预应力管桩振动台试验的数值分析
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摘要
为了研究地震作用下预应力管桩的抗震性能和提高预应力管桩的延性设计水平,通过进行预应力管桩振动台试验,了解有限桩基形式下振动特性,建立预应力管桩振动分析数值模型,模拟振动试验全过程。改变桩数量和输入不同地震波加速度峰值,探讨各种桩基础形式在地震作用下的反应及抗震性能。分析结果表明,对于4桩基础,在3倍桩径的位置出现桩身反向位移,在2.5倍桩径处出现桩身负弯矩,在4～9倍桩径的区域范围内会出现开裂弯矩,在5倍桩径的位置出现弯矩最大值,在15倍桩径位置之下开始桩身弯矩急剧减小,分析结果可为预应力管桩抗震设计、制造、施工提供可靠依据。
In order to research seismic performance of prestressed pipe pile under earthquake,and increase the level of ductility design of the prestressed pipe pile,the vibration characteristics of the pile foundation are grasped through the prestressed pipe pile shaking table test.This paper establishes the prestressed pipe pile numerical model of vibration analysis and simulates the whole process of the vibration test.On this basis,by changing the pile number and entering different seismic wave acceleration peaks,the reactions under the earthquake and seismic performance of the various pile foundation forms are explored.The results show that for four piles foundation,in the pile location of the three times diameter appears pile body reverse displacement;in the 2.5 times diameter of the pile appears pile body negative bending moment;within the region of four times to nine times appears cracking bending moment;in the position of the five times pile diameter appears the maximum bending moment;and under the location of fifteen times the pile diameter the pile body bending momeat decreases rapidly.The results provide a reliable basis for seismic design,manufacturing,construction of the prestressed pipe piles.
In order to research seismic performance of prestressed pipe pile under earthquake,and increase the level of ductility design of the prestressed pipe pile,the vibration characteristics of the pile foundation are grasped through the prestressed pipe pile shaking table test.This paper establishes the prestressed pipe pile numerical model of vibration analysis and simulates the whole process of the vibration test.On this basis,by changing the pile number and entering different seismic wave acceleration peaks,the reactions under the earthquake and seismic performance of the various pile foundation forms are explored.The results show that for four piles foundation,in the pile location of the three times diameter appears pile body reverse displacement;in the 2.5 times diameter of the pile appears pile body negative bending moment;within the region of four times to nine times appears cracking bending moment;in the position of the five times pile diameter appears the maximum bending moment;and under the location of fifteen times the pile diameter the pile body bending momeat decreases rapidly.The results provide a reliable basis for seismic design,manufacturing,construction of the prestressed pipe piles.
引文
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[11]温科伟,万少石,许开军,等.预应力管桩静载试验的三维数值模拟分析[C]//第十一届全国土力学及岩土工程学术会论文集.兰州:兰州大学学报,2011:45-49.
[2]BERGER E,MAHIN S A.Simplified method forevaluating soil-pile-structure interaction effects[C]//Offshore Technology Conference.Texas:[s.n.],1977:589-601.
[3]张崇文,赵剑明,张社荣,等.桩-土作用的动力非线性反应层元法[J].岩土工程学报,1996,18(4):l-10.ZHANG Chong-wen,ZHAO Jian-ming,ZHANGShe-rong,et al.Dynamic nonlinear finite layer elementmethod for pile-soil interaction analysis[J].ChineseJournal of Geotechnical Engineering,1996,18(4):l-10.
[4]赵振东,傅铁铭.桩头侧向集中荷载作用下桩-土系统的非线性动力性能分析[J].地震工程与工程振动,1997,17(3):47-59.ZHAO Zhen-dong,FU Tie-ming.Nonlinear dynamicbehaviors of pile-soil systems under lateral impulsivehead-loading[J].Earthquake Engineering andEngineering Vibration,1997,17(3):47-59.
[5]吴薪柳,姜忻良.结构-桩-土振动台试验桩土地震反应规律分析[J].工程力学,2011,28(1):201-204.WU Xin-liu,JIANG Xin-liang.Regulation analysis ofpile-soil seismic response based on structure-pile-soilshaking table test[J].Engineering Mechanics,2011,28(1):201-204.
[6]雷国辉,赵维炳,施建勇.锤击打入桩与土的共同作用分析[J].河海大学学报,1999,27(2):55-59.LEI Guo-hui,ZHAO Wei-bing,SHI Jian-yong.Analysisof interaction between driven pile and soil[J].Journal ofHohai University,1999,27(2):55-59.
[7]陈跃庆.结构-地基动力相互作用体系振动台试验研究[博士论文D].上海:同济大学,2001.
[8]张玉萍.抗滑桩振动台模型试验数值模拟[硕士论文D].成都:西南交通大学,2008.
[9]王平.桩-土-承台体系动力相互作用的数值模拟[硕士学位论文D].天津:河北工业大学,2006.
[10]刘宁.预应力混凝土管桩水平承载力现场试验及数值模拟[硕士论文D].太原:太原理工大学,2011.
[11]温科伟,万少石,许开军,等.预应力管桩静载试验的三维数值模拟分析[C]//第十一届全国土力学及岩土工程学术会论文集.兰州:兰州大学学报,2011:45-49.
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