Typical seismic damage characteristics of bridges in the Ms6.2 Jishishan earthquake
This article mainly presents the investigation of bridges located in seismic intensity 8 degree and 7 degree zones on 306 Provincial Road,310 National Road and Chuanting Highway.Peak acceleration of over 900 cm/s2 was recorded at station GS.N0028 in the town of Dahejia,far exceeding the local rare earthquake fortification standard.However,the investigation results show that the bridges in the intensity 8 degree zone were mainly slightly damaged,including restrainer damage,lateral displacement of the main girder and bearing sliding,except for one bridge on Chuanting Highway where shear cracks were found in the pier,no other bridge in this area was found that suffered main structural damage.Bridges in the intensity 7 degree zone were basically intact,with some rubber deformations and unrecoverable displacements in the rubber bearings,as well as changes in the distance between restrainers.Fortunately,these issues did not affect their functionality.Concrete restrainer,as a measure to prevent lateral displacement of the main beam,has shown effectiveness in seismic damage,and is lack of rapid recovery characteristics.At the same time,the restrainer that installed cushion rubber pad also suffered severe damage,therefore,improving the cushioning device and considering the quick recovery of performance are needed in the future studies.
Jishishan earthquakeDahejia Yellow River Bridgerestrainer damagebearing slidingseismic damage of abutment
NETL
NSTL
万方数据
维普
