摘要
对数动态骨架本构以对数函数作为骨架曲线,引入“修正动骨架曲线”和“阻尼比退化系数”的概念,考虑试验阻尼对滞回曲线的影响,实现试验阻尼和滞回阻尼在数学上自洽的非线性动力本构。该本构只适用于一维土层场地时域非线性地震反应分析。基于对数动态骨架本构函数关系式,给出对数动态骨架参数的求解方法,并推导出加卸载曲线的时变切线剪切模量。通过ABAQUS软件的操作平台和等效剪应变算法,开发了基于对数动态骨架本构模型的显式子程序模块,该模型适用于二维和三维土层场地非线性地震反应分析。选取含软弱淤泥质土层场地作为计算模型,将从基岩输入不同加速度峰值的EI centro地震动的数值模拟结果进行对比,验证可考虑土体阻尼效应的对数动态骨架本构以及开发子程序的合理性和可用性。
The logarithmic dynamic skeleton constitutive model uses the logarithmic function as the skeleton curve and introduces the concepts of"modified dynamic skeleton curve"and"damping ratio degradation coefficient".Considering the influences of the test damping on the hysteresis curve,the nonlinear dynamic constitutive model for the test damping and hysteresis damping is realized.This constitutive method is only suitable for the nonlinear seismic response analysis of one-dimensional soil layers.In this study,based on the logarithmic dynamic skeleton constitutive function relation,the method of solving the logarithmic dynamic skeleton parameters is given,and the time-varying tangent shear modulus of the loading and unloading curve is derived.Based on the operating platform of ABAQUS software and the equivalent shear strain algorithm,a display subroutine module based on the logarithmic dynamic skeleton constitutive model is developed,which is suitable for nonlinear seismic response analysis of two-dimensional and three-dimensional soil layers.The numerical simulation results of the input EI centro ground motion with different acceleration peaks from bedrock are compared to verify the logarithmic dynamic skeleton constitutive model considering damping effects of soils and the rationality and availability of the developed subprogram.
作者
董青
陈苏
李小军
董云
陈亚东
周正华
朱俊
DONG Qing;CHEN Su;LI Xiaojun;DONG Yun;CHEN Yadong;ZHOU Zhenghua;ZHU Jun(Huaiyin Institute of Technology,Huaiyin 223003,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;College of Transportation Science&Engineering,Nanjing Tech University,Nanjing 210009,China)
出处
《岩土工程学报》
EI
CAS
北大核心
2025年第1期192-199,共8页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金青年基金项目(52408366)
国家自然科学基金重大项目(52192675)。
关键词
对数动骨架本构
阻尼比
场地地震反应
时变切线剪切模量
logarithmic dynamic skeleton constitutive model
damping ratio
site seismic response
time-varying tangent shear modulus
作者简介
董青(1992-),女,助理研究员,主要从事岩土力学方面研究工作。E-mail:2458810997@qq.com;通信作者:陈亚东(E-mail:354227312@qq.com)。
