钢管混凝土桩低应变动测响应研究
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摘要
为更好地服务于钢管混凝土桩的低应变测试,文章建立钢管混凝土桩和混凝土桩三维有限元模型,对钢管混凝土桩和混凝土桩的低应变瞬态动测响应进行数值模拟,得到完整桩和缺陷桩的速度响应结果。通过对钢管混凝土桩和混凝土桩的速度时域响应和速度云图的对比,分析钢管混凝土桩桩顶速度时域响应特性和桩身应力波传播特性,同时得出一类典型缺陷钢管混凝土桩顶速度响应曲线的规律。研究结果表明:钢管混凝土桩顶入射波存在与混凝土桩类似的三维效应,当桩身长度较短时,桩顶面距桩心距离越远点的桩底反射波到达时间越早,波峰值越小;应力波在钢管混凝土桩中传播较混凝土桩快,当速度波传播到达一定深度后速度波波前呈拱形传播,对应的混凝土桩呈平面传播;变模量钢管混凝土缺陷桩的缺陷反射波规律和混凝土桩一致,混凝土桩的缺陷反射波较钢管混凝土桩更为显著。
A three-dimensional finite element model was established to simulate the wave propagation in low strain dynamic testing of concrete filled steel piles and concrete piles in order to get a better effect of low strain integrity testing of concrete filled steel piles. The velocity responses in time domain on the top of intact piles and defective piles were obtained. By comparing the velocity responses and snapshots of concrete filled steel piles with concrete piles,the characteristics of the velocity responses of intact piles and the transient waves in pile body,as well as the regularity of the velocity responses curves of defective piles were analyzed. The results reveal that the three-dimensional effects of incident waves of concrete filled steel piled are similar to concrete piled,and the further the point away from the pile center,the earlier the arrival time of the peak of reflected wave. On the contrast,the peak values have opposite relationship. Stress waves transient faster in steel than that in concrete,which results in the wavefronts in concrete filled steel piles presenting an arch shape when it reaches a certain depth and a plane shape in concrete piles. The regularity of defective reflected waves of concrete filled steel piles is the same as concrete piles,while the defective reflected waves of concrete piles are more remarkable.
A three-dimensional finite element model was established to simulate the wave propagation in low strain dynamic testing of concrete filled steel piles and concrete piles in order to get a better effect of low strain integrity testing of concrete filled steel piles. The velocity responses in time domain on the top of intact piles and defective piles were obtained. By comparing the velocity responses and snapshots of concrete filled steel piles with concrete piles,the characteristics of the velocity responses of intact piles and the transient waves in pile body,as well as the regularity of the velocity responses curves of defective piles were analyzed. The results reveal that the three-dimensional effects of incident waves of concrete filled steel piled are similar to concrete piled,and the further the point away from the pile center,the earlier the arrival time of the peak of reflected wave. On the contrast,the peak values have opposite relationship. Stress waves transient faster in steel than that in concrete,which results in the wavefronts in concrete filled steel piles presenting an arch shape when it reaches a certain depth and a plane shape in concrete piles. The regularity of defective reflected waves of concrete filled steel piles is the same as concrete piles,while the defective reflected waves of concrete piles are more remarkable.
引文
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[4]童寿兴,商涛平.拱桥拱肋钢管混凝土质量的超声波检测[J].无损检测,2002,24(11):464-466.TONG Shouxin,SHANG Taoping.Ultrasonic testing of the quality of the steel pipe arch filled with concrete[J].NDT,2002,24(11):464-466.
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[6]雷林源,杨长特.桩基瞬态动测响应的数学模型及基本特性[J].地球物理学报,1992,35(4):501-509.LEI Linyuan,YANG Zhangte.The mathematical models and basic characters of transient response for dynamic test of pile[J].Acta Geophysica Sinica,1992,35(4):501-509.
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[9]陈凡,王仁军.尺寸效应对基桩低应变完整性检测的影响[J].岩土工程学报,1998,20(5):95-99.CHEN Fan,LUO Renjun.Dimension effect on low strain integrity testing of prestressed pipe piles[J].Chinese Journal of Geotechnical Engineering,1998,20(5):95-99.
[10]费康,刘汉龙,张霆.PCC桩低应变检测中的三维效应[J].岩土力学,2007(6):1095-1102.FEI Kang,LIU Hanlong,ZHANG Ting.Three-dimensional effects in low strain integrity test of PCC pile[J].Rock and Soil Mechanics,2007(6):1095-1102.
[11]罗文章.管桩在低应变瞬态集中荷载作用下的速度响应研究[D].北京:中国建筑科学研究院,2002.LUO Wenzhang.Velocity response study on pipe piles under low strain transient concentrated load[D].Beijing:China Academy of Building Research,2002.
[12]赵振东,杉本三千雄,铃木善雄.桩基低应变完整性检测的分析研究[J].地震工程与工程振动,1995,15(4):104-111.ZHAO Zhendong,SUGIMOTO Michio,SUZUKI Yoshio.Analytical study on low strain integrity testing for piles[J].Earthquake Engineering and Engineering Vibration,1995,15(4):104-111.
[13]Ding X M,Liu H L,Liu J Y,et al.Wave propagation in a pipe pile for low-strain integrity testing[J].Journal of Engineering Mechanics-ASCE,2011,137(9):598-609.
