Abstract
On 6 April 2021, a 200 m-long under-construction prestressed concrete bridge failed in the Chitwan District in central Nepal. Two of the four bridge spans collapsed without any notable evidence of dynamic force application. Under-construction bridge failures are sometimes reported and can have a significant impact on the future construction adjustments. Thus, a detailed study of failure mechanisms will be insightful for the structural engineering community. Aiming to document the failure modes and exemplify lessons for improvement, this paper reports the detailed component level failure mechanisms of the bridge using visual inspection, site measurements, finite element modeling, and some forms of non-destructive testing. The chronological failure mechanisms are presented based on the field evidence and juxtaposed with the results of analytical modeling. The sum of findings highlights that the dead load failure, triggered by the settlement of falseworks, is the most critically governing factor that initiated and aggravated the damage scenario.
Highlights
Received: 12 December 2021Bridges are critical infrastructures and the unrestricted operability of bridges must be assured, even after their exposure to severe dynamic forces, such as earthquakes, floods, and tsunamis, etc
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Using a forensic approach, we present a case study of an under-construction bridge collapse in this paper
Summary
Received: 12 December 2021Bridges are critical infrastructures and the unrestricted operability of bridges must be assured, even after their exposure to severe dynamic forces, such as earthquakes, floods, and tsunamis, etc. The authors recommended the use of pre- and post-event evidence to dissect the overturning collapse of box-girder bridges. Scattarreggia et al [6] analyzed the Caprigliola bridge collapse in Italy using field observations and the results of applied element modeling. They shed light on the damage mechanisms, assessing the most likely damage mechanism that intersected between observed and modeled scenarios. They further recommended intermixing regular monitoring and inspection as well as reliable structural modeling to outline the impending severities in bridge structures
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