Damage in recent major earthquakes has resulted in engineers' effort on the development of techniques which not only provide life-safety, but also aim to minimise damage so that buildings could be reoccupied quickly with minimal business interruption and repair costs. In this paper, the new developments on the innovative Resilient Slip Friction Joint (RSFJ) technology are introduced which provide an advanced engineering solution for seismic damage avoidance design of structures. Given the significance of the deformation compatibility in the connections of rocking structures to fully satisfy the low-damage design concept, the performance of the RSFJ under in-and out-of-plane rotations has been investigated analytically and experimentally. The results demonstrate the RSFJ rotational flexibility in addition to the main translational deformability, owing to the discs springs providing the chance for the separation and prying of the RSFJ clamped plates without losing the joint integrity. The comparison between the predictions and the test results verifies the accuracy of the model developed. Also, different applications of the RSFJ technology have been presented adoptable for new structures as well as retrofitting of earthquake-prone buildings.
New Zealand Society for Earthquake Engineering Conference
Research Status
Complete
Notes
April 27-29, 2017, Wellington, New Zealand
Summary
Multi-storey timber structures are becoming progressively desirable owing to their aesthetic and environmental benefits and to the high strength to weight ratio of timber. A recent trend in timber building industry is toward cross laminated timber (CLT) panelized structures. The shake table tests within the SOFIE project have shown that the CLT buildings constructed with traditional methods can experience high damage especially at the connections which generally consist of hold-down brackets and shear connectors with mechanical fasteners such as nails or bolts. Thus, current construction methods are not recognised as reliable in seismic prone areas. The main objective of this project is to develop a new low damage structural concept using innovative resilient slip friction (RSF) damping devices. The component test results demonstrate the capacity of this novel joint for dissipating earthquake energy as well as self-centring to minimize the damage and the residual drift after a severe event. The application of RSF joints as holddown connectors for walls were investigated through numerical studies. Moreover, a core wall system comprised of cross laminated timber and RSF connectors is subjected to time-history earthquake simulations. The numerical results exhibit no residual displacement alongside a significant reduction in peak acceleration which can be attributed to significant amount of dissipated seismic energy over the RSF joints within the system.
New Zealand Society for Earthquake Engineering Conference
Research Status
Complete
Notes
April 27-29, 2017, Wellington, New Zealand
Summary
There is an increasing public pressure to have damage avoidant structural systems in order to minimize the destruction after severe earthquakes with no post-event maintenance. This study presents and investigates a hybrid steel-timber damage avoidant Lateral Load Resisting System (LLRS) using Cross Laminated Timber (CLT) walls coupled with innovative Resilient Slip Friction (RSF) joints and boundary steel columns. RSF joints are used as ductile links between the adjacent walls or between the walls and the columns. These joints are capable to provide a self-centring behaviour (the main deficiency of conventional friction joints) in addition to a high rate of energy dissipation all in one compact device. One significant advantage of this system is that there are practically no bending stresses in the CLT panels which considerably increases the allowable capacity of the system. A numerical model for a four story prototype building containing the proposed concept is developed and subjected to time-history simulations. The results confirm that this system can be considered as the new generation of resilient LLRSs for different types of structures.
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