour. Formulas are proposed to predict the ultimate strength capacity and stiffness of composite shear walls and are validated by tests and parametric analysis. The other forms of composite shear walls are fitted by the formulas
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