地铁运行区域新建建筑全过程实测与数值模拟

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摘要以邻近地铁线路的某新建建筑为例，对从项目动工至建筑封顶过程中的主要节点进行全过程实测，得到地铁经过时自由场地及施工不同阶段建筑内部各楼层的振动数据。建立单体的有限元模型，采用不同的激励输入方式进行数值模拟，并将计算结果与实测结果进行对比验证，以获取既有地铁运行区域拟建建筑施工前振动预测的有效方法。在数值分析过程中，针对环境振动，提出了“原位激励”的概念。分析结果表明：一致激励输入仅适用于建筑平面尺寸较小时进行初步预测；原位激励与多点激励的输入方式计算结果准确可靠，可满足设计各个阶段的振动预测需求；根据不同的需求可分别选择采用原位激励或多点激励的输入方式进行振动预测；采用自由场地实测结果作为输入激励进行振动预测时，可将计算结果根据不同的建筑类型进行修正。该研究成果可对既有地铁运行区域拟建建筑施工前进行振动评价提供参考。

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	钟才敏1
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	马人乐1
	吴学淑2

关键词 ：地铁振动, 数值模拟, 原位激励, 多点激励, 振动预测

Abstract：Based on a new building adjacent to metro line, whole process field tests were made on free field before construction and floors of different construction phases. The finite models of building were established and numerical calculations were carried out by adopting different excitation modes, and the calculated results were compared with the field test results. In the process of analysis, the numerical analysis method of "in situ excitation" was put forward in view of the environmental vibration. The results show that the "uniform excitation" input is only suitable for the preliminary prediction of small size building; the results of "in-situ excitation" and "multi-support excitation" input are accurate and reliable which can be used to predict the demand of different design phases. Meanwhile, "in situ excitation" or "multi-support excitation" could be chosen according to different requirements. When the field test results of free field are used as excitation to predict vibration, the calculation results can be amended according to different building types.

Key words： metro vibration numerical simulation in situ excitation multi-support excitation；vibration prediction

收稿日期: 2016-10-08 出版日期: 2017-10-27

引用本文:

钟才敏1，2，马人乐1，吴学淑2. 地铁运行区域新建建筑全过程实测与数值模拟[J]. 振动与冲击, 2017, 36(20): 173-179.
Zhong Caimin1, 2, Ma Renle1, Wu Xueshu2 . Whole process field tests and numerical simulation of new building in metro operation area. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(20): 173-179.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I20/173

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