Multidirectional Cyclic Lateral-Load Testing of Repaired Self-Centering Cross-Laminated Timber Shear Walls

This paper presents an experimental study on the multidirectional cyclic lateral-load response of repaired post-tensioned self-centering (SC) controlled-rocking cross-laminated timber (CLT) shear walls (SC-CLT walls). Three SC-CLT wall specimens were investigated: an initially undamaged SC-CLT wall with unreinforced wall panels, a repaired SC-CLT wall with steel-plate reinforcement, and a repaired SC-CLT wall with steel-plate reinforcement and steel bearing plates on the foundation. An evaluation of the experimental response of SC-CLT walls (with and without steel-plate reinforcement) under multidirectional cyclic lateral loading is presented, with emphasis on changes in lateral stiffness and strength caused by damage. Steel-plate wall panel reinforcement is investigated as a repair approach to restore the lateral stiffness and strength of damaged SC-CLT walls. Steel bearing plates are used to repair (or avoid) localized damage to a concrete foundation when a steel plate–reinforced SC-CLT wall rocks on the foundation. The damage mechanisms affecting the changes in lateral stiffness and strength of each SC-CLT wall specimen are discussed. Assessment of the experimental results demonstrate that these repair methods are effective in restoring the lateral stiffness and strength of a damaged SC-CLT wall.