桥梁墩柱在近断层水平多脉冲地震动作用下响应特征分析

发布时间：2018-03-23 12:06

本文选题：多脉冲分析　切入点：近断层　出处：《振动与冲击》2017年02期

【摘要】：对桥梁墩柱在近断层水平多脉冲地震动激励下的响应特征进行了研究。采用多脉冲小波分析方法从选取的22组地震动中识别出17组为脉冲型近断层地震动并确定了相关参数。采用时域叠加小波方法将这些时程与目标反应谱匹配得到匹配时程,通过匹配前后的时程和反应谱对比验证了匹配的有效性。基于Open Sees建立了四根桥梁墩柱模型并通过模态分析与Pushover分析验证了模型的合理性与准确性,加载匹配后的地震激励并分析其响应特征。分析表明,匹配时程的反应谱与目标反应谱基本一致,模型与试验的位移延性能力相对误差不超过5%。水平面内脉冲能量最强方向的地震输入能量大于水平面其他方向的输入能量,结构对应的地震需求也最大。从位移延性需求的角度应考虑水平最强能量的输入方向,抽取一个主要脉冲波形来替代原地震输入的做法偏于危险,应考虑多脉冲形式来代替单脉冲形式。
[Abstract]:The response characteristics of bridge pier columns under the excitation of horizontal multi-pulse ground motion near faults are studied. Using multi-pulse wavelet analysis method, 17 groups of near-fault ground motions are identified from 22 groups of ground motions selected and determined. The time-domain superposition wavelet method is used to match the time history with the target response spectrum to obtain the matching time history. The validity of the matching is verified by comparison of time history and response spectrum before and after matching. Based on Open Sees, four bridge pier column models are established, and the rationality and accuracy of the model are verified by modal analysis and Pushover analysis. The response spectrum of the matching time history is basically consistent with the target response spectrum. The relative error of displacement ductility between model and test is not more than 5. The input energy of earthquake in the strongest direction of pulse energy in horizontal plane is larger than that in other directions of horizontal plane. From the point of view of displacement ductility demand, the input direction of the strongest energy should be considered, and the method of taking a main pulse waveform to replace the original earthquake input is dangerous. Multi-pulse form should be considered instead of monopulse form.
【作者单位】：大连理工大学工程抗震研究所;大连理工大学海岸与近海工程国家重点实验室;
【基金】：国家自然科学基金项目(51678107) 高等学校博士学科点博导专项科研基金(20130041110036)
【分类号】：U442.55

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