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.     

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。     

Merchants' attitudes to work in the Barcelona of the later Middle Ages: organisation of working space,distribution of time and scope of investments

The debate concerning the attitude to work of medieval and renaissance merchants has been one of the most intense in twentieth-century historiography. Arising from the publication of the classic works of the sociologist Max Weber, the debate entered the field of historiography proper after the appearance of articles by Werner Sombart and Henri Pirenne. In the 1950s and 1960s, the works of Yves Renouard and Armando Sapori centred discussion on the development of a specifically mercantile culture in the Italy of the Middle Ages and the Renaissance. In this historiographic context, the article below is an attempt to approach, through original sources, the figure of the merchant in late medieval Barcelona. These sources are inventories, wills, and marriage contracts, through which is offered a three-dimensional analysis of the professional culture of such a merchant; the concept of professional space; the organisation of time; and the bearings of his commercial and patrimonial investments. The result of this analysis is an attempt to reinterpret the decadence of Barcelona at the end of the fifteenth century through the notion of work entertained by those involved in commerce, attempting by this means to merge the consideration of economic and cultural matters. It is also a proposal for a model of analysis of professional categories, which on so many occasions have been left to one side because of the preponderance of more traditional questions such as those concerning society, economics or politics.     

近代以来新疆艺术述论(1840-1999)

本文把近代以来新疆艺术发展划分成三个阶段,对各艺术种类在不同时期的演变进行了概括性的研究,认为新疆艺术和中国政治社会变化密切相关,各阶段的新疆艺术既有其鲜明的时代烙印,也深刻地体现着其独具的传统特点;虽然新疆艺术受东、西方文化和艺术潮流的影响,但是此期中国内地艺术的影响深刻而全面。     

从“■”同“苟”说起

“苟”与“苟”本是两个形、音、义皆不同的字。由于隶定之后,字形相近,而“苟”字又在传世典籍中鲜有用例,故二字混而不别。“”本是“苟”的古文异体,亦被误认为是“苟”的异体,并因此由不同角度讹变出不同的字形。本文力图阐明“苟”、“苟”混而不别及相关异体产生的原因由来。     

程恩泽生卒年及中进士时间辨正

程恩泽是晚清著名学者,但对其生卒年和中进士时间各书记载不一,多有失误。有必要加以考证,辨析清楚,得出正确的结论。     

贵州北盘江流域先秦时期遗存分期与相关问题

本文通过对贵州北盘江流域先秦时期遗存的分析,依据文化面貌的差异将其分为三期,并结合周邻地区同时期材料的比对判定其年代。在此基础上,对它们所体现的葬俗、生计方式、居住形态和文化性质等方面进行探讨。     

An Analytical Study on the Seismic Vulnerability of Masonry Buildings in India

Two analytical models for unreinforced masonry (URM) buildings are proposed with the aim to simulate their seismic response and to estimate corresponding vulnerability functions. The proposed models are implemented in SAP 2000 nonlinear software to obtain capacity curve parameters for representative Indian URM buildings, based on a field survey and statistical analysis. Vulnerability functions are estimated using the obtained capacity curves. Damage Probability Matrices (DPMs) are obtained using the approximate PGA-intensity correlation relationship as per Indian seismic building code and are compared with the commonly used intensity scales and empirical damage data observed after the 2001 Bhuj earthquake.     

Dynamic Interaction between Rigid Foundations on Multi-layered Stratum

This article concerns the cross-interaction problem among multi-foundations on a linearly viscoelastic medium at very small shear strains. In the analysis, the foundations are discretized into a number of sub square-elements. The dynamic response within each sub-element is described by the Green’s function, which is obtained by the Fourier-Bessel transform and the precise integration method. Incorporating the displacement boundary condition and the force equilibrium of the foundations, it obtains the dynamic impedance and compliance functions of the foundations. Extensive results for two rigid circular foundations placed at different separations are presented. Parametric studies are carried out on the dynamic interaction among adjacent foundations. Illustrative results for several closely spaced foundations are also illustrated.     

The looting of the Iraq Museum: Thoughts on archaeology in a time of crisis

Abstract

The looting of the Iraq Museum has been widely proclaimed to be the worst cultural destruction since World War II; some have compared it to the decimation wrought by the Mongol invasion of Baghdad. Others have contended that the damage was wildly exaggerated. Any attempt at understanding the events surrounding the looting and destruction of the museum's collections must examine both what happened and how it was represented to a worldwide audience through the news media. I compare these events with the toppling of a statue of Saddam Hussein in Fardus Square and the burning of major libraries in Baghdad and suggest that their perceived significances for Western audiences stem in large measure from the extent and tone of press reporting. The long-standing coverage by major mainstream news media of Mesopotamian archaeology as foundational to Western civilization may be a prime reason why otherwise pro-(US) government reporting also included some critical coverage about the loss of the museum collections. Such circumstances challenge archaeologists to use media interest to convey more nuanced and ethically responsible views of archaeology to broader publics.