The Bear Mountain Bridge crosses the Hudson River about 40 miles north of Manhattan (see Fig. 1). At the time of its construction in 1924, it was the longest suspension bridge in the world for 19 months, until it was eclipsed by the Benjamin Franklin Bridge in Philadelphia. The Bear Mountain Bridge is a classical suspension bridge with an overall length of 2,255 feet between anchorages, a main suspended span of 1,632 feet and simply-supported side truss spans of 210 feet each. The main cable was spun in 1924 and carries a working load of approximately 14,000 kips each. Four concrete-filled rock tunnels, 82 ft to 119 ft long, provide anchorages for the main cable. Through inspection and acoustic monitoring, stress corrosion cracking was detected in the main cable. During initial rehabilitation work on the southwest backstay, further evidence of wire slippage and elongation was detected in the splay chamber. The discovery of movement in the southern backstay prompted action to relieve the load in the southwest backstay.
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机译：熊山大桥越过哈德逊河，距曼哈顿以北约40英里（见图1）。 1924年建造之时，它是世界上最长的悬索桥，历时19个月，直到费城的本杰明·富兰克林桥（Benjamin Franklin Bridge）使其黯然失色。熊山大桥是一座经典的悬索桥，锚点之间的总长度为2255英尺，主悬索跨度为1,632英尺，而简单支撑的侧桁架跨度均为210英尺。主电缆于1924年开始旋转，每根电缆的工作负载约为14,000 kips。四个混凝土填充的岩石隧道长82英尺至119英尺，可为主电缆提供锚固。通过检查和声学监测，在主电缆中检测到应力腐蚀开裂。在西南后院的最初修复工作中，在八字室中发现了进一步的丝滑和伸长迹象。南部后方支柱的运动发现促使人们采取了缓解西南后方支柱工作的行动。
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