![]() The collapse of the Mianus River Bridge in Connecticut exposed potential flaws with pin and hanger bridges that could lead to catastrophic failures, if left unchecked. Pin and hanger assemblies are considered fracture critical bridge components, meaning that the assemblies are non-redundant and failure of these systems could cause part or all of the bridge to collapse. Exceptionally long spans may have two sets of girders cantilevered from opposite bridge piers with a third set of girders suspended by pin and hanger assemblies from both cantilevers. Large washers are bolted to each end of the pin to retain the hangers. A pair of large steel pins through the plates and girder webbing provide the hinges, holding up the suspended span while allowing it to move longitudinally. The two holes are connected using hangers, a pair of connecting plates sandwiching the bridge girders. The beams have holes directly above each other. The other (the suspended span) begins underneath the anchor span, and has its far end resting on the next pier. One beam (the anchor span) is set on a pier with a short section cantilevered out toward the next pier. These assemblies are used to provide an expansion joint in the bridge.
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