ANALYSIS OF PALU IV BRIDGE FAILURE DUE TO PALU AND DONGGALA EARTHQUAKE ON 28TH SEPTEMBER 2018
The Collapse of Palu IV Bridge during the 28th September 2018 Central Sulawesi earthquake was one of the highlight events for representing the destructive effect of a 7.4 magnitude earthquake that was followed by a tsunami. So far, the causes of bridge collapse have been limited to hypotheses bas...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/42501 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The Collapse of Palu IV Bridge during the 28th September 2018 Central Sulawesi
earthquake was one of the highlight events for representing the destructive effect
of a 7.4 magnitude earthquake that was followed by a tsunami. So far, the causes
of bridge collapse have been limited to hypotheses based on field observation.
There are several theories regarding the collapse of the Palu IV Bridge such as
failure of bearings due to the large demand of base shear, buckling in the arch
ribs or the failure of the main girder.
In this study, the bridge will be modeled on a full scale using finite element
software Midas Civil. First, the bridge will be checked using the same codes as
the original design to acquire the model that represents the real condition of the
bridge. Next, the bridge will be checked with the most recent codes to determine
the bridge’s condition before the earthquake. All locations where possible failures
occurred will also be checked such as bearing failure, buckling on the arch ribs
and also a failure on the tie beam. Finally, Non-Linear Static Pushover Analysis
will be carried out to obtain the displacement capacity of the bridge, the sequence
of plastic hinges formation and the performance level of the bridge.
The results of the elastic linear analysis indicated that the main failure occurred
in the connection between the superstructure and substructure, where both the
anchor bolts and the bearings capacity were not able to withstand the shear
forces due to the earthquake load. Meanwhile, pushover analysis shows that the
performance of superstructure elements are at the level of fully operational for the
longitudinal direction of the bridge and operational for the transverse direction.
In pushover analysis, the bearing’s anchor bolts are assumed to have sufficient
capacity to withstand shear force from earthquake load.
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