Lessons from the 2016 Kumamoto earthquake based on field investigations of damage to bridges. (2016)

• Record Type: Journal Article
• Authors: Akiyama, Mitsuyoshi; Takahashi, Yoshikazu; Hata, Yoshiya; Honda, Riki
• Is Part Of: International journal of earthquake and impact engineering. Volume 1:Number 3(2016)
• Page Start: 225
• Page End: 252
• Publication Date: 2016
• Subjects: Kumamoto earthquake -- bridge damage -- anti-catastrophe -- landslides -- seismic design codes -- seismic retrofit -- earthquakes -- bridges -- Japan
• Languages: English
• ISSNs: 2397-9372

Abstract

The Mw 7.0 Kumamoto earthquake occurred at 1:25 a.m. (local time) on April 16, 2016, in the Kumamoto Region of Kyushu Island, Japan, after the large foreshock on April 14. This paper presents the damage to bridges during the 2016 Kumamoto earthquake. Field investigations conducted after this earthquake proved the effectiveness of upgrades to seismic design codes and seismic retrofits. Meanwhile, as-built bridges over the Kyushu Expressway collapsed, preventing traffic passage. Some bridges designed according to design codes published after the 1995 Hyogo-ken Nanbu earthquake (i.e., Kobe earthquake) were severely damaged. In addition, several bridges were washed away or collapsed owing to the landslides caused by the strong ground motion. Lessons from the 2016 Kumamoto earthquake based on field investigations of damage to bridges are discussed herein. It indicates the necessity to establish the concept of 'anti-catastrophe' in the design code of bridges under multi-hazard circumstances, taking into consideration the occurrence of extreme events which are rare but can cause severe consequences.