Modification of Dynamic Foundation Response Due to Soil-Structure Interaction

This paper presents the results from extensive parametric dynamic analyses of soil-structure systems that focus on the clear modification (increase or decrease) of the acceleration amplitude at the foundation with respect to the free-field, especially for squatty structures. Properties of the systems are selected such as to cover a wide range of meaningful geometries and materials for engineering practice. The results are presented in terms of weighted modification factors of the maximum foundation acceleration amplitude with reference to the corresponding maximum acceleration amplitude at free-field, for squatty and more slender structures. For the large majority of the studied systems, foundation acceleration decreases from the free-field by 10–15% on average. Nevertheless, acceleration demand at the foundation increases compared to the free-field, for 30% of squatty and for 15% of the more slender structures. Modification of the foundation acceleration amplitude is also correlated with the ratio of the predominant period of the input motion to the flexible-base system period. Finally, the findings of this study are compared with sparse available recorded data from the Seismic Hazard Harmonization in Europe database.     

An Investigation of the Ground Motion Scaling Procedures for the Nonlinear Seismic Analyses of Concrete Gravity Dams

Seismic assessment of gravity dams is generally carried out using time history analyses. Scaling of the motions is commonly used; however, in contrast to buildings, the performance of scaling procedures at predicting the mean and reducing the dispersion in engineering demand parameters (EDPs) is not known. The main goal of this study is to assess the performance of different scaling procedures in predicting seismic demands on dams. The performance regarding the prediction of the damage and the required number of motions for effective analysis was investigated. The results show that techniques commonly used for moment frames should not readily be applied to these structures.     

宝鸡眉县出土27件窑藏青铜器锈蚀特征及成分的分析研究

为了研究刚出土的青铜器在新的环境中的发展变化情况,在宝鸡眉县27件国宝级西周窖藏青铜器出土一年半后,对这批器物出土前后的锈蚀类型及特征进行了分析和描述,并对每一器物的锈蚀产物进行了系统检测分析。结果显示,这批青铜器腐蚀类型主要为封闭环境中的大气腐蚀,主要产物为碳酸盐和氧化物。但同时在其中一个器物上发现了氯化物类有害锈成分,分析认为,出土前后环境的变化是有害锈得以产生和发展的根本原因。     

从《方言疏证》看戴震的校勘特点

作为一代考据学大师,戴震将其考据方法运用于校勘,他校勘《方言》较少依据版本,而是博综群籍传注,本之小学六书,以理论断;以求是为根本旨归,大胆改正讹文;发凡起例,首次从致讹角度总结误例。戴震的校勘体现出鲜明的时代学术风尚。     

Use of ground penetrating radar to map subsurface archaeological features in an urban area

The ground penetrating radar (GPR) technique was used to investigate the subsurface in an urban area located in Mesagne (Italy) to obtain a map of the archaeological features in the ground. The GPR survey was undertaken at selected locations placed near (about 50 m) to a necropolis dating from the Messapian to the Roman imperial age, using a GSSI Sir System 2 incorporating 200 and 500 MHz centre frequency antennae. The selected areas (A and B) were surveyed along parallel 1 m spaced profiles using a 200 MHz antenna in area A and along parallel 0.5 m spaced profiles using a 500 MHz antenna in area B. For the selected areas the processed data were visualised in 3D space not only by means of the standard time slice technique, but also by means of a recently proposed approach, namely by iso-amplitude surfaces of the complex trace amplitude. The immediacy in revealing the spatial positioning of highly reflecting bodies, such as the anomaly interpreted as an old hypogeum room in area A, makes 3D visualisation techniques very attractive in archaeological applications of GPR. Their sensitivity to the signal/noise ratio is, on the other hand, highlighted by the quite poor performance in area B, where the only reliable result provided by all the techniques was the ancient living surface reflection, whereas none of them could effectively enhance the visibility of weak hyperbola reflections noted on 2D sections and probably related to the walls located on the ancient living surface. The performance of the various techniques in these two different situations allowed insights into their main advantages and drawbacks to be gained.     

