| 土-结构动力相互作用问题分析中地震动输入的一种新方法 |
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| 引用本文： | 刘晶波,谭辉,王东洋,宝鑫.土-结构动力相互作用问题分析中地震动输入的一种新方法[J].西北地震学报,2019,41(1):1-8. |
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| 作者姓名： | 刘晶波 谭辉 王东洋 宝鑫 |
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| 作者单位： | 清华大学 土木工程系, 北京 100084,清华大学 土木工程系, 北京 100084,清华大学 土木工程系, 北京 100084,清华大学 土木工程系, 北京 100084 |
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| 基金项目： | 国家自然科学基金项目（51478247）；国家自然科学基金重大研究计划集成项目（91215301）；国家973项目（2011CB013602） |
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| 摘 要： | 为实现地震作用下土-结构动力相互作用问题的有限元模拟,需要在人工边界上完成地震动的有效输入,目前工程和科研中常用的地震动输入方法有两种:波动输入方法和振动输入方法。波动输入方法的模拟精度高,但实施上相对复杂且耗时,而振动输入方法处理简单,但模拟精度较低。针对应力型人工边界提出一种在人工边界上实现地震动输入的新方法,该方法通过对土-结构有限元模型中由人工边界节点及相邻节点组成的局部子结构施加自由波场位移时程并进行动力分析,从而直接获得可实现地震波动有效输入的等效地震荷载,然后在土-结构有限元模型的人工边界节点上施加等效输入地震荷载并完成动力计算,由此完成土-结构动力相互作用问题的地震动输入和地震反应计算。与原有波动输入方法相比,新方法避免了原方法需分别计算人工边界上自由场应力和由引入人工边界条件引起的附加力,以及需要根据不同人工边界面的外法线方向确定荷载作用方向等较为复杂的处理过程,具有等效地震荷载计算简便、地震动输入过程更易于实施的特点。采用均匀弹性半空间和成层弹性半空间一维地震反应算例初步验证新方法的正确性和可靠性。
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| 关 键 词： | 地震动输入 波动输入方法 振动输入方法 人工边界 等效输入地震荷载 |
| 收稿时间： | 2017/5/17 0:00:00 |
A New Seismic Motion Input Method in Soil-StructureDynamic Interaction Analysis |
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| LIU Jingbo,TAN Hui,WANG Dongyang and BAO Xin.A New Seismic Motion Input Method in Soil-StructureDynamic Interaction Analysis[J].Northwestern Seismological Journal,2019,41(1):1-8. |
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| Authors: | LIU Jingbo TAN Hui WANG Dongyang and BAO Xin |
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| Institution: | Department of Civil Engineering, Tsinghua University, Beijing 100084, China,Department of Civil Engineering, Tsinghua University, Beijing 100084, China,Department of Civil Engineering, Tsinghua University, Beijing 100084, China and Department of Civil Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | It is necessary to effectively input seismic motion on artificial boundaries to accomplish finite element simulation of the soil-structure dynamic interaction model subjected to seismic load. There are two kinds of seismic motion input methods commonly used in engineering and scientific research, including the wave input method and the vibration input method. The wave input method exhibits high simulation accuracy; however, its implementation is relatively complicated and is time-consuming. Further, the vibration input method is simple to process even though it exhibits low accuracy. In this study, a new method is proposed to provide the seismic motion input on stress-type artificial boundaries. By imposing the displacement-time history of the free field to the local substructure, containing nodes on the artificial boundaries and adjacent nodes in the soil-structure interaction finite element model, and by performing dynamic analysis, the equivalent seismic loads used to accomplish the effective input of the seismic load were directly obtained. The equivalent seismic loads were imposed on the nodes of the artificial boundaries for performing dynamic analysis. At this point, the seismic motion input and seismic response analysis of the soil-structure dynamic interaction problem were completed. When compared with the original wave input method, the proposed method avoids the complex calculation processes associated with the free field stress on the artificial boundaries and the additional forces caused by the artificial boundaries; further, it also does not require to define the directions of the loads based on the external normal directions of the artificial boundaries. The new method concisely determined the equivalent seismic loads and provided the seismic motion as input. The validity and reliability of the new method were preliminarily verified using the one-dimensional seismic response examples of homogenous elastic half-space and layered half-space. |
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| Keywords: | seismic motion input wave input method vibration input method artificial boundary equivalent input seismic load |
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