Nie Jianguo

Nonlinear Finite-Element Analysis of Double-Skin Steel-Concrete Composite Shear Wall Structures

Shear wall structures have been widely used in high-rise buildings due to their good lateral resistant behavior. As a new type of shear wall structure, the double-skin steel-concrete composite shear wall has high loading capacity, superior ductility and good crack resistant behavior. The mechanical properties of the composite walls need to be further studied. Based on the general FE package MSC.Marc(2005r2), an elaborate finite element analysis of the double-skin steel-concrete composite shear wall is conducted to simulate the whole-process behavior of the shear wall. The load-displacement relationship is obtained, and the slippage characteristic of the steel plate-concrete interface is also intensively investigated through enforcing the spring elements at the interface. Finally, the influence of the axial compression ratio and the steel plate thickness is presented by a parametric analysis. The conclusions drawn from the analysis are that the maximum slippage of the shear wall occurs at the tension side of the wall bottom where the concrete cracks and the axial force-moment curve has a parabolic property. The relevant conclusions are useful for the routine design practice of tall buildings.

Analytical model for ultimate loading capacities of continuous composite slabs with profiled steel sheets

Composite slabs with profiled steel sheet are widely applied in practical structures now. Plenty of literatures can be available about simply supported composite slabs with single span. However, continuous slabs always exist in high-rise building structures. In order to obtain the ultimate loading capacity of continuous composite slabs, the full scale test on slab specimens with high cost need to be carried out. This paper presented an analytical model for calculating the ultimate loading capacity of continuous composite slabs. Only the small-scale slide block test needed to be carried out for determining some mechanical parameters, resulting in less cost, compared with the conventional m-k test method. Various load conditions and parameters were considered in the analytical model. The comparison between test results and predicted results showed that the proposed method had enough precision. Furthermore, the simplified method was also proposed for practical design.