Fixed it - Import export

SR series mechanical fuse restraint devices prevent relative movements between connected parts until reaching a force threshold. Upon exceeding such force, thanks to the break of a sacrificial element, they permit said movements. They are used to exclude the seismic protection system under operating conditions, allowing for free operation during design earthquake. Experimental force-displacement curve of a mechanical fuse restraint device. SR devices coupled with a bearing (Krka Bridge, Croatia). A device of the SR series installed together with fluid viscous dampers in Rion Antirion Bridge (Greece).

Guides are mechanical devices which permit sliding in one direction of the horizontal plane, transferring force in the orthogonal direction. Restraints are fixed mechanical devices which block displacements along a plane transferring horizontal force in every direction. Neither ones transfer vertical loads. Experimental force-displacement curve of a GU series guide. A guide for the bridges of the Panagia Grevena Section (Greece). A restraint for flyover 1.1 of the Caracas - Tuy Medio Railway (Venezuela).

Shock transmitters create a very stiff restraint against a dynamic action, while permitting the slow movements of structures, for example those produced by thermal changes without opposing significant resistance. They are used when the structural behaviour should be different for service actions and seismic or dynamic actions. Experimental force-displacement curve of a shock transmitter obtained during high-speed testing. Preparation of tests on a shock transmitter for the Storebælt Bridge (Denmark). Installation of shock transmitters on the Stonecutters Bridge (Hong Kong, China).

This bearing consists of: a lower part (base) of steel in which a cylindrical case is obtained to house the rubber disc (elastomeric bearing); a rubber disc housed inside the base; an upper part (piston) that is inserted in the case of the lower part.