Investigating the dynamic response and damage condition of variable-section single pile in seismic subsidence site,taking Xiang'an Bridge as the engineering background,the dynamic response of variable-section single pile under 0.10g-0.45g ground vibration intensity was investigated through large shaking table tests,and the damage degree was evaluated and analyzed.Results are as follows:Influenced by the seismic subsidence characteristics of the soil layer,the top horizontal displacement,acceleration,and bending moment of the variable-section single pile tend to increase with the increase of vibration intensity,while the base frequency of the variable-section single pile gradually decreases.The maximum bending moment of the variable-section single pile occurs at the seismic subsidence soil stratum demarcation,where the ground shaking strength of 0.30g exceeds its flexural capacity.At a ground vibration intensity of 0.20g,the top horizontal displacement,acceleration,bending moment of the variable-section single pile increase significantly,and the base frequency of the pile decreases abruptly.Based on the system damage theory,the damage condition of variable-section single piles in seismic subsidence sites can be divided into three stages:stable stage,intensified damage stage,and plastic failure stage.At the end of the test,bending plastic damage occurred at the location of the variable section.
关键词
桥梁工程/软土震陷/振动台试验/变截面单桩/动力响应
Key words
bridge engineering/seismic settlement for soft soil/shaking table test/variable-section single pile/dynamic response
维普
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