Statistical Analyses of the Non-Uniform Longitudinal Temperature Distribution in Steel Box Girder Bridge

The frequently conventional assumption that bridge temperature is uniformly distributed on long-span bridges could lead to uncertainty when analyzing effects. This study investigated the surface of steel box girders a suspension bridge, emphasizing distribution characteristics in longitudinal (spanwise) direction. girder was monitored using long-term structural health monitoring system (SHMS). First, probability density functions (PDF) were analyzed. results showed PDFs had bimodal and be well-fitted weighted superposition two normal distributions. Meanwhile, there an obvious difference between measuring points at different sections which inconsistent with Subsequently, distributions statistically analyzed, polynomial introduced fit curves along left right sides mid-span. A correlation analysis then performed, highlighting variability Additionally, pattern summarized as (i) highest mid-span, lowest tower, increasing side span; (ii) also significant differences Finally, time- space- studied, contour map displayed. three-dimensional spatial not only non-uniformly space but time. work useful for more accurate effects bridges.