Models and design procedure for cross-laminated bamboo rocking walls

Abstract

To conduct a comprehensive parametric and limit state study of Cross-Laminated Bamboo (CLB) rocking walls, this study established a finite element model (FEM) and a modified analytical model (MAM) for rocking walls based on tests. The initial prestress, cross-sectional area of the posttensioned rebars, aspect ratio of the CLB wall, and friction force of conventional friction dampers (CFDs) were studied. Parametric analysis showed that the lateral capacity of the rocking wall increased with the initial prestress and cross-sectional area of the posttensioned rebars, while the cross-sectional area of the rebars also led to an increase in the stiffness. A CLB wall with a high aspect ratio has good ductility and low stiffness. The increase in CFD friction force was an effective method to enhance the energy dissipation capacity of the rocking wall. The MAM was proposed based on the limit states and considered the action of the CFDs in the initial stage while modifying the calculation method of shear deformation of the CLB wall. The MAM was verified by the test and FEM results. Design procedure was then developed to ensure the lateral capacity and stiffness of the rocking wall at the collapse prevention (CP) hazard level.