Layerwise theory-based finite elements for static and dynamic analysis of CLT-concrete composites with partial shear connection

The paper presents a formulation of layered finite elements (based on Reddy's full-layerwise-theory) for static and dynamic analysis of cross-laminated-timber concrete composites (CCC). A partial interaction between concrete and cross-laminated-timber (CLT), allowing for interlayer slip, is incorporated by using distributed elastic springs in the CLT-concrete interface. A linear discontinuous layer-wise interpolation of displacement components through the thickness is imposed to account for complex layerwise kinematics including partial shear connection. The model is implemented using the original MATLAB framework, while the graphical user interface is developed in GiD environment. It is validated against the available data in the literature, and excellent agreement for static and dynamic simulations is obtained with computational cost savings. The complex 3D displacement/strain/stress fields and natural frequencies of the CCC with various interlayer slip moduli are accurately predicted. The parametric study on the influence of partial shear connection on stress distribution within the CCC is provided as a benchmark for future investigations. The developed model can be applied for the analysis of timber-concrete (TCC) or other plate-like layered composites with partial shear connection and arbitrary geometry.