以非破壞檢測進行鋼筋混凝土橋梁上部結構之安全評估(2/2)
Date Issued
2003-07-31
Date
2003-07-31
Author(s)
DOI
912211E002072
Abstract
Bridges play an indispensable role in land transportation. The
collapse of a bridge often results in tremendous losses. Therefore, the
safety assessment of bridges is an important and challenging task for civil
engineers.
The objective of this project is to develop a method to assess the
reliability of the upper structures of reinforced concrete bridges. The
safety of a bridge can be evaluated by means of reliability analysis. It
provides a reasonable estimate on the failure probability of the bridge if
the distributions of the uncertainties in the system are known. However,
as the bridge is damaged, the compressive strength of concrete may
decrease and corrosion of the steel reinforcement may occur. Apparently,
the distributions of the material should be modified and the reliability of
the bridge should be re-evaluated.
It is proposed in this study that nondestructive tests be performed on
the target bridge. Then, the Bayesian statistics is adopted to combine the
original statistics with the NDT data to give a reasonable estimate of the
current condition of the concrete and the reinforcement. As such, both the
original data and the new observations play equally important roles.
Finally, reliability analysis is performed on the target bridge using the
updated distributions of the concrete and steel reinforcement. The
limit-state function is formulated based on the design specifications. As
such, the reliability index of the bridge is comparable to the design value.
Both the T-beam bridge and the box girder bridge will be considered
in this study. In order to apply the proposed method to local bridges, this
study will also collect statistics regarding the dynamic load and pavement
in Taiwan.
Subjects
bridge
reinforced concrete
safety assessment
nondestructive
test
test
reliability.
Publisher
臺北市：國立臺灣大學應用力學研究所
Type
report
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