弯扭复合作用下RC圆形桥墩滞后性能及模型研究

发布时间：2018-08-05 20:51

【摘要】：多维地震作用下,斜交桥和曲线桥梁等非规则桥梁的钢筋混凝土(RC)桥墩受到轴压、弯曲、剪切和扭转复合作用,特别是在扭转作用,引起非规则桥梁RC桥墩弯剪失效,从而影响桥梁结构的抗震性能。为了阐明弯曲和扭转耦合作用对RC圆形桥墩滞后性能的影响,对扭弯比不同的12个RC圆形桥墩进行循环试验研究,评价弯扭相互作用对RC桥墩抗弯性能和抗扭性能的影响,并基于试件的破坏特征以及力和位移关系等试验结果,建立能够预测弯扭相互作用下RC桥墩滞后性能的恢复力模型。结果表明,弯扭相互作用降低了RC桥墩的抗弯和抗扭承载力,桥墩的变形特征和失效模式发生了改变,损伤破坏区域要高于弯曲塑性铰长度区域。提出的考虑扭弯比影响的RC桥墩的弯曲恢复力模型和扭转恢复力模型,可以较好预测弯扭相互作用下RC圆形桥墩的滞回性能。
[Abstract]:Under the action of multi-dimensional earthquake, the reinforced concrete (RC) piers of irregular bridges such as skew bridges and curved bridges are subjected to the composite actions of axial compression, bending, shear and torsion, especially in torsion, which results in the failure of flexural shear of RC piers of irregular bridges. Thus, the seismic performance of bridge structure is affected. In order to elucidate the effect of the coupling of bending and torsion on the hysteresis performance of RC circular pier, 12 RC circular piers with different torsion / bending ratio were studied by cyclic test, and the effects of bending-torsional interaction on flexural and torsional properties of RC pier were evaluated. Based on the failure characteristics of the specimens and the experimental results such as the relationship between force and displacement, a restoring force model is established to predict the hysteresis performance of RC piers under the interaction of bending and torsion. The results show that the flexural and torsional bearing capacity of RC piers is reduced by bending-torsion interaction. The deformation characteristics and failure modes of RC piers are changed, and the damage and failure zone is higher than that of flexural plastic hinges. The flexural restoring force model and torsional restoring force model of RC pier considering the effect of torsional and bending ratio can be used to predict the hysteretic behavior of RC circular pier under bending-torsional interaction.
【作者单位】：北京工业大学城市与工程安全减灾教育部重点实验室;
【基金】：国家自然科学基金(51178008,51378033) 国家重点基础研究计划(“973”计划)(2011CB013602) 北京市教委科研计划项目(KZ201410005011)
【分类号】：U443.22;U442.55

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