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A platform for research: civil engineering, architecture and urbanism
The seismic vulnerability of skewed bridges has been realized in many major earthquakes. Damage to skewed bridges has been found to be aggravated by the occurrence of collisions between the bridge segments and adjacent abutments. Some bridges have even suffered catastrophic failures or unseating of girders due to the pounding. To study this phenomenon, a 1:20 scale straight and 30° skewed bridge-abutment model were constructed and subjected to uniform ground excitations through shake table testing. This paper focuses on the girder unseating potential of skewed bridges based on the girder seating length requirements specified in the New Zealand Transport Agency (NZTA) bridge manual. It was found that pounding restricts the girder movement in the longitudinal direction, causing significant reduction of the relative displacements. However, pounding of the skewed bridge induces out-of-plane movements, generating large transverse relative displacements. It was further deduced that the seating length requirements specified in the NZTA bridge manual for skewed bridges could potentially severely underestimate its girder unseating potential.
The seismic vulnerability of skewed bridges has been realized in many major earthquakes. Damage to skewed bridges has been found to be aggravated by the occurrence of collisions between the bridge segments and adjacent abutments. Some bridges have even suffered catastrophic failures or unseating of girders due to the pounding. To study this phenomenon, a 1:20 scale straight and 30° skewed bridge-abutment model were constructed and subjected to uniform ground excitations through shake table testing. This paper focuses on the girder unseating potential of skewed bridges based on the girder seating length requirements specified in the New Zealand Transport Agency (NZTA) bridge manual. It was found that pounding restricts the girder movement in the longitudinal direction, causing significant reduction of the relative displacements. However, pounding of the skewed bridge induces out-of-plane movements, generating large transverse relative displacements. It was further deduced that the seating length requirements specified in the NZTA bridge manual for skewed bridges could potentially severely underestimate its girder unseating potential.
Influence of Pounding on the Girder Unseating Potential of Skewed Bridges
Seventh China-Japan-US Trilateral Symposium on Lifeline Earthquake Engineering ; 2016 ; Shanghai, China
2017-08-10
Conference paper
Electronic Resource
English
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