地震作用下钢筋混凝土桥墩残余位移研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (13) : 130-134.

论文

地震作用下钢筋混凝土桥墩残余位移研究

王军文1，李海洋2，闫聚考3，石岩4

作者信息 +

Residual displacements of RC piers under action of earthquake

WANG Jun-wen1, LI Hai-yang2, YAN Ju-kao3，SHI Yan4

Author information +

文章历史 +

摘要

为更深入了解地震作用下钢筋混凝土桥墩墩顶残余位移与最大位移关系，提出精度更高的残余位移估算方法。首先利用OpenSees地震仿真软件中的纤维梁柱单元建立了钢筋混凝土桥墩的动力计算模型，通过与已有钢筋混凝土桥墩振动台试验结果的对比，验证了计算模型的可靠性；其次通过研究桥墩轴压比、长细比、纵筋配筋率、体积配箍率、纵筋强度硬化系数、纵筋与混凝土强度比等参数对钢筋混凝土桥墩墩顶残余位移延性指标的影响规律；最后通过回归分析建立了残余位移影响系数随以上参数变化的预测公式，并通过已有振动台试验数据验证了计算公式的合理性。研究结果表明：与日本规范相比，推荐公式对残余位移的估算值与试验值更接近，可用于基于性能抗震设计时初步估算地震作用下钢筋混凝土桥墩的残余位移值。

Abstract

To understand deeply the relationship between residual displacement and maximum displacement of reinforced concrete (RC) piers under action of earthquake, a more accurate estimation method for residual displacement was proposed. Firstly, using the fiber beam-column element in the seismic response simulation software OpenSees, a dynamic analysis model for RC piers was established, its reliability was verified through comparing the results computed using this model with those of the existing RC piers’ shaking table tests. Secondly, the effect laws of various parameters including piers’ axial compression ratio, aspect ratio, longitudinal reinforcement ratio, transverse reinforcement ratio, strength hardening coefficient of longitudinal reinforcement and ratio of longitudinal reinforcement yield strength to concrete compression strength on the ductility index of RC pier top’s residual displacement were analyzed. Finally, the prediction formula for the residual displacement influence coefficient with variation of these parameters was obtained with the regression analysis. The rationality of this formula was verified using the existing RC piers’ shaking table test data. The study results showed that compared with the Japanese specification, RC piers’ residual displacements estimated with the proposed formula are closer to test data; the proposed formula can be used to preliminary estimate RC piers’ residual displacements under action of earthquake when performing aseismic designs based on performances.

导出引用

王军文1，李海洋2，闫聚考3，石岩4. 地震作用下钢筋混凝土桥墩残余位移研究[J]. 振动与冲击, 2018, 37(13): 130-134

WANG Jun-wen1, LI Hai-yang2, YAN Ju-kao3，SHI Yan4. Residual displacements of RC piers under action of earthquake[J]. Journal of Vibration and Shock, 2018, 37(13): 130-134

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