VARIOUS TECHNICAL IDEAS TO MITIGATE EFFECT OF GROUND MOVEMENT ON PERFORMANCE IN SHIN-ASO-OHASHI BRIDGE

Abstract

 For a planning of the reconstruction of Aso-Ohashi bridge that was collapsed by the 2016 Kumamoto earthquake, a risk of the unexpected ground movement should be considered because an active fault exists near the bridge. It has been therefore essential study to mitigate the effect of the ground movement on performance (safety, serviceability and reparability) of the bridge at the process of a route planning as well as the structural design work.

 This paper presents several technical ideas to improve the structural redundancy and the structural resilience of the reconstructed bridge, namely Shin-Aso-Ohashi bridge which crosses the active fault. The Shin-Aso-Ohashi bridge was planned to equip with damage-controlled bearing supports so that the bridge would exhibit the predicted desirable damage and thus redundant response against the unexpected excessive fault displacement. A design concept of the damage-controlled structure is also introduced in this paper.