NUMERICAL PREDICTION METHOD FOR DRIVING-POINT MOBILITY OF CLT STRUCTURES

Recently, Cross-Laminated Timber (CLT) structures have gained popularity due to their environmental benefits. On the other hand, CLT structures have a similar acoustic problem with lightweight buildings that there can be a problem with heavy-weight floor impact sound. Therefore, the prediction model for the heavy-weight floor impact sound at the design stage is essential to obtain a comfortable living environment. To accurately predict the heavy-weight floor impact sound characteristics like driving-point mobility of floor slabs, accurate numerical modeling of floor vibration is of great importance. However, there are not many studies that use the finite element method (FEM) to predict or examine the driving-point mobility of CLT panels yet. Hence, this paper investigated the prediction method of the driving-point mobility of CLT panels using FEM. The simulation considered two types of modeling approaches: single-plate modeling with equivalent Young's modulus and multi-layered modeling with Japanese cedar Young's modulus. The validity of the proposed method using FE modeling was confirmed by comparison between the results of the calculation and measurement.