劲性搅拌桩复合地基的抗震性能
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摘要
针对劲性搅拌桩复合地基的抗震性能,以ANSYS为工具,考虑桩土上部结构之间的相互作用,对劲性搅拌桩单桩复合地基在不同地震波作用下的响应进行了时程分析;对比了该复合地基与桩基础地震响应的差异,并对影响该复合地基抗震性能的因素进行了研究。结果表明:地震波作用下劲性搅拌桩复合地基单桩的最大弯矩出现在距桩顶0.2L~0.4L处;芯桩越长、面积置换率越大,最大弯矩越大;桩身最大弯矩、剪力、内外芯桩身应力比及上部结构水平位移等与地震波波型有很大关系。在相同地震波作用下,面积置换率对桩身弯矩、剪力的影响最大,而芯桩长度和水泥土模量对桩身弯矩和剪力的影响很小。
To understand the seismic behavior of a compound foundation with concrete core mixing pile,the seismic responses in time domain were analyzed under the consideration of the interaction among pile-soil-superstructure through the 3-D finite element method by using the ANSYS software.The difference in seismic responses between a compound foundation of concrete core mixing pile and a pile foundation were analyzed.Some parameters influencing anti-seismic behavior of a compound foundation of concrete core mixing pile were studied.The results showed that the maximum moment of concrete core mixing pile lay in(0.2～0.4)L;the greater the concrete core pile,the greater the area replacing ratio and the bigger the largest moment;and the type of seism wave affected the maximum moment,sheer,pile-soil stress ratio and displacement of the top of the pile under the same seismic response to great degree.The influencing extent of area replacing ratio was greater than that of concrete core pile on moment and shear.
To understand the seismic behavior of a compound foundation with concrete core mixing pile,the seismic responses in time domain were analyzed under the consideration of the interaction among pile-soil-superstructure through the 3-D finite element method by using the ANSYS software.The difference in seismic responses between a compound foundation of concrete core mixing pile and a pile foundation were analyzed.Some parameters influencing anti-seismic behavior of a compound foundation of concrete core mixing pile were studied.The results showed that the maximum moment of concrete core mixing pile lay in(0.2～0.4)L;the greater the concrete core pile,the greater the area replacing ratio and the bigger the largest moment;and the type of seism wave affected the maximum moment,sheer,pile-soil stress ratio and displacement of the top of the pile under the same seismic response to great degree.The influencing extent of area replacing ratio was greater than that of concrete core pile on moment and shear.
引文
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[15]宋二祥.无限地基数值模拟的传输边界[J].工程力学,1997(增刊):613 619
[2]白晓红,葛忻声,解秀娟.两种桩体材料复合地基性状的对比研究[J].岩土力学,1997,9(3):75 81
[3]龚晓南.复合地基[M].杭州:浙江大学出版社,1992.3 4
[4]孔峻清,马海燕.刚性桩复合地基的原理与应用[J].安徽建筑,2001(1):53 54
[5]池跃君,宋二祥,陈肇元.刚性桩复合地基竖向承载力特性分析[J].工程力学,2003,20(4):9 14
[6]池跃君,宋二祥,陈肇元.性桩复合地基在不同荷载下的桩土分担特征[J].天津大学学报,2003,36(3):359363
[7]池跃君,宋二祥,陈肇元.刚性桩复合地基沉降计算方法的探讨及应用[J].土木工程学报,2003,36(11):1923
[8]张明,温立新,赵正军.刚性桩复合地基的设计及承载力评价[J].岩土工程技术,2001(1):21 24
[9]池跃君,宋二祥,高文新,等.刚性桩复合地基承载及变形特性试验研究[J].中国矿业大学学报,2002,31(3):237 241
[10]王立忠,柯瀚,陈云敏,等.地震荷载作用下水泥土搅拌桩的动力分析[J].振动工程学报,1998,11(4):416423
[11]刘宗贤,李玉亭.单桩基础在无限层地基中的横向地震反应分析[J].四川地震,1994(3):32 44
[12]徐自国,宋二祥.刚性桩复合地基抗震性能的有限元分析[J].岩土力学,2004,25(2):179 184
[13]Wu Guoxi,Liam Finn WD.Dynamic nonlinear of pilefoundations usingfinite element inthe ti me domain[J].Canadian Geotechnical Journal,1997,34:44 52
[14]王松涛,曹资.现代抗震设计方法[M].北京:中国建筑工业出版社,1997.117 127
[15]宋二祥.无限地基数值模拟的传输边界[J].工程力学,1997(增刊):613 619
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