Abstract

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Title:: Shaking table test of bridge pounding and analysis on parameter sensitivity

Author(s):: LI Qing-ning; YIN Jun-hong; ZHANG Rui-jie; SUN Jian-peng; (School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China)

Keywords:: bridge engineering; bridge pounding; shaking table test; impact force; contact element; contact stiffness; damping ratio; width of expansion joint

Abstract:: To study the numerical simulation method and characteristics of bridge pounding response under earthquake, four specimens of structure for pounding were designed, and the shaking table test was carried out. Four kinds of models such as the linear elastic, Kelvin-Voigt and Hertz, as well as Jan-Hertz-damp were introduced to the numerical simulation analysis, the results of test were validated numerically, and impact of bridge pounding on parameter sensitivity was studied. The results show that the accuracy of Jan-Hertz-damp contact element model is the highest in simulation analysis, but it takes a relatively long time to run. Setting materials with small contact stiffness at the bridge expansion joints and increasing the difference of bridge damping and adjacent damping ratio can reduce the impact force response of bridge structures. Impact force of bridge is not sensitive to width of expansion joint. With the increase of width of bridge expansion joint, the overall trend of impact force is reduced. Impact force response is related to dynamic characteristics of bridges, as with peak and spectrum character of input seismic wave.