| 脉冲型地震动作用下大跨输煤栈桥的动力响应 |
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| 引用本文： | 常志旺,潘毅,江赛雄,胡思远,李晰.脉冲型地震动作用下大跨输煤栈桥的动力响应[J].重庆建筑大学学报,2019,41(1):95-103. |
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| 作者姓名： | 常志旺 潘毅 江赛雄 胡思远 李晰 |
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| 作者单位： | 西南交通大学 土木工程学院, 成都 610031,西南交通大学 土木工程学院, 成都 610031;西南交通大学 抗震工程技术四川省重点实验室, 成都 610031,西南交通大学 土木工程学院, 成都 610031;西南电力设计院, 成都 610021,西南交通大学 土木工程学院, 成都 610031,西南交通大学 土木工程学院, 成都 610031 |
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| 基金项目： | 国家重点研发计划（2016YFC0802205）；国家自然科学基金（51508473、51708461） |
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| 摘 要： | 为研究近断层脉冲效应对火力发电厂钢结构输煤栈桥地震响应的影响，以某典型输煤栈桥结构为研究对象，采用基于能量的脉冲地震动识别方法，选取9条不同脉冲周期的近断层脉冲型地震动，利用标准脉冲数学模型的方法，剔除所选地震动中的脉冲成分，从而获得相应的9条非脉冲地震动。在此基础上，采用动力时程分析方法，对比脉冲地震动与非脉冲地震动对该典型输煤栈桥结构地震响应的影响。研究结果表明：脉冲型地震动会对输煤栈桥的地震响应产生显著影响，特别是脉冲周期与结构自振周期接近时，三向输入时脉冲效应对输煤栈桥结构响应的放大作用最明显，其最大放大系数为2.1；在脉冲型地震作用下，输煤栈桥的柱顶水平位移为弹塑性位移限值的1.36倍，将产生超出预期的严重破坏，其钢桁架跨中挠度为正常使用限值的2.97倍，将会严重影响结构的适用性及附属设备的安全。因此，在对近断层区域内的输煤栈桥结构进行抗震设计时，有必要考虑脉冲效应和地震动多维性对结构地震响应的影响，否则将低估结构的动力响应。
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| 关 键 词： | 输煤栈桥 脉冲型地震动 脉冲效应 地震响应 时程分析 |
| 收稿时间： | 2018/5/12 0:00:00 |
Dynamic response analysis of long-span coal-conveyer gallery subjected to pulse-like ground motions |
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| Chang Zhiwang,Pan Yi,Jiang Saixiong,Hu Siyuan and Li Xi.Dynamic response analysis of long-span coal-conveyer gallery subjected to pulse-like ground motions[J].Journal of Chongqing Jianzhu University,2019,41(1):95-103. |
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| Authors: | Chang Zhiwang Pan Yi Jiang Saixiong Hu Siyuan and Li Xi |
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| Affiliation: | School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China,School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China;Key Laboratory of Seismic Engineering of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, P. R. China,School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China;Southwest Electric Power Design Institute, Chengdu 610021, P. R. China,School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China and School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China |
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| Abstract: | To study the pulse effect on the seismic response of steel coal-conveyer gallery in thermal power plant, dynamic analysis of a typical coal-conveyer gallery structure was carried out in this paper. Firstly, the energy-based pulse-like ground motion identification method was adopted to select nine ground motions with different pulse periods. Secondly, the corresponding ground motions without pluses were obtained by using standard mathematical pulse model to remove the pulses from the selected pulse-like ground motions, and then, a comparative analysis was conducted considering the ground motions with and without pulses. Results show that pulse-like ground motions can significantly affect the structural responses, especially when the pulse period is close to the fundamental period of the structure. The pulse effect on the responses of coal-conveyer gallery is most obvious when the three-direction input is used, and the maximum value of amplification factor is 2.1. Under the pulse-like ground motions, the displacements of column top is 1.36 times of the elastoplastic displacement limit, which will cause serious damage beyond expectations. The mid-span deflection of steel truss is 2.97 times of the serviceability limit, which may adversely affect the serviceability of the structure and the safety of the attached equipment. Therefore, in seismic design, to avoid misleading estimates of the responses of structure, it is suggested that the pulse effect and the multi-dimensional input should be considered cautiously for the coal-conveyer gallery in the neat fault region. |
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| Keywords: | coal-conveyer gallery pulse-like ground motion pulse effect seismic response time historyanalysis |
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