A Preloaded Spring Damper (PSD) is a unit designed to dissipate seismic energy on structures such as bridges. The PSD reduces longitudinal and transverse displacement of the deck. JARRET can provide two types of PSDs: working in tension/compression, or acting only in compression.
JARRET can install the PSD compression type longitudinaly between the deck and the abutment, or install a PSD tension/compression unit in transverse between the deck and the pier structure. The Preloaded Spring Damper (PSD) - Jarret acts as a shear key which has the possibility to regenerate itself automatically after a dynamic event. The seismic energy is dissipated in the PSD unit instead of being dissipated in a steel or concrete structure.
JARRET can accommodate transverse and longitudinal seismic displacement, and at the same time take into account longitudinal displacement such as creep shrinkage and thermal expansion or contraction.
Spiers Engineering Pty. Ltd. is a full service CNC machine shop specializing in repairs, modification, quantity production, prototypes and R&D projects. Servicing a wide spectrum of Industries from small local manufacturers to large Fortune 500 Companies and Defence Industries, each job and customer is treated with individual dedication.
Whether it is a basic component or a complex design incorporating a large number of processes, the Spiers Engineering group has the know-how to tackle the most demanding precision component manufacturing tasks.
Spiers Engineering is a full service machine shop specialising in the following areas;
Custom-designed manufacturing service
Research and Development Projects