Abstract: The present invention provides a semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridges. It has the advantages and characteristics that: (1) springs are horizontally placed at the bottom of a beam, and lengths are not limited, so that the frequency requirement of a low-frequency target can be satisfied; (2) different target frequencies can be realized through different combinations of a plurality of springs connected in series and in parallel, so that multi-order vortex-induced vibration control needs are satisfied; (3) the springs made of fiber reinforced nylon materials are adopted, and are notched, so that a frequency implementation range can be greatly widened; (4) the material and the form of a mass body are not limited, and a water bag can be used, which has low cost and is convenient for disassembly, assembly and mass adjustment.

Abstract: An apparatus for mounting a closure on a housing or the like, the apparatus having two arm members mounting the closure on the housing and each having a camming surface and a guide channel individually engaging a pivot pin and guide pin respectively borne by the housing and mounting the closure for movement between a recessed closed position and a recessed opened position relative to the housing. A confining assembly including a plurality of the housings aligned in a substantially horizontal row and having a single substantially flat panel extending beneath a plurality of the housings to serve as a floor therefor.