Experimental Study of a Model of the Ice-induced Dynamics of Bridge Piers in Cold Regions
Ice-induced vibrations significantly affect the comfort and safety of bridges in cold regions.This study considers a typical simply supported girder bridge in the upper Songhua River,exposed to ice.Using a scaled bridge model established using similarity theory,we investigate the impact of an ice row's impact location and impact velocity on dynamic ice loading and the resulting response of the bridge pier structure.We decipher the time-course characteristics of the ice-induced force and determine the law of ice-induced vibration coupling.The test results show that extrusion crushing occurs first after the ice row impacts,followed by longitudinal cleavage.The ice-row crushing process occurs simultaneously with the extrusion of crushed ice and spalling.The ice-breaking prism structure is very efficient:the ice force value of the ice platoon in the test for an impact speed of 7 cm·s-1 is approximately twice the value for 52.63 cm·s-1.The structural response to impact on the ice-breaking prism is significantly smaller than that to impact on the round pier.The transverse acceleration response peaks at the moment when the ice row splits,and the strain and displacement response amplitudes do not change significantly with the ice-row velocity.The strain and displacement curves at the ice loading stage agree well with the ice force action process.The strain and displacement responses can therefore be utilized to invert the ice force time course,thus providing a solution to the difficult challenge of deploying force sensors.Hence,this modeling study of ice-induced vibrations in bridge piers in cold regions provides a data basis for the safety assessment,structural design,and abnormal warning.
bridge engineeringice-excited vibrationmodel testbridges in cold regionice force loadingstructural response
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