Determination of the seismic performance factors for post‐tensioned rocking timber wall systems

Abstract

Post-tensioned technologies for concrete seismic resistant buildings were first developed in the 1990s during the PREcast Seismic Structural Systems program. Among different solutions, the hybrid system proved to be the most resilient solution providing a combination of re-centering and energy dissipative contributions respectively by using post-tensioned tendons and mild steel reinforcement. The system, while providing significant strength and energy dissipation, reduces structural element damage and limits post-earthquake residual displacements. More recently, the technology was extended to laminated veneer lumber (LVL) structural members, and extensive experimental and numerical work was carried out and allowed the development of reliable analytical and numerical models as well as design guidelines. On the basis of the experimental and numerical outcomes, this paper presents the evaluation of the seismic performance factors for post-tensioned rocking LVL walls using the FEMA P-695 procedure. Several archetype buildings were designed considering different parameters such as the building and story height, the type of seismic resistant system, the magnitude of gravity loads and the seismic design category. Lumped plasticity models were developed for each index archetype to simulate the behavioral aspects and collapse mechanisms. Non-linear quasi-static analyses were carried out to evaluate the system over-strength factor; moreover, non-linear time history analyses were performed using the incremental dynamic analysis concept to assess the collapse of each building. From the results of quasi-static and dynamic analyses the response modification factor, R, system over-strength factor, Ω0, and deflection amplification factor, Cd, values of, respectively, 7, 3.5 and 7.5 are recommended. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd

Performance‐based design of tall‐coupled cross‐laminated timber wall building

“…[1,7] In light of its many advantages such as the potential for mass production, prefabrication, speed of construction, sustainability, enhanced fire performance, and dimensional stability, CLT has been widely used as a viable alternative for low-and mid-rise buildings. [2,[8][9][10] In combination with steel or concrete (hybrid systems) [11,12] and post-tensioning systems, [13,14] CLT buildings are shown to be a feasible solution for tall-timber structures in a high seismic zone. To provide a novel contribution to the developing body of knowledge in CLT construction, this study has proposed an innovative coupled wall (CW) structural system.…”

Seismic loss analysis of buildings with post-tensioned cross-laminated timber walls

“…For the ELF procedure, lateral seismic demands were estimated for both prototypes using the response spectrum parameters, S DS and S D1 , presented in Table 1. The seismic response coefficient (R) for PT CLT rocking walls was assumed to be 6, which was consistent with the work of Ganey et al (2017) and slightly lower than the value of 7 recommended by Sarti et al (2017) lumber (LVL) rocking walls. The design forces from the ELF procedure were used for initial wall design.…”

Behaviour of self-centring shear walls—A state of the art review

“…The self-centring concept for walls with single or multiple segments has also been developed and applied in rocking timber shear walls [44][45][46][47][48][49]. The shear walls were mainly made of laminated Veneer Lumber (LVL) or glulam timber as the primary lateral load resisting system [50].…”