采用Monte Carlo模拟手段，提出描述场地土层特性变异性对传递函数变异性影响的分析方法。选取日本Kik-Net强震数据库中软（FKSH14）、硬（FKSH12）两类场地，建立场地概率模型。应用Monte Carlo技术随机生成50组场地剖面，分别计算场地的传递函数STF及STF标准差，讨论场地土层厚度、剪切波速，以及二者组合情况下场地传递函数的标准差及场地特征频率的变化。结果显示：对于硬土场地而言，场地特征频率标准差相对于软土场地较大，且剪切波速变异性影响比土层厚度变异性的影响略大，而二者组合工况下最大；而软土场地，土层厚度、剪切波速变化工况下场地特征频率的标准差相当，比二者组合工况下略低；软、硬两类场地，土层厚度与剪切波速二者组合工况下 STF 的标准差比单一量变化情况下略大，但3种工况下场地STF标准差相差不明显；场地STF的标准差在场地自振频率附近的频率段取值较大，极值点与场地STF的极值点相对应。

Adopting Monte Carlo simulation technique, a method for describing the variability of site transfer function (STF) with respect to the variability of site characteristic parameters is proposed. Two Kik-Net seismic strong-motion stations, which were installed on hard ground (FKSH12) and soft site (FKSH14) in Japan, were selected and corresponding probability site models were established. 50 site soil profiles were randomly generated for hard ground and soft site via Monte Carlo simulation;and then the STFs were calculated as well their standard deviations, respectively. The standard deviations of STFs and the site characteristic frequencies were discussed in three cases, i.e. varying subsoil thicknesses (case I), varying subsoil shear wave velocities (case II), and varying subsoil thickness and shear wave velocities (case III). The results show that:the standard deviations of site characteristic frequencies of hard ground is overall larger than those of soft site;the standard deviation

解释了场地环境设计的含义，阐述了场地和环境包含的两个不同层面的问题———场地的图形和场地的环境特质，并结合实例，分析了建筑的场地环境对方案设计的影响，以供参考。

The paper interprets the definition of field environment design, and describes two field and environment problems———field shape and field environment features. Combining with examples, it analyzes the impact of building field environment upon the scheme design, with a view to provide some guidance.

通过对2011年新西兰发生的6.3级地震中获取的硬土场地、软土场地和液化场地强震记录实测资料进行分析，研究包括3种类型场地的地震动特征及其相互关系。分析的强震记录为震中距小于50 km，且峰值大于0.05g 的23个场地上的加速度记录，其中含3个硬场地、11个软场地和9个液化场地。3种类型场地上的放大系数谱对比分析表明，硬土场地、软土场地和液化场地上的地震动特征具有明显区别，三者层次清晰，差别显著，从地震动表现上液化场地已构成一个与常规场地并列的独立单元；液化场地减少地震动高频分量但同时对低频分量显著放大，与非液化场地相比，液化场地可使其上短周期结构反应减小一半，但同时可使其上长周期结构反应放大2.5～5.0倍；土层的液化对此次地震中克莱斯特彻奇市中心 CTV大楼的破坏应有很大影响，大楼自振周期约为0.7 s，地震中土层液化使场地加速度反应谱卓越周期由0.1～0.3 s 增到0.5～1.0 s，与大楼的自振周期趋于吻合，加重了大楼震害。以此为鉴，按现有规范中地震动的设计方法，如遇液化场地将对长周期结构给出明显危险的结果，因此从振动角度今后进行结构抗震设计时，可液化场地上的地震动应给予特殊考虑。

By analyzing the records from stiff sites, soft sites and liquefied sites in 2011 Ms 6.3 New Zealand earthquake, the characteristics and relationship of ground motion on 3 types of sites including the liquefied sites are investigated. The seismic acceleration records at 23 seismic stations whose epicenter distances are less than 50 km and PGA great than 0.05g are collected, in which 3 stiff sites, 11 soft sites and 9 liquefied sites are included. The comparison results of amplification coefficient spectra from 3 types of sites indicate that there are obvious distinction among the stiff sites, soft sites and liquefied sites. From the view of ground motion, the liquefied sites can become an independent type. On the liquefied sites the high frequency component of ground motion decreases and meanwhile the low frequency component significantly amplifies. Compared with non-liquefied sites, the response of the short period structure on the liquefied sites will be reduced by half; bu

在常规的场地地震响应有效应力分析法中,通常只考虑Gmax随有效应力和孔隙比的变化,而最新的试验研究表明,Gmax在大应变幅振动下存在附加衰减。收集了不同类型土体在大幅振动下的298组Gmax数据,拟合并给出了对应于两种Gmax附加衰减模式的计算模型,通过编制可考虑Gmax附加衰减影响的一维场地地震响应有效应力分析程序,分别对典型场地和离心机振动台模型场地的地震响应进行分析对比。结果表明:Gmax附加衰减对场地加速度和剪应力响应均有较大影响,将加速场地液化进程和扩大场地最终液化范围;考虑Gmax附加衰减可较好地模拟动力离心模型试验场地动力响应;但在强震情况下,场地迅速液化,Gmax附加衰减对场地动力响应的影响反而减弱。

In the conventional effective stress method of site seismic response analysis, the changes of small strain shear modulus Gmax are only with the effective stress and void ratio. While the latest experimental studies show that under large amplitude vibration, there exists additional attenuation of Gmax. 298 groups of Gmax data of different types of soil under large amplitude vibration are collected and analyzed, based on which the computational equations corresponding to two additional attenuation modes of Gmax are provided. A one-dimensional site seismic response analytical program has been compiled based on effective stress principle, to account for the influence of additional attenuation of Gmax. A typical example and a dynamic centrifuge model test of sand field are separately simulated using the compiled program. It turns out that, the additional attenuation of Gmax has influence on both the response of accelerations and shear stresses. Besides, it can speed up the liquefaction of s

在地震多发的中国内陆环境下,场地稳定性评价越来越引起重视。为了研究北京延庆新城规划区大型场地动力响应特征,在分析延庆新城规划区第四纪覆盖层和断裂的空间分布规律基础上,基于数值模拟方法,运用有限差分数值模拟软件FLAC3D建立了规划区三维仿真模型,并对新城规划区场地动力响应进行了仿真,最后通过定义场地速度响应系数来刻画场地动力响应特征。结果表明：对于＂土岩组合＂的典型场地,在低频剪切波的激励下,第四纪覆盖层的厚度将引起不同程度的场地速度响应,第四纪覆盖层越厚,场地速度响应系数越大,动力放大程度越高;对于下伏断裂的复杂场地,剪切波传播路径变得极其复杂,断裂对地表速度响应系数有放大作用,放大程度与断裂分布形式和发展规模有关。

In the earthquake prone inland environment of China,the evaluation of site stability has drawn more and more attention.For the study of large site dynamic response characteristics of Yanqing new city planning region,this paper firstly found out the Quaternary overburden layer and the spatial distribution of fractures in Yanqing new city planning region;secondly,it established a 3D simulation model for planning region using FLAC3D based on numerical simulation;thirdly,it made a simulation of the site dynamic response in planning region;and lastly,it described the characteristics of site dynamic response by defining the coefficient of site speed response.The results reveal the following aspects:in the typical sites of soil-rock composite,different thicknesses of the Quaternary overburden layer could lead to different levels of site speed response under the low-frequency shear-wave excitation,and while the Quaternary overburden layer gets thicker,the coefficient of site speed re