Abstract
With increasing traffic volume, the traffic load grade given by design codes has gradually increased. For new bridges, there is no problem, and the traffic load can be met through the requirements of the new code. However, for existing bridges, there is a lack of uniform standards on whether they can continue to be used. It is not clear whether these bridges will be judged according to the new code or the original design code. The traffic loading effects of different codes on medium‐ and small‐span girder bridges in China are investigated in this study. Three codes are introduced: JTJ 021‐89, JTG D60‐2004, and JTG D60‐2015. Simply supported girder bridges and continuous girder bridges are discussed. The traffic loading effects calculated based on JTG D60‐2015 are significantly larger than those calculated based on JTJ 021‐89. For simply supported girder bridges, most of the differences range from 20% to 40%, and the maximum value is almost larger than 60%. For continuous girder bridges, most of the differences in the positive bending moments are concentrated in the 20%∼40% range, while the differences in the negative bending moments range from 10% to 20%. Therefore, the differences in traffic loading effects calculated based on various codes cannot be ignored in actual bridge engineering. The conclusion in this study can provide a basis for bridge structure evaluation and life prediction.
Highlights
Bridges are one of the most important civil structures
For continuous girder bridges, the number of spans has only a small influence. e positive bending moment is much more sensitive than the negative bending moment with various codes. e positive bending moments calculated based on JTG D60-2004 and JTG D602015 are significantly larger than those calculated based on JTJ 021-89
Most of the differences in the positive bending moments are concentrated in the 20%∼40% range. e differences in the negative bending moment range from 10% to 20%
Summary
Bridges are one of the most important civil structures. By the end of 2019, approximately 878300 highway bridges were built in China; most of them were medium- and small-span girder bridges [1]. Different from other civil structures, the traffic load is the most important load. Advances in Civil Engineering e differences among various codes have been investigated by many researchers [8,9,10,11,12,13,14]; most of them have focused on early codes and supported girder bridges. E characterization of live load models is of paramount importance for an accurate evaluation of the structural safety and reliability of bridges and the calibration of design loads for use when designing new bridges or assessing the safety of existing bridges [17,18,19,20]. Traffic loading effects in different codes on medium- and small-span girder bridges in China are investigated in this study.
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