Location

London

Event Website

http://www.csce2016.ca/

Description

Bridge structures often experience damage during an earthquake, which is one of the most devastating types of natural disasters. Base isolation can be employed to mitigate earthquake-induced damage. The main concept of base isolation is to reduce the seismic demand on the structure by shifting its fundamental time period away from the predominant periods associate with earthquakes. Base isolation involves placing horizontally flexible isolators between the bridge superstructure (i.e. deck/girder) and the substructure (i.e. pier/column). There are two main types of seismic isolators: (1) elastomeric, and (2) sliding. A fiber reinforced elastomeric isolator (FREI) is a particular type of reinforced elastomeric isolator. In an FREI the steel reinforcement used in a traditional elastomeric isolator is replaced with fiber fabric, which results in a reduction in the weight and potentially the manufacturing cost. FREI can be either bonded (B-FREI) or unbonded (U-FREI) to the substructure and superstructure. This paper investigates the behaviour of U-FREI under combined vertical, rotational, and lateral loading, as bridge bearings are expected to experience this combination of loads. Accordingly, the test program includes different vertical loads, angles of rotation, as well as a number of lateral sinusoidal input motions varying in both frequency and amplitude. The objective of this study is to investigate the response of U-FREI under serviceability and extreme loading conditions. The findings of this paper also address the feasibility of using U-FREI as bridge bearings/isolators.


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Jun 1st, 12:00 AM Jun 4th, 12:00 AM

NDM-563: THE VERTICAL, ROTATIONAL AND LATERAL RESPONSE OF UNBONDED FIBER REINFORCED ELASTOMERIC ISOLATORS

London

Bridge structures often experience damage during an earthquake, which is one of the most devastating types of natural disasters. Base isolation can be employed to mitigate earthquake-induced damage. The main concept of base isolation is to reduce the seismic demand on the structure by shifting its fundamental time period away from the predominant periods associate with earthquakes. Base isolation involves placing horizontally flexible isolators between the bridge superstructure (i.e. deck/girder) and the substructure (i.e. pier/column). There are two main types of seismic isolators: (1) elastomeric, and (2) sliding. A fiber reinforced elastomeric isolator (FREI) is a particular type of reinforced elastomeric isolator. In an FREI the steel reinforcement used in a traditional elastomeric isolator is replaced with fiber fabric, which results in a reduction in the weight and potentially the manufacturing cost. FREI can be either bonded (B-FREI) or unbonded (U-FREI) to the substructure and superstructure. This paper investigates the behaviour of U-FREI under combined vertical, rotational, and lateral loading, as bridge bearings are expected to experience this combination of loads. Accordingly, the test program includes different vertical loads, angles of rotation, as well as a number of lateral sinusoidal input motions varying in both frequency and amplitude. The objective of this study is to investigate the response of U-FREI under serviceability and extreme loading conditions. The findings of this paper also address the feasibility of using U-FREI as bridge bearings/isolators.

http://ir.lib.uwo.ca/csce2016/London/NaturalDisasterMitigation/43