【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。更多还原

【Abstract】 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.更多还原