基于半无限单元的改进剪切质点系法及其应用  

Semi-infinite element-based modified shear mass point system method and its application

作　　者：邓亚虹[1,2] 夏唐代[3] 薛捷[1,2] 孙振峰[1,2] 

机构地区：[1]长安大学西部矿产资源与地质工程教育部重点实验室,陕西西安710054 [2]长安大学国土资源部岩土工程开放研究实验室,陕西西安710054 [3]浙江大学岩土工程研究所,浙江杭州310027

出　　处：《兰州理工大学学报》2015年第4期131-134,共4页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(41372327)

摘　　要：基于水平层状场地自振频率的一致质量剪切质点系法基本原理,考虑传统剪切质点系法刚性半空间假设对计算结果的影响.引入半无限单元,发展和建立可考虑半空间弹性的改进剪切质点系法.以改进剪切质点系法分析传统半空间刚性假设对场地自振频率计算结果的影响.分析表明,半空间刚性假设引起的计算误差随着剪模比、覆盖层厚度及半无限单元衰减系数的增大而减小.对于一般实际场地,在剪模比和覆盖层厚度不是很小的情况下,采用传统刚性假设剪切质点系法计算场地自振频率亦可获得比较满意的精度.Based on the principles of consistent mass shear mass point system＇ method for evaluation of natural frequency of horizontal layered soil site and taking account of the influence of rigid half space hypothesis on the evaluation, the semi-infinite element is introduced and a modified shear mass point system method incorporated with half space elastic is developed, established and used to analyzed the influence of traditional rigid assumption of half space on the site natural frequency. The analysis results show that the calculation error caused by rigid half space assumption will decrease with the increase of modulus ratio, soil thickness and attenuation factor of semi-infinite element. For common actual soil sites, if the covering layer thickness and modulus ratio are not very small, there will be a good calculation precision when traditional shear mass point system method incorporated with rigid half space is used.

关 键 词：层状场地 自振频率 剪切质点系法 弹性半空间 半无限单元 

分 类 号：TU352.12[建筑科学—结构工程] O328[理学—一般力学与力学基础]