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近期超大型、特种化、高精密等各类新型设备不断涌现,给国内现行《动规》中依赖经验参数的简化分析法提出了重要挑战与难题。基于ABAQUS有限元法,给出了本构、接触面、边界等选取方法;以弹性半空间理论建立的国际规范法和质-阻-弹模型建立的国内规范法为参考,对底面直径6 m圆形、6 m×6 m方形明置基础建立模型,分别施加简单正弦荷载、耦合正弦荷载进行计算。对比结果发现:有限元法与国际规范法的计算结果基本一致,互相印证了其可行性,而国内规范法计算结果与两者有一定差异。国际规范法的运动耦合模型相比更为科学,但计算过程复杂;国内规范法的运动耦合模型较为简化,计算刚度、固有频率相比偏大;有限元法能考虑复杂耦合运动、土体参振质量等,并可求解周围土变形分布与规律。
Abstract：Recently, various new types of equipment such as ultra-large, specialization and high-precision have emerged, which put forward important challenges and problems for the simplified analysis method relying on empirical parameters in design of dynamic machine foundation. The selection methods of constitutive, contact surface and boundary are given in this paper which is based on the ABAQUS finite element method. Using the international code based on elastic-half-spring theory and the domestic code based on the mass-dashpot-spring theory as references, modeling a 6 m circular and a 6 m×6 m square surface foundation, applying with sinusoidal loads and couple sinusoidal loads, the dynamic foundations response has been calculated. The results show that the calculation results of finite element method are consistent with the calculation results of the international code, which confirms the feasibility of each other. The calculation results of domestic code are quite different from the others. The simplified coupling model of the international code is more scientific, but the calculation process is complicated. The motion coupling model of domestic code is simplified, and the calculation stiffness and natural frequency are larger. The finite element method can consider complexity of coupling condition and vibration of the soil. Moreover, response of surrounding soil can be evaluated.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2020.06.015
中图分类号:TU435
引用信息:
[1]吴天亮,王永志,洪财滨,等.两种明置基础条件下ABAQUS动力基础响应分析可行性探讨[J],2020,51(06):128-137.DOI:10.13928/j.cnki.wrahe.2020.06.015.
基金信息:
中国地震局工程力学研究所基本科研业务费专项项目(2019EEEVL0203,2017B05);; 国家自然科学基金项目(51609218);; 黑龙江省自然科学基金资助项目(YQ2019E035)