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Instrumentation for load rating of bridges

机译：桥梁额定载荷的仪表

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摘要

Abstract: A large percentage of the nation's bridges are classified as structurally deficient or functionally obsolete. Many bridges are classified as such due to the bridge's load rating. However, the vast majority of bridges are not actually tested to determine their load capacity. In general, actually testing a structure to determine the load rating is time consuming and expensive. As a result only a low number of bridges can be tested. A main time consuming portion of the load test is the setup of conventional instrumentation to monitor the status of the bridge under test. Typically strain gages and LVDT (or similar) deflection transducers are used. Instrumentation which would allow rapid load testing of bridges is currently being developed and tested at the Federal Highway Administration. This instrumentation includes wireless data acquisition systems interfaced with clamp-on strain gages, which can be placed at a measurement location in a matter of minutes. Also, the instrumentation includes a remote laser- based deflection measurement system. The combination of the two types of instrumentation, wireless data acquisition and laser-based deflection measurements, has the potential to allow a greater number of structures to be load rated giving a more accurate picture of the health of the nation's bridges. !0
机译：摘要：该国大部分桥梁被归类为结构缺陷或功能已过时。由于桥梁的额定载荷，许多桥梁被归类为此类桥梁。但是，绝大多数桥梁实际上并未经过测试来确定其负载能力。通常，实际测试结构以确定额定载荷既费时又昂贵。结果，只能测试少量的桥。负载测试的主要耗时部分是设置常规仪器以监视被测桥梁的状态。通常，使用应变计和LVDT（或类似的）偏转传感器。目前，联邦公路管理局正在开发和测试可以对桥梁进行快速载荷测试的仪器。该仪器包括与夹紧式应变计接口的无线数据采集系统，可以在几分钟内将其放置在测量位置。此外，仪器还包括一个基于激光的远程偏转测量系统。两种类型的仪器（无线数据采集和基于激光的挠度测量）的结合，有可能允许对更多数量的结构进行额定载荷，从而更准确地反映国家桥梁的状况。 ！0

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