A rigid hanger connecting structure and a bridge structure. The connecting structure includes a rigid hanger and further includes a first connecting portion connected to a top end of the rigid hanger and a second connecting portion connected to a bottom end of the rigid hanger, and the hanger is connected to the first connecting portion and/or the second connecting portion by using a spherical bearing pair. A rotatable connection between the hanger and a bridge structure is implemented to avoid cracking of concrete inside a short hanger, prolonging the service life of a bridge; the connecting ends of the hanger are located within a line of sight range convenient for maintenance, to eliminate a blind zone, improving bridge safety; the hanger can be prefabricated in a factory, shortening construction period and improving efficiency.

A damping assembly for a structure includes a housing with a first fixed end and a second movable opposite end. A first translatable portion of the housing is slidably movable relative to an adjacent second section of the housing, the former being fixedly secured to a base when the structure is under load. A viscous damper disposed within the housing is engaged only after the first translatable section has first moved beyond an initial predetermined distance indicative of a higher amplitude loading event. At least one biasing feature prevents the viscous damper from operating until the first translatable section has first moved beyond the initial predetermined distance.

A damping assembly for a structure includes a housing with a first fixed end and a second movable opposite end. A first translatable portion of the housing is slidably movable relative to an adjacent second section of the housing, the former being fixedly secured to a base when the structure is under load. A viscous damper disposed within the housing is engaged only after the first translatable section has first moved beyond an initial predetermined distance indicative of a higher amplitude loading event. At least one biasing feature prevents the viscous damper from operating until the first translatable section has first moved beyond the initial predetermined distance.

A joint for a support structure comprises a first beam having a first channel defined therein and a second beam inserted through the first channel of the first beam. The exterior surfaces of the second beam are connected to edges of the first channel.

A joint for a support structure comprises a first beam having a first channel defined therein and a second beam inserted through the first channel of the first beam. The exterior surfaces of the second beam are connected to edges of the first channel.

Disclosed herein are a method and program for calculating the stiffness coefficient of a bridge by using a finite element model. The method of calculating the stiffness coefficient of a bridge by using a finite element model includes: step (a) of receiving the information of a bridge in an ambient vibration test via a simulator for a finite element model; step (b) of calculating relative girder displacements (RGDs) by converting the deflection displacements of the bridge into proportions; and step (c) of calculating the stiffness coefficient k of the bridge from the error function of the bridge using the relative girder displacements (RGDs) as a variable by taking into account the deflection shape of the bridge in the relative girder displacements (RGDs) calculated at step (b). In this case, the stiffness coefficient k of the bridge is calculated using ambient vibration test data.

Disclosed herein are a method and program for calculating the stiffness coefficient of a bridge by using a finite element model. The method of calculating the stiffness coefficient of a bridge by using a finite element model includes: step (a) of receiving the information of a bridge in an ambient vibration test via a simulator for a finite element model; step (b) of calculating relative girder displacements (RGDs) by converting the deflection displacements of the bridge into proportions; and step (c) of calculating the stiffness coefficient k of the bridge from the error function of the bridge using the relative girder displacements (RGDs) as a variable by taking into account the deflection shape of the bridge in the relative girder displacements (RGDs) calculated at step (b). In this case, the stiffness coefficient k of the bridge is calculated using ambient vibration test data.

A gangway comprising a fixed platform. A support structure is connected to the fixed platform in a manner that allows the support structure to rotate with respect to the fixed platform. A releasable position locking assembly that inhibits rotation of the support structure in a raising direction is also provided. The releasable locking assembly includes a closed-loop fluid arrangement.

A gangway comprising a fixed platform. A support structure is connected to the fixed platform in a manner that allows the support structure to rotate with respect to the fixed platform. A releasable position locking assembly that inhibits rotation of the support structure in a raising direction is also provided. The releasable locking assembly includes a closed-loop fluid arrangement.

The present invention relates to a multipurpose viscous damper (100), comprising: an outer cylinder (101); a core rod (102) positioned in the outer cylinder (101); a core piston (103) positioned in the middle and surrounded the core rod (102); a plurality of bypass pipes (104) extending along the outer cylinder (101), each bypass pipe (104) being connected to the outer cylinder (101) adjacent to the two ends of the outer cylinder (101); an orifice controller (105) located on the bypass pipes (104) for providing initial adjustable damping during low to moderate vibration; and characterized by a pair of inner cylinders (106) positioned inside the two ends of the core rod (102); an inner piston (107) positioned in each inner cylinder (106); a fixed sealing (108) located at the two end of each of the inner cylinders (106); and an orifice (109) located at the two ends of the inner cylinder (106) for allowing fluid flowing from the inner cylinder (106) to the outer cylinder (101) during movement of inner piston (107).