摘要
等效剪切波速是确定场地类别进而得到地表设计地震动参数的重要依据之一,不同等效方法的可靠性对比研究对工程建设的地震安全意义非常。调整典型人造场地、274个实际工程场地计算深度内的剪切波速排列顺序,讨论走时等效剪切波速(vse)以及周期等效剪切波速(vs T)二者对不同土层结构场地的灵敏性;对比采用vse、vs T两种指标对收集整理的200多个场地的场地分类结果,讨论vse、vs T两者在场地分类方面的一致性;放缩各场地模型各土层剪切波速,直至vse达到分类临界值,计算各场地的vs T。结果表明,计算深度内土层结构改变,vs T随之改变,而vse固定不变,即vs T相对于vse更能灵敏的反映土层结构对地表地震动参数的影响;利用vse、vs T两个指标对实际工程场地的分类结果具有高度的一致性,vs T作为场地类别的划分指标具有一定的合理性和有效性;vs T的计算结果比vse偏大,当vse达到临界值时,vs T很好的呈现为正态分布,以此得到二者统计意义的转化值。
Equivalent shear wave velocity is one of the important parameters to determine the site category and further calculate the ground motion response spectrum. So detailed discuss the reliability of different equivalent methods has great meaning. After adjust the order of shear wave velocities of typical artificial sites and 274 actual engineering sites,we discussed the sensitivity of the travel time equivalent shear wave velocity（vse） and the period equivalent shear wave velocity（vs T） at different soil layer,respectively; and then compared their uniformity on site category with more than 200 sites. Scaling the shear wave velocities of each site model until vsereached the threshold values of site category,and calculated the vs Tof that site. The results show that,vs Tvaried but vsekeep steady when soil layer construction changed,it is mean vs Tis a more sensitive parameter to reflect the influence of soil layer construction on ground motion parameters. The site classification results of two methods have high consistency when application to the actual engineering sites,so it is reasonable and effective to adopt vs Tas the site classification index. The result of vs Tis larger than vse,vs Tshows normal distribution when vsereaches threshold values,so we can get their conversion value statistically.
作者
王竞
齐文浩
薄景山
蒋晓涵
WANG Jing;QI Wenhao;BO Jingshan;JIANG Xiaohan(Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;Earthquake Science Department, Institute of Disaster Prevention, Sanhe 065201, China)
出处
《地震工程与工程振动》
CSCD
北大核心
2018年第2期141-149,共9页
Earthquake Engineering and Engineering Dynamics
基金
国家自然科学基金项目(51508096
51408559)
中国地震局工程力学研究所基本科研业务费专项资助项目(2103C02)~~
关键词
场地分类
等效剪切波速
土层结构
走时等效
周期等效
site classification
equivalent shear wave velocity
soil layer construction
travel time equivalent
peri-od equivalent
