Experimental study on seismic behavior of bridge columns with a partially-embedded core steel tube inside

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (9) : 19-29.

LI Wenwu1, QIU Wenliang2, TIAN Tian1, ZHANG Zhe2

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Abstract

In order to investigate the seismic behavior of bridge columns reinforced by a partially-embedded core steel tube(BCRPCT), eight circular column specimens with an aspect ratio of 3.0 were designed and tested under cyclic loading conditions.The test variables were core steel tube embedment length and specification, axial load ratio and stirrup ratio.Based on the test observations, the failure mechanism of BCRPCT is revealed.Besides, the effects of the test variables on the lateral load capacity, deformability and strength attenuation of BCRPCT are also evaluated.Test results demonstrate that affected by the core steel tube embedment length or specification, BCRPCT showed three different failure pattrens, namely shear failure or flexural failure at the column mid-height and flexural failure at the column base.With the increase of core steel tube embedment length, the lateral load capacity of BCRPCT was progressively enhanced; however, the deformability exhibited a tend of first increase and then decrease.It is also found that the deformability and the stability of strength attenuation can be improved by increasing the stirrup ratio or decreasing the axial load ratio.At last, on the basis of analysis of the mechanical properties, the practical method for lateral load capacity predition of BCRPCT is suggested through construct the intermediate variable of equivalent aspect ratio.

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steel-concrete composite bridge column / seismic behavior / pseudo-static test / hysteretic curves / lateral load capacity

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LI Wenwu1, QIU Wenliang2, TIAN Tian1, ZHANG Zhe2. Experimental study on seismic behavior of bridge columns with a partially-embedded core steel tube inside[J]. Journal of Vibration and Shock, 2021, 40(9): 19-29

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