古代治边观念的研究内容与主要特点

本文对古代治边观念的研究内容和主要特点进行了探讨。认为古代治边观念是中国古代逐步形成的关于边疆、历史疆域形成与管辖及相关问题的处理,在态度、方略和措施方面的一系列认识。其研究内容十分丰富,大体上包括古代边疆观、古代治边观以及对其他边疆有关问题的认识观三个主要方面。治边观念的特点主要有对历代边疆施治产生了深刻影响;与国势兴衰相关联;中原王朝与边疆政权的治边观念有一定差异;经历了发展演变的过程。     

战国秦汉西南边疆思想的区域性特征初探

文章主要对战国秦汉时期西南边疆思想的区域性特征进行了探讨,认为西南边疆开发的战略思想、经济思想和人才思想均表现出有别于其他地区的区域特征。在战国秦汉时期边疆开拓的战略思想和整体布局中,西南边疆虽然处于从属地位,开发实践中表现出一定的应急性和随意性,但开发成就显著,这与西南边疆开发策略思想的正确和实施的有效性有密切关系。北南向协济的区域经济思想和以西南本土籍巴蜀人治理西南边疆的人才思想指导下所确定的开发方略和治边措施,就是充分依托战国以来200余年西南北部巴蜀的开发成就和资源,进行西南南部边疆的开发和治理。     

博物馆文物的防震保护研究（三）——陈列文物的地震安全性分析

通过分析博物馆馆藏文物的悬吊、固定、浮放等基本放置形式,探讨了文物的陈列特征及其可能造成的震害因素。综合考察和分析研究了国内外浮放式物体及陈列文物的运动状态,指出陈列文物在地震发生时的主要危害性运动是滑移和倾覆。根据相关浮放物在地震作用下的计算方法、上海博物馆文物的陈列特征及防震设计参数,提出简便实用的浮放式陈列文物稳定性计算模型,编制了适合上海博物馆文物安全性分析的计算程序。并以上海博物馆文物陈列的3类接触材料、4楼中国古代玉器馆的典型陈列文物为试点,计算了陈列文物在地震中遭受破坏的临界值。表明在设防水准的大震和中震情况下,目前陈列现状的绝大多数文物均存在倾覆和滑移安全隐患,但当文物所受到的地震动减小到110gal时可满足陈列安全。     

Integrating pedological and geophysical methods to enhance the informative value of an archaeological prospection – The example of a Roman villa rustica near Regensburg,Germany

Geophysical prospection techniques are widely used to visualize the buried past. Various methods such as magnetometry, electric resistance mapping and electric resistivity tomography and ground penetrating radar yield different results. The use of all three techniques in combination with aerial photography interpretation and pedological mapping is highly effective, but it requires a multi-layer approach. This paper presents such a multi-layer approach carried out at a site with buried remnants of a Roman villa rustica in southern Germany. The integration of the various results into a geographical information system leads to a geocodation of all outcomes and a final archaeological interpretation. Several buildings in different states of preservation, different kinds of ground floors both with and without hypocausts, perimeter walls and kilns could all be detected. The soil mapping results helped in the geophysical interpretation by outsourcing soil erosion and accumulation areas. It is shown that none of the employed methods could have supplied all the compiled information on their own, and the strengths and weaknesses of each method is discussed in order to point out the implications for archaeologists.     

磨制石器类型学的分类原则与术语界定——以大辛庄商代石器为例

<正>对事物的分类是古代人类社会文化生活中的一种重要的比较自觉的行为和客观现象,人们在从事生产和生活时都会根据自己的标准进行自觉的分类活动。当然这些标准产生于特定的文化社会背景和思想意识,这就给我们今天的探寻以实际上有效的线索。所以考古研究中的器物分类是我们研究和复原古代文化的一条重