Popovski, Marjan

Sensitivity Analysis of In-Plane Stiffness of Clt Walls With Openings

Abstract eng:
Cross-laminated timber (CLT) is a relatively new product that is gaining popularity in residential and non-residential applications in the North American construction market. As an engineered wood product categorized as “mass timber”, CLT provides many benefits when compared to either light-fame wood construction or concrete and steel construction. The cross-lamination itself provides improved dimensional stability to the product that allows for prefabrication of long floor slabs and single storey walls. The good thermal insulation and a fairly good behaviour in case of fire are added benefits resulting from the massiveness of the wood structure. Furthermore, it is a clean product to work with resulting in much less waste and dust produced on site which is better in terms of health and safety. An accurate quantification of in-plane stiffness of the CLT panels and shearwalls is required to design a CLT structure subjected to lateral loads. Nevertheless, till today, no general approach is available for the design of CLT-members loaded in plane. In addition, there are no standardized methods for determining the stiffness of CLT shearwalls in the respective material design standards: the CSA O86 in Canada, and the NDS in the US. Therefore, the present study aims to quantify the stiffness of CLT walls under in-plane loading. A finite element analysis (FEA) model of CLT walls was developed in ANSYS. Wood was modelled using orthotropic elastic material, where the glue-line in between panels was modelled using non-linear contact element. The material properties were adopted from experiments. The FEA model was verified from test results of CLT panels under in-plane loading. The stiffness was calculated from the FEA and compared against existing analytical models. Results showed that the FE analyses were sufficiently accurate in predicting elastic stiffness of CLT panels. A parametric study was performed to evaluate the change in stiffness of CLT walls with the variation of opening size and shape. A simplified equation to predict the in-plane stiffness of CLT walls with openings was proposed. Subsequently, a sensitivity analysis was performed using Meta-model of Optimal Prognosis (MOP) to evaluate the contribution of each parameter on the model response.

Contributors:

Shahnewaz, Md

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.