基于Davidenkov骨架曲线模型的修正不规则加卸载准则与等效剪应变算法及其验证

发布时间：2018-01-24 03:50

  本文关键词： 修正不规则加卸载准则 Davidenkov本构模型 等效剪应变算法 场地地震效应 非线性　出处：《岩土工程学报》2017年05期 　论文类型：期刊论文

【摘要】：非等幅循环荷载作用下,采用"扩展Masing"法则修正应力 应变滞回曲线时,程序的实现过程中需要预留大量的状态变量。针对该问题,提出了Davidenkov本构模型的不规则加卸载修正准则,以代替"扩展Masing"法则中的"上大圈"准则。通过等效剪应变算法的比选,给出了加卸载判据简单且精度更高的等效剪应变算法。基于ABAQUS软件的显式模块,开发了基于不规则加卸载准则的修正Davidenkov本构模型的显式子程序模块,适用于大规模二维和三维场地非线性地震效应分析。选取Mississippi湾500 m深的钻孔作为计算模型,通过与一维场地非线性地震效应分析专业程序Deepsoil计算得到的输入不同强度地震动下的地表峰值加速度、PGA=0.65g的场地地震反应的对比分析,佐证了提出的Davidenkov本构模型不规则加卸载准则与等效剪应变算法的合理性。
[Abstract]:When the normal stress and strain hysteretic curve is revised by "extended Masing" rule under the action of non-constant amplitude cyclic load, a large number of state variables need to be reserved in the process of implementation of the program. To solve this problem, a large number of state variables need to be reserved. In this paper, the irregular loading and unloading correction criterion of Davidenkov constitutive model is proposed to replace the "upper large cycle" criterion of "extended Masing" rule. The equivalent shear strain algorithm with simple loading and unloading criterion and higher precision is presented. The explicit module based on ABAQUS software is presented. The explicit subroutine module of modified Davidenkov constitutive model based on irregular loading and unloading criterion is developed. It is suitable for large scale 2D and 3D site nonlinear seismic effect analysis. A 500m deep borehole in Mississippi Bay is selected as the calculation model. The peak acceleration of ground surface under different intensity ground motion is calculated by using Deepsoil program which is a professional program for nonlinear seismic effect analysis of one-dimensional site. The comparative analysis of PGA=0.65g 's site seismic response proves the rationality of the proposed Davidenkov constitutive model for irregular loading and unloading criteria and equivalent shear strain algorithm.
【作者单位】： 南京工业大学岩土工程研究所;江苏省土木工程防震技术研究中心;
【基金】：国家自然科学基金项目(51378258,51438004) 国家科技重大专项项目(2013ZX06002001-9) 国家青年自然科学基金项目(51508271) 江苏省青年自然科学基金项目(BK20150958)
【分类号】：TU435
【正文快照】： 在场地非线性地震反应计算中,核心问题在于选择合适的土体非线性本构模型及其合理的数值模拟实现方法。大量试验研究表明,采用三参数的*通讯作者(E-mail:gxc6307@163.com)Davidenkov本构模型能较为理想地描述各类土体的非线性动力特性,累积的试验资料非常丰富[1-3]。由于地震，

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