预应力混凝土空心方桩承台节点抗震性能试验研究
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摘要
对预应力混凝土空心方桩-承台节点进行了6组足尺试件的拟静力试验,分别讨论轴压力、桩身配筋量、桩头嵌固深度和加载方向等4个因素对节点抗震性能的影响。研究表明:对于HKFZ400(210)桩型,在1 700kN及以上的轴压作用下,主要的破坏模式为近节点区桩身压弯破坏,破坏性质均为小偏心破坏;轴向荷载使得预应力混凝土空心方桩承台节点极限抗弯承载力增强,却削弱其变形能力,在1 700kN轴压作用下节点表现出了较好的变形能力;对角线加载方向是构件的静力弱方向,其极限承载力略低于正截面加载,但却有更大的变形能力;在50mm嵌固深度条件下,节点区没有发生锚固失效,反而表现出了更大的变形能力,但在破坏状态下的等效粘滞阻尼系数有所降低。
Quasi-static tests of six full-scale prestressed spun concrete square piles-cap connections were conducted to investigate the influence of 4 parameters on the seismic behavior of the connection.The results and findings indicate:①With axial load larger than 1 700 kN,failures governed by concrete compression take place in the connected part of the piles due to small eccentricity.②Axial load increases the loading capacity for the connection but on the other hand decreases its deformation capacity.The connection shows considerable deformation capacity under axial load of 1 700 kN.③Connection under diagonal loading condition is statically weaker,while showing better deformation capacity.④With a 50 mm dowel depth into the cap,the connection functions well and is capable of larger deformation.But the corresponding equivalent viscous damping coefficient is lower at failure.
Quasi-static tests of six full-scale prestressed spun concrete square piles-cap connections were conducted to investigate the influence of 4 parameters on the seismic behavior of the connection.The results and findings indicate:①With axial load larger than 1 700 kN,failures governed by concrete compression take place in the connected part of the piles due to small eccentricity.②Axial load increases the loading capacity for the connection but on the other hand decreases its deformation capacity.The connection shows considerable deformation capacity under axial load of 1 700 kN.③Connection under diagonal loading condition is statically weaker,while showing better deformation capacity.④With a 50 mm dowel depth into the cap,the connection functions well and is capable of larger deformation.But the corresponding equivalent viscous damping coefficient is lower at failure.
引文
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[3]王广宇.预应力混凝土空心方桩成套技术研究[D].北京:中国科学建筑研究院,2007.WANG Guang-yu.Researches on the Prestressed Spun Con-crete Square Pile Techniques[D].Beijing:China Academy ofBuilding Research,2007.
[4](JGJ94-2008)建筑桩基技术规范[S].北京:中国建筑工业出版社,2008.(JGJ94-2008)Technical Code for Building Pile Foundations[S].Beijing:China Architecture&Building Press,2008.
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[6]Charles W Roeder,Robert Graff,et al.Sesimic Performanceof Pile-Wharf Connection[J].Journal of Structural Engin-nering,2005,131(13):428-437.
[7]Pam Hoat Joen,Robert Park,et al.Simulated Sesimic LoadTests On Prestressed Concrete Piles and Pile-Pile Cap con-nections[J].Journal of the Precasted/Prestressed Concrete In-stitute,1990,35(6):42-61.
[8]中国建筑科学研究院.(JGJ101-96)建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.China Academy of Building Research.(JGJ101-96)Specifica-tion of Testing Methods for Earthquake Resistant Building[S].Beijing:China Architecture&Building Press,1997.
[9]刘晶波,杜修力.结构动力学[M].北京:机械工业出版社,2011.LIU Jing-bo,DU Xiu-li.Structure Dynamics[M].Beijing:China Machine Press,2011.
[10]周爱红,袁颖,侯征,等.桩—土—结构体系随机地震响应的实用计算方法及参数分析[J].西北地震学报,2011,33(1):51-55.ZHOU Ai-hong,YUAN Ying,HOU Zheng,et al.Paramet-ric Analysis and Practical Calculation Method for the Stochas-tic Seismic Response of Soil-Pile-Structure Interaction Sys-tem[J].Northwestern Seismological Journal,2011,33(1):51-55..
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