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Zhang Y.-F.,Jiangsu Transportation Research Institute | Zhang Y.-F.,Laboratory for Health Inspection and Diagnosis Technology of Long Span and Large Bridges of Ministry of Transport | Chen X.-F.,Jiangsu Yangtze River Bridge Co. | Zhang L.-T.,Jiangsu Transportation Research Institute | And 3 more authors.
Bridge Construction | Year: 2013

To timely find out the damage of expansion joints in long span suspension bridges and to analyze the main causes leading to the damage, the expansion joints of two long span suspension bridges of Jiangyin Changjiang River Highway Bridge and the South Bridge of Runyang Changjiang River Highway Bridge were cited as the examples. Based on the general method for condition evaluation of the large movement expansion joints of the measurements from the structural health monitoring system, the condition analysis of the expansion joints of the suspension bridges was made, the movement characteristics of the expansion joints of the two suspension bridges and a cable-stayed bridges were compared and accordingly the handling measures for the damage to the expansion joints were put forward. In accordance with the analysis, it was considered that the longitudinal displacement characteristics of the suspension bridges and cable-stayed bridge had distinctive differences and it was concluded that the excessive cumulative longitudinal displacement and the great passing vehicle impact were the main causes leading to the damage to the expansion joints of the suspension bridges. The measures of replacing with the sliding block material with better abrasion performance, adding the movement constraint device and installing the longitudinal dampers on the girders might be taken to improve the service performance and life of the expansion joints. These measures were eventually successfully taken for the expansion joints in the two example suspension bridges mentioned above and sound effect of the measures was achieved.

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