基于动力子结构方法的场地地震反应分析方法
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摘要
本文验证了将约束子结构法引入到复杂场地地震反应分析的可行性,并在此基础上提出了两种进一步提高计算效率的简化措施。结合土层有限元模型的自身特点,提出了标准子结构的概念,通过设置标准子结构,可减少相同子结构的重复计算。基于约束子结构本身的性质,假定土层计算区域为局部非线性,可简化等效线性化分析过程,通过数值试验给出了局部非线性区域的取值范围。算例表明,上述简化措施在提高大规模复杂场地地震反应分析计算效率方面具有显著的优势。
In this paper we proposed a method of utilizing restrained mode synthesis method to analyze the seismic response of the large-scale complicated soil site. Our results show that the suggested method is practicable. Two simplified measures of the restrained mode synthesis method are presented to enhance computational efficiency. The concept of standard substructure is proposed with the consideration of soil layer property of finite element model. Repetitive computation is avoided by the proposed method of the standard substructure. Based on the property of restrained substructure and the assumption of the local nonlinear characteristic of large-scale complicated soil site, the equivalent linear method to analyze the seismic response of the soil site is simplified. The local nonlinear area in the large-scale soil site is determinated based on numerical experimentation. The results of numerical examples show that the improved method may increase the computational efficiency of seismic response analysis of the large-scale complicated site.
In this paper we proposed a method of utilizing restrained mode synthesis method to analyze the seismic response of the large-scale complicated soil site. Our results show that the suggested method is practicable. Two simplified measures of the restrained mode synthesis method are presented to enhance computational efficiency. The concept of standard substructure is proposed with the consideration of soil layer property of finite element model. Repetitive computation is avoided by the proposed method of the standard substructure. Based on the property of restrained substructure and the assumption of the local nonlinear characteristic of large-scale complicated soil site, the equivalent linear method to analyze the seismic response of the soil site is simplified. The local nonlinear area in the large-scale soil site is determinated based on numerical experimentation. The results of numerical examples show that the improved method may increase the computational efficiency of seismic response analysis of the large-scale complicated site.
引文
白建方,楼梦麟,2007.苏通大桥南引桥场地土层地震反应的数值分析.震灾防御技术,2(2):176—186.
胡聿贤,1988.地震工程学.北京:地震出版社.
胡海昌,1987.多自由度结构的固有振动理论.北京:中国科学出版社.
楼梦麟,林皋,1986.粘弹性地基中人工边界的波动反射效应.水利学报,6 期:20—30.
楼梦麟,1997.结构动力分析的子结构方法.上海:同济大学出版社.
楼梦麟,潘旦光,范立础,2003.土层地震反应分析中侧向人工边界的影响.同济大学学报(自然科学版),31(7):757—761.
楼梦麟,李遇春,李南生,2006.深覆盖土层地震反应分析中的若干问题.同济大学学报(自然科学版),34(4):427—432.
王文亮,杜作润,1985.结构振动与动态子结构方法.上海:复旦大学出版社.
谢定义,1988.土动力学.西安:西安交通大学出版社.
Wolf J.P., 1985. Dynamic Soil-Structure Interaction. Englewood Cliffs, Inc., Pretice-Hall, New Jersey.
胡聿贤,1988.地震工程学.北京:地震出版社.
胡海昌,1987.多自由度结构的固有振动理论.北京:中国科学出版社.
楼梦麟,林皋,1986.粘弹性地基中人工边界的波动反射效应.水利学报,6 期:20—30.
楼梦麟,1997.结构动力分析的子结构方法.上海:同济大学出版社.
楼梦麟,潘旦光,范立础,2003.土层地震反应分析中侧向人工边界的影响.同济大学学报(自然科学版),31(7):757—761.
楼梦麟,李遇春,李南生,2006.深覆盖土层地震反应分析中的若干问题.同济大学学报(自然科学版),34(4):427—432.
王文亮,杜作润,1985.结构振动与动态子结构方法.上海:复旦大学出版社.
谢定义,1988.土动力学.西安:西安交通大学出版社.
Wolf J.P., 1985. Dynamic Soil-Structure Interaction. Englewood Cliffs, Inc., Pretice-Hall, New Jersey.
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