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首页> 外文期刊>Transportation Research Record >Field Monitoring of Integral Abutment Bridge in Massachusetts
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Field Monitoring of Integral Abutment Bridge in Massachusetts

机译：马萨诸塞州整体桥台的现场监控

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摘要

Integral abutment bridges are increasingly being used to eliminate undesirable bridge joint effects on the long-term performance of bridges. Although many states use this type of construction, common design guidelines are lacking, and nonuniform limitations on integral abutment design are imposed by different agencies. Data from the field monitoring of an existing three-span integral abutment bridge in central Massachusetts are presented. Resulting data are valuable in evaluating existing design provisions and understanding structural behavior. The results presented for a 16-month period of monitoring include recorded ambient temperature from -4℉ to 99℉ (-20℃ to 37℃). Longitudinal movements induced by thermal expansion and contraction of the bridge are consistent with temperature changes. However, earth pressure cell data indicate that the maximum pressures generated behind the abutment walls occur in early spring. Lower pressures measured in the summer indicate some dissipation of soil pressures with time. Longitudinal displacement measurements taken during 2-week periods included variations that approached the magnitude of seasonal changes. Although fairly significant abutment movement has been recorded to date, there is no clear indication that the abutment piles have yielded. Field monitoring will continue, and the results from this study will be used to calibrate a detailed finite element model of the bridge to validate current integral abutment bridge design practices.
机译：越来越多地使用一体式桥台来消除对桥的长期性能的不良桥连接影响。尽管许多州都使用这种类型的结构，但缺乏通用的设计准则，并且由不同机构对整体式基台设计施加了不统一的限制。提供了马萨诸塞州中部一个现有的三跨整体式桥台的现场监测数据。结果数据对于评估现有的设计规定和理解结构行为非常有价值。在为期16个月的监测期间得出的结果包括记录的环境温度为-4℉至99℉（-20℃至37℃）。由桥的热膨胀和收缩引起的纵向运动与温度变化一致。但是，土压力单元数据表明，在基台壁后产生的最大压力发生在早春。夏季测得的较低压力表明土壤压力会随时间消散。在2周内进行的纵向位移测量包括接近季节性变化幅度的变化。尽管迄今为止已经记录了相当大的基台运动，但是没有明确的迹象表明基台桩已经屈服。现场监测将继续进行，这项研究的结果将用于校准桥梁的详细有限元模型，以验证当前的整体式桥台桥梁设计实践。

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