The
load-response correlation is a great concern for the management and
maintenance agency of bridges. Based on both the load test data and the
long-term structural health monitoring data, this study aims to characterize
the variation in the girder-end longitudinal displacement of a long-span
suspension bridge, i.e., the Zhaoyun
Bridge in Guangdong Province of China. The load test provides a valuable chance
to investigate the structural deformation in high loading levels, while the
structural health monitoring system records the real-time, in-site, and
long-term measurements in the normal operational stage of bridges. During the
load test, the movement direction of the main girder is found to depend on the
relative position of the center of gravity of the girder and the loading
vehicles. However, over the period of normal operation, the quasi-static
displacement at the ends of the main girder along the bridge axis is dominated
by the temperature variations, rather than the traffic loading. The
temperature-induced deformation is considerable so it should be filtered out
from the structural total responses to highlight the live load effects or the
anomalies of the bridge. As a case study, the temperature-displacement baseline
model of the Zhaoyun Bridge is established and then utilized to identify the
erroneous measurements in the structural health monitoring system. This paper
serves as a reference for the structural behavior interpretation and
performance evaluation of similar bridges.
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