[14]Ding X M,Liu H L,Z B.High-frequency interference in low strain integrity testing of large-diameter pipe piles[J].Science China-Technological Sciences,2011,54(2):420-430.
[15]Ding X M,Liu H L,Chen Y M,et al.Analytical solution of wave propagation in large-diameter piles for low strain integrity testing[C]//Advances in Pile Foundations,Geosynthetics,Geoinvestigations,and Foundation Failure Analysis and Repairs-Proceedings of the 2011 Geo Hunan International Conference,2011,220(GSP):65-74.
[16]LIN Y,Sansalone M,Carino N J.Impact-echo response of concrete shafts[J].Geotech Test J,1991,14(2):121-37.
[17]Huang Y H,Ni S H,Lo K F,et al.Assessment of identifiable defect size in a drilled shaft using sonic echomethod:Numerical simulation[J].Computers and Geotechnics,2010(37):575-768.
[2]钟善桐.钢管混凝土结构应用范围的扩展[J].哈尔滨建筑工程学院学报,1994,(2):24-31.ZHONG Shantong.Application enlargement of concrete filled steel tubular structure[J].Journal of Harbin Institute of Technology,1994(2):24-31.
[3]周先雁,肖云风,曹国辉.用超声波法检测钢管混凝土质量的研究[J].铁道科学与工程学报,2006,3(6):50-54.ZHOU Xianyan,XIAO Yunfei,CAO Guohui.Research on ultrasonic detection for concrete-filled steel tube[J].Journal of railway science and engineering,2006,3(6):50-54.
[4]童寿兴,商涛平.拱桥拱肋钢管混凝土质量的超声波检测[J].无损检测,2002,24(11):464-466.TONG Shouxin,SHANG Taoping.Ultrasonic testing of the quality of the steel pipe arch filled with concrete[J].NDT,2002,24(11):464-466.
[5]梁鸣,刘沐宇,冯仲仁.钢管混凝土超声波检测与评价试验研究[J].武汉理工大学学报,2001,23(12):44-46.LIANG Ming,LIU Muyu,FENG zhongren.Study of ultrasonic detection and evaluation for the deficiency recognition of concrete-filled steel tube[J].Journal of Wuhan University of Technology,2001,23(12):44-46.
[6]雷林源,杨长特.桩基瞬态动测响应的数学模型及基本特性[J].地球物理学报,1992,35(4):501-509.LEI Linyuan,YANG Zhangte.The mathematical models and basic characters of transient response for dynamic test of pile[J].Acta Geophysica Sinica,1992,35(4):501-509.
[7]徐攸在,刘兴满.桩的动测新技术[M].北京:中国建筑工业出版社,1989.XU YOUzai,LIU Xinman.New technology of dynamic testing for piles[M].Beijing:China Building Industry Press,1989.
[8]Chow Y K,Phoon K K,Chow W F,et al.Low strain integrity testing of plies:three-dimensionsaleffect[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(11):1057-1062.
[9]陈凡,王仁军.尺寸效应对基桩低应变完整性检测的影响[J].岩土工程学报,1998,20(5):95-99.CHEN Fan,LUO Renjun.Dimension effect on low strain integrity testing of prestressed pipe piles[J].Chinese Journal of Geotechnical Engineering,1998,20(5):95-99.
[10]费康,刘汉龙,张霆.PCC桩低应变检测中的三维效应[J].岩土力学,2007(6):1095-1102.FEI Kang,LIU Hanlong,ZHANG Ting.Three-dimensional effects in low strain integrity test of PCC pile[J].Rock and Soil Mechanics,2007(6):1095-1102.
[11]罗文章.管桩在低应变瞬态集中荷载作用下的速度响应研究[D].北京:中国建筑科学研究院,2002.LUO Wenzhang.Velocity response study on pipe piles under low strain transient concentrated load[D].Beijing:China Academy of Building Research,2002.
[12]赵振东,杉本三千雄,铃木善雄.桩基低应变完整性检测的分析研究[J].地震工程与工程振动,1995,15(4):104-111.ZHAO Zhendong,SUGIMOTO Michio,SUZUKI Yoshio.Analytical study on low strain integrity testing for piles[J].Earthquake Engineering and Engineering Vibration,1995,15(4):104-111.
[13]Ding X M,Liu H L,Liu J Y,et al.Wave propagation in a pipe pile for low-strain integrity testing[J].Journal of Engineering Mechanics-ASCE,2011,137(9):598-609.
[14]Ding X M,Liu H L,Z B.High-frequency interference in low strain integrity testing of large-diameter pipe piles[J].Science China-Technological Sciences,2011,54(2):420-430.
[15]Ding X M,Liu H L,Chen Y M,et al.Analytical solution of wave propagation in large-diameter piles for low strain integrity testing[C]//Advances in Pile Foundations,Geosynthetics,Geoinvestigations,and Foundation Failure Analysis and Repairs-Proceedings of the 2011 Geo Hunan International Conference,2011,220(GSP):65-74.
[16]LIN Y,Sansalone M,Carino N J.Impact-echo response of concrete shafts[J].Geotech Test J,1991,14(2):121-37.
[17]Huang Y H,Ni S H,Lo K F,et al.Assessment of identifiable defect size in a drilled shaft using sonic echomethod:Numerical simulation[J].Computers and Geotechnics,2010(37):575-768.
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