Beam Collapse-resistant Device
In the field of bridge seismic isolation, lateral limit blocks or longitudinal limits are usually utilized to prevent the girder from falling or disengaging from pier, which will be easily damaged however in areas with high intensity earthquake. In order to reduce casualties and losses, a longitudinal beam collapse-resistant device is set up between beam and pier to prevent the limit facilities from failure and the beam falling after exceeding its maximum allowable displacement. Beam collapse-resistant device is installed with one end fixed to the beam body at the bottom and the other end to lateral side of pier, which can be freely expanded along longitudinal direction of bridge and rotated along transversal direction of bridge. In case of failure of limit facilities due to earthquake or hurricane, the moment beam reaches the limit position, the chain of collapse-resistant device is tensioned to lock beam.