Seismic Resistant Cross Laminated Timber (Clt) Structures With Innovative Resilient Slip Friction (Rsf) Joints

Abstract eng:
Multi-story timber structures are becoming progressively desirable for engineers and building owners owing to their aesthetic and environmental benefits and to their higher strength to weight ratio compared to other construction materials. Moreover, there is an increasing public pressure to have low damage structural systems to minimize the earthquake destruction after moderate to severe seismic events. This is important as the building could be reoccupied quickly with minimal business interruption and repair costs. A recent trend in timber building industry is toward cross laminated timber (CLT) panelised structures. CLT is a relatively novel engineered wood based product well suited for multi-story structures. Due to the precise prefabrication and easy installation of CLT panels, there is an increasing trend towards construction of timber panelised structures using them. Latest research findings have shown that CLT buildings constructed with traditional methods can experience high damages especially at the connections which generally consist of hold-down brackets and shear connectors with nails, screws, rivets or bolts. Several research studies have proven that friction joints can provide a perfectly elastoplastic behaviour alongside a stable hysteretic response under severe seismic excitations. Up until now, the main disadvantage of the frictions joints has been the undesirable residual displacements after a seismic event. The main objective of this study is to develop a ductile low-damage structural system for multi-story residential and commercial timber buildings using the innovative Resilient Slip Friction (RSF) joint. The proposed system includes resilient coupled walls and end column as the main lateral load resisting members. RSF joints are used as hold-down connectors which connects the wall to the foundation and also as ductile links between the adjacent walls or between the walls and steel end columns. The ductility and resilience of such system is provided by the RSF joints. A series of joint component test has been conducted to experimentally evaluate the hysteretic behaviour of the RSF joints. The test results demonstrated a stable flag-shaped hysteresis which readily exhibits the self-centring behaviour and also a significant rate of energy dissipation representing the damping capacity of the joint. The Damper – Friction Spring Link element function in SAP2000 was used and proved to be able to accurately represent the load-deformation behaviour of a RSF joint. Additionally, displacement-control cyclic analyses of CLT coupled walls with RSF joints showed that this innovative system definitely has the potential to be recognized as an efficient resilient structural systems for timber construction which could be extended to steel and reinforced concrete buildings as well.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket