SHAKING TABLE TEST FOR SEISMIC STRENGTHENING MEASURES OF EXISTING BRIDGE ABUTMENT IN LIQUEFIED GROUND

Abstract

 It has been known that existing bridge abutment in liquefied ground suffered great damage during past earthquakes. Rapid countermeasures become necessary when bridge abutment can't satisfy performance requirements of current standard. In this research, construction methods which can be conducted simultaneously with transportation or with less restriction based on conventional liquefaction countermeasures, ground anchor method and soil improvement method are discussed, and shaking table test is conducted to verify the strengthening effect. The result showed that ground anchor method performed well at restraint towards displacement of bridge abutment. However, additional countermeasures are still needed to be concerned for great settlement of the back ground. For soil improvement method, especially for the case when bridge abutment is enclosed by soil improvement body, proper space need to be established to avoid the risk of adverse effect.