| 柱脚可更换的地下结构抗震截断柱技术性能分析 |
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| 引用本文： | 杜修力,阴孟莎,刘洪涛,乔磊.柱脚可更换的地下结构抗震截断柱技术性能分析[J].震灾防御技术,2019,14(3):524-534. |
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| 作者姓名： | 杜修力 阴孟莎 刘洪涛 乔磊 |
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| 作者单位： | 北京工业大学, 城市与工程安全减灾教育部重点实验室, 北京 100124 |
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| 基金项目： | 国家重点研发计划项目（2018YFC1504302）,国家自然科学基金创新研究群体项目（51421005） |
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| 摘 要： | 基于功能可快速恢复的抗震韧性设计目标,结合提升中柱水平变形能力的地下结构抗震截断柱技术,提出了可有效避免由于柱脚应力集中产生的破坏和震后可快速更换的地下结构中柱设计思路,其中复合截断中柱与顶、底纵梁采用剪力销栓连接,柱脚部采用局部增强或增韧可更换材料进一步替代。采用数值模型分析了复合柱的承载力、变形能力以及柱脚采用不同材料时对复合柱变形和承载力的影响规律,并与整体现浇柱进行了对比。结果表明:一般截断柱的承载能力明显低于整体现浇柱,但其变形能力远远优于整体现浇柱。随着中柱变形的增加,一般截断柱中柱柱脚位置出现明显的“应力集中”现象,局部增强或增韧材料的采用可有效避免复合截断柱脚部因应力集中而产生的破坏,提高了复合截断柱的水平变形能力。
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| 关 键 词： | 浅埋地下结构 剪力销栓 可更换部件 数值分析 抗震性能 |
| 收稿时间： | 2019/5/11 0:00:00 |
Analysis of Technical Performance of Underground Structure Seismic Truncated Columns with Replaceable Column Foot |
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| Du Xiuli,Yin Mengsh,Liu Hongtao and Qiao Lei.Analysis of Technical Performance of Underground Structure Seismic Truncated Columns with Replaceable Column Foot[J].Technology for Earthquake Disaster Prevention,2019,14(3):524-534. |
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| Authors: | Du Xiuli Yin Mengsh Liu Hongtao and Qiao Lei |
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| Institution: | Key Lab of Urban Security and Disaster Engineering of the Ministry of Education, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | In order to design a technique for rapid recovery of seismic damage, by combining with the seismic interception column technology of the underground structure to improve the horizontal deformation capacity of the middle column, we propose the design idea of the column in the underground structure which can effectively avoid the damage caused by the stress concentration of the column foot and can be quickly replaced after the earthquake. The design idea of the column, wherein the composite truncated middle column and the top and bottom longitudinal beams are connected by a shear pin, and the column foot is further replaced by a partially enhanced or toughened replaceable material. The numerical model was used to analyze the bearing capacity and deformation capacity of the composite column and the influence of different materials on the deformation and bearing capacity of the composite column, and the results were compared with the overall cast-in-place column. We find that the bearing capacity of the general cut-off column is significantly lower than that of the overall cast-in-situ column, but its deformation ability is far greater than that of the overall cast-in-situ column. With the increase of the deformation of the middle column, the position of the column foot in the general cut column shows obvious "stress concentration" phenomenon. The use of local reinforcing or toughening material can effectively avoid the damage caused by the stress concentration of the foot of the composite truncated column and improve the horizontal deformation ability of the composite truncated column. |
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| Keywords: | Shallow buried underground structure Shearing dowel Replaceable part Numerical analysis Seismic performance |
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