液化微倾场地群桩地震反应分析拟静力方法
Journal of Jilin University(Engineering and Technology Edition)(2022)
哈尔滨工业大学土木工程学院
Abstract
采用水-土动力耦合四节点等参单元,结合可准确描述砂土液化特性和累积剪切变形特性的多屈服面弹塑性本构模型,建立了液化微倾场地群桩-土动力相互作用有限元模型.随后,利用此模型计算获得正弦荷载作用下桩-土动力p-y曲线,以场地倾斜角度和埋深作为主控因素,对API规范计算公式中极限土阻力参数进行修正,提出修正系数.最后,基于非线性文克尔地基梁模型,提出液化微倾场地群桩-土相互作用拟静力方法,并通过有限元分析结果验证,拟静力方法的正确性和可靠性,据此研究桩模量、桩底连接刚度和桩径对桩基地震响应的影响规律.研究表明:随着桩基模量和桩底连接刚度的增加,桩侧向位移减小;保持桩基抗弯刚度不变,桩的弯矩和位移随着桩径增大而显著增加.
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