Earthquake Faulting Effects on Buried Pipelines – Case History and Centrifuge Study

Permanent ground deformation (PGD) is one of the most damaging hazards for continuous buried lifelines. This hazard is especially severe when the PGD results in net compression in the pipe. In that case, buckling of pipe material can occur. If buckling is moderate, deformation of the pipe cross-section can lead to flow restriction and high friction losses, and eventually require line replacement. If buckling is severe, high localized strains can lead to pipe rupture, loss of contents, and possible pollution of surrounding soil. In this article, centrifuge tests of buried pipelines subject to abrupt ground failure in the form of surface faulting are presented. The fault movement results in mostly compression in the pipe. The test results are compared with a case history of pipe failure in the 1999 Izmit, Turkey earthquake and also with the results from the centrifuge tests which result in net tension in the pipe. The experimental setup, procedures, and instrumentation are described in detail. Suggestions for design practice are offered based on the analysis of results from both the 1999 Izmit case history and the centrifuge modeling.     

A Method for Selecting Ground Motions that Considers Target Response Spectrum Mean and Variance as Well as Correlation Structure

This study proposes a method for selecting ground motions from a ground motion library with response spectra that match the target response spectrum mean, variance, and correlation structures. The proposed method is conceptually simple and straightforward. In this method, a desired number of ground motions are sequentially selected from first to last. The accuracy and consistency of the proposed method are verified through comparisons of the ground motions selected using the proposed method with those selected using conventional methods. This study shows that the seismic responses of the frames vary according to ground motion selection and correlation structures.     

Analytical Seismic Assessment of a Tall Long-Span Curved Reinforced-Concrete Bridge. Part II: Structural Response

The seismic assessment of special bridges, even under the hypothesis of full knowledge of site conditions, structural characteristics, and seismic activity at their location, is not an easy and straightforward task due to the complexities and uncertainties related to the finite-element modeling approaches, structural loading scenarios, and seismic analysis methodologies. In this article, a series of nonlinear static and dynamic finite-element analyses on the Mogollon Rim Viaduct are performed with consideration of both uniform and conditionally simulated non-uniform seismic motions. The failure modes of the bridge using different numerical modeling approaches are discussed, and the degree of sensitivity of its response to the different seismic assessment strategies is evaluated. The effect of the multi-component, multi-support and multi-directional excitations of ground motions on the design and response are studied, and the pros and cons of the commonly used structural analysis methodologies of bridges are also addressed. The numerical results of the present study provide a deeper insight into the nonlinear behavior of curved reinforced-concrete bridges, and suggest practice-oriented approaches for their seismic assessment.     

视觉文化背景下博物馆展示价值定位——自然博物馆陈列的新体悟

博物馆展示艺术是一种诉诸视觉器官的文化形态。为观众提供可欣赏、受教育的展示精品,是博物馆追求的永恒主题。本文通过对博物馆展示主题、创意设计、科技维新及视觉艺术四方面进行思考,发掘博物馆自身所蕴藏的艺术价值和文化价值是当代视觉文化背景下展示艺术的价值定位。     

平安故宫 千秋大计——故宫博物院“平安故宫”工程概述

故宫博物院《“平安故宫”工程总体方案》于2013年3月正式上报国务院.4月,“平安故宫”工程被批准立项,成为重大文化建设工程.该工程旨在全面提升故宫博物院的文化遗产保护、展示传播和观众服务能力,实现对故宫的完整保护和故宫博物院的可持续发展.其主要内容包括北院区建设、地库改造、基础设施改造、防震、修复等七大项.     

Railway development as Symbolising ideas of social construction: (With Special Reference to Railway Development in Australia)

The townscape of “old” Lerwick reflects its traditional focus on the sea for its economic base. The major elements in this cohesive visual character are the closely clustered houses in the steep hillside district of the Lanes, the narrow, winding principal commercial street, and the lodberries projecting out into the harbour. The latter were constructed to meet the needs of the prosperous expanding trade period of the latter half of the 18th century and first half of the 19th century. Harbour improvements in the final quarter‐century of the 1800s ended their commercial usefulness. After a century of declining use and of neglect they are being restored as part of the renewal of “old town” Lerwick.     

The Politics of Sources Meets the Practices of the Librarian: An Interview with Esther Chen**

[I] want to single out one phenomenon that could be called the ‘politics of sources’. It points to the extent to which the histories that both scientists and historians can write are artifacts of the available sources. The Rockefeller Foundation not only opened its archives very early on for historical work but also invested a lot in making the archives readily available for historical exploration. During the 1980s, many young historians took advantage of this opportunity. Thus, in a relatively early phase of the professional historiography of molecular biology, one could have gained the impression that the development of the new biology as a whole was a bio-politically directed enterprise of the Rockefeller Foundation sustained by the vision that social processes could ultimately be controlled by biological processes.     

The Spanish telephone sector (1876-1924): A case of technological backwardness

This article explains the often neglected history of the Spanish telephone sector. Its main purpose is to examine the factors that determined the technological choices that were made in this sector, and to describe and analyze the growth of telephone networks in Spain and the rest of Europe between 1876 and 1924, a period marked by the internationalization of technology. It concludes that a complex range of factors, varying in their specific importance over the period, determined the pattern of technological diffusion in this sector. In the period dominated by Bell's patents, the sector was characterized by a high degree of technological homogeneity. However, once the licenses on these patents expired, a greater variety of technological devices were adopted in the sector, although this variety was limited by the control that the larger firms wielded over the market and policies of international cooperation. Spain, unable to keep pace with technological developments elsewhere in Europe, failed to establish its own national industry of telephone materials and equipment.     

Interpreting the Moon Landings: Project Apollo and the Historians

By focusing on the key book‐length studies of the Apollo program that landed American astronauts on the Moon in the 1960s and 1970s, this essay seeks to evaluate the historiography about Apollo in the first decade of the twenty‐first century, dividing the subject into five major areas. The first area is the foreign policy and public policy antecedents of Apollo and its immediate ramifications; some of these efforts have yielded significant studies. The second area involves the evolution of space hardware, in many instances these are overwhelmingly detailed studies of rockets and other space flight technologies. Third, there is a great fascination with the astronauts and their actual flights, and a rich tradition of memoir and narrative exists in this arena. The fourth area receiving attention from historians of Apollo and the lunar voyages emphasizes the history of science, in which much of the focus is on the scientists, scientific findings from the voyages of discovery, and the use of this evidence in developing larger theories about the origin and evolution of the solar system. Finally, and increasingly so in the last 20 years, the Apollo story has been recontextualized through social and cultural investigations of its meaning in modern America. Assessing the five major areas enumerated above, this essay also offers some possibly fruitful avenues of future research.