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首页> 外文期刊>Journal of Performance of Constructed Facilities >Live-Load Test Comparison and Load Ratings of a Posttensioned Box Girder Bridge
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Live-Load Test Comparison and Load Ratings of a Posttensioned Box Girder Bridge

机译：后张式箱梁桥的活载试验比较和额定载荷

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摘要

This paper presents a comparison of two live-load tests performed on a posttensioned, box-girder bridge. The initial live-load test was performed more than 20 years before the most recent test. Strain gauges were placed at the same location for both tests. In each case, the bridge was subjected to nearly identical loads so that changes in strain could be correlated as a heavy track drove across the instrumented bridge. A comparison of the bridge behavior based on the two load tests is presented. The changes in recorded strain were also used to validate a detailed finite-element (FE) model using primarily shell elements. From this calibrated FE model, the live-load distribution factors for moment were obtained. These factors were used to calculate both the inventory and operating rating factors of the bridge. These values were compared with those calculated in accordance to the AASHTO LRFD specifications for distribution factors. It was found that the rating factors could be increased by 26% because of the partial fixity caused by the integral abutments.
机译：本文介绍了在后张拉的箱梁桥上进行的两个活载试验的比较。最初的活载测试在最近的测试之前进行了20多年。两种测试的应变仪均放置在同一位置。在每种情况下，桥都承受几乎相同的载荷，因此，当重的轨道驶过仪表桥时，应变的变化可能相关。给出了基于两个载荷测试的桥梁行为的比较。记录的应变变化还用于验证主要使用壳单元的详细有限元（FE）模型。从该校准的有限元模型中，获得了力矩的活载分配因子。这些因素被用来计算桥梁的库存和运营评级因素。将这些值与根据AASHTO LRFD规范针对分配因子计算的值进行比较。发现由于整体式基台引起的部分固定，定级系数可以增加26％。

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