Based on four-year field inspection and investigation on deck pavement of mastic asphalt on Jiangyin Bridge, cracking causes of mastic asphalt are studied. Cracks of deck pavement are summarized on crack length and wi...Based on four-year field inspection and investigation on deck pavement of mastic asphalt on Jiangyin Bridge, cracking causes of mastic asphalt are studied. Cracks of deck pavement are summarized on crack length and width to get a clear view of their propagations. Traffic surveys including traffic volume, axle load and vehicle speed were also conducted to assess their influences. Samples taken on-site were tested with pulling-out test and fatigue test to benchmark their properties. According to the inspection and tests results, it is concluded that the cracks are induced by rutting and fatigue. Lack of fatigue resistance, not well bonded to the steel deck and insufficient high temperature stability are supposed to be the main reasons as well as high density of low speed, excessively overloaded trucks.展开更多
桥钢厚板焊接常采用多层焊,由于焊接过程中焊缝区热应力作用和金属复杂相变过程,在厚度方向上产生了变化较大的焊接残余应力。目前,桥钢厚板内部残余应力的测量暂无统一方法,数值模拟分析也存在诸多困难。采用逐层铣削法对厚度为45 m m...桥钢厚板焊接常采用多层焊,由于焊接过程中焊缝区热应力作用和金属复杂相变过程,在厚度方向上产生了变化较大的焊接残余应力。目前,桥钢厚板内部残余应力的测量暂无统一方法,数值模拟分析也存在诸多困难。采用逐层铣削法对厚度为45 m m的对接焊钢板焊缝区沿焊缝方向的残余应力进行了测量,得到其沿焊缝厚度方向的具体分布情况。测量结果可为钢桥焊接残余应力数值模拟和钢桥疲劳研究提供参考。展开更多
文摘Based on four-year field inspection and investigation on deck pavement of mastic asphalt on Jiangyin Bridge, cracking causes of mastic asphalt are studied. Cracks of deck pavement are summarized on crack length and width to get a clear view of their propagations. Traffic surveys including traffic volume, axle load and vehicle speed were also conducted to assess their influences. Samples taken on-site were tested with pulling-out test and fatigue test to benchmark their properties. According to the inspection and tests results, it is concluded that the cracks are induced by rutting and fatigue. Lack of fatigue resistance, not well bonded to the steel deck and insufficient high temperature stability are supposed to be the main reasons as well as high density of low speed, excessively overloaded trucks.
文摘桥钢厚板焊接常采用多层焊,由于焊接过程中焊缝区热应力作用和金属复杂相变过程,在厚度方向上产生了变化较大的焊接残余应力。目前,桥钢厚板内部残余应力的测量暂无统一方法,数值模拟分析也存在诸多困难。采用逐层铣削法对厚度为45 m m的对接焊钢板焊缝区沿焊缝方向的残余应力进行了测量,得到其沿焊缝厚度方向的具体分布情况。测量结果可为钢桥焊接残余应力数值模拟和钢桥疲劳研究提供参考。
