Numerical study on failure process and ultimate state of steel bearing under combined load

Hagere Alemayehu Gibe,Hiroki Tamai,Yoshimi Sonoda

doi:10.1016/j.heliyon.2020.e03764

Abstract

The limit state and deformation performance of steel bearing under seismic load is one of the most critical points to consider the effective or rational design of bridge against strong ground motion. In the 2016 Kumamoto earthquake, various bridges are damaged by the earthquake. Among the components of the bridge, steel bearings are the most damaged part of the bridge, which affects the functionality of the entire bridge. Since the 1995 Southern Hyogo Prefecture Earthquake, several studies about the ultimate state of steel bearing during earthquake carried out. However, there are a few studies on analyzing the failure processes and ultimate state of steel bearing when various loads assumed at the time of the earthquake. Therefore, the study investigates the failure process and ultimate state of pin bearing and pin-roller bearing under combined load using static push-over analysis. First, the bridge axis and perpendicular bridge axis horizontal loading directions proposed depending on the actual earthquake directional behavior of the bridge. Then the analysis of each bearing conducted and clarified the failure process of each bearing that leads to failure based on the von mises stress yield criteria. Three-dimensional finite element method used to analyze the bearings. The analysis result found that set bolt and pin neck tensile failure were the probable failure mode of pin bearing, and failure mode of pin-roller bearing depends on vertical and horizontal loading direction. In the future, the result used to propose a new seismic resistance design and reinforcement method of bearings that satisfies the required performance.

Highlights

Earthquake is one of the most destructive natural phenomena that cause various damage on both human life and infrastructure
Some examples of bridge failure caused by earthquake in worldwide are 1994 Northridge earthquake occurred in northwest of downtown Los Angles and caused considerable damage to bridge structure [1], the 1995 Southern Hyogo Prefecture Earthquake induced collapse of pilz bridge [2], 1999 Kocaeli and Duzce earthquake in Turkey, and Chi-Chi earthquake in Taiwan occurred and induced fault rapture of bridge [3], 2003 Bam earthquake occurred in southeastern region of Iran and caused significant damage of bridge [4], 2008 Wenchuan earthquake happened in Chain and induced extensive damage of bridge [5], 2009 L'Aquila earthquake occurred in central Italy and caused collapse of bridge [6], 2010 Chile Earthquake happened and induced bridge collapse [7], and 2016 Kumamoto earthquake occurred in Japan and caused numerous bridge failure [8]
The capacity of the bearing not reached at the ultimate state due to the bearing was not under failure when the analysis completed, and the stress introduced on the set bolt not exceeded the ultimate strength of the right side set bolt (940kN)

Summary

Introduction

Earthquake is one of the most destructive natural phenomena that cause various damage on both human life and infrastructure. This paper focused on the recent earthquake of Japan that caused various damage of bridge in Kumamoto prefecture. Investigation and analysis of bearing failure based on the damage situation of the bearings are necessary in order to understand deformation performance, failure process and ultimate resistance of the bearing at the time of the earthquake, and it's used to propose new seismic resistance design and reinforcement method that satisfies the required performance. At the time of earthquake, it is essential to analyze the stress state acted on the bearing under combined loading condition, so quantitative description of failure bearing components used to clarify the situation of the collapse of each member of bearings based on the relationship of lateral load and the corresponding displacement by using finite element method (FEM)

Methods

Results

Conclusion