为研究墩身内部分埋置核心钢管组合桥墩的抗震性能，考虑核心钢管埋置长度、规格以及轴压比和配箍率4个参数，设计了8个剪跨比λ=3.0的圆形截面桥墩试件进行拟静力试验。通过试验揭示此类桥墩的破坏机理，并分析各参数变化对墩身水平承载力、变形能力和强度衰减的影响规律。结果表明：受钢管埋置长度和规格大小的影响，部分埋置核心钢管组合桥墩呈现出墩身中部剪切、墩身中部弯曲和墩底区域弯曲破坏三种失效模式；随钢管埋置长度的增加，墩身的水平承载力逐渐提高，但变形能力则先增后减；增大配箍率或降低轴压比可改善此类桥墩的变形能力并提高其强度衰减的稳定性。最后，在分析此类桥墩受力特性的基础上，通过构造等效剪跨比的表达式，给出了其水平承载力的实用计算方法。
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.
关键词
钢-混凝土组合桥墩 /
抗震性能 /
拟静力试验 /
滞回曲线 /
水平承载力
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Key words
steel-concrete composite bridge column /
seismic behavior /
pseudo-static test /
hysteretic curves /
lateral load capacity
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