This article investigates the ductility reduction factors for RC eccentric frame structures subjected to pulse-like ground motions. The structural models are with the strength eccentricities which are much disadvantageous than the stiffness eccentricities during the inelastic response range. A method to determine the ductility reduction factors of the strength eccentric structures is suggested by modifying those of reference symmetric structures through an eccentricity modification factor. The four factors of strength eccentricity ratio, ductility ratio, story number and velocity pulse of ground motions, are investigated to gain insight into this modification factor. It shows that the ductility reduction factors of the eccentric structures are clearly smaller than those of the symmetric structures. The eccentricity modification factor is mainly affected by the strength eccentricity and the ductility ratio, decreasing with the increment of the eccentricity or the decrement of the ductility ratio in a medium eccentricity range. The earthquake pulse-like effect and the eccentricity have coupling influence on the modification factor, while the effect of story number is not apparent. Based on the results of a comprehensive statistical study a simplified expression is suggested, which can estimate the eccentricity modification factors for both pulse-like and nonpulse-like ground motion cases. 相似文献
SUMMARY: Excavation in advance of a new housing development on the site of the Barton Hill Pottery, Bristol, uncovered the full footprint of a late 19th-century pottery, a large quantity of redware wasters, and a dump of whiteware wasters from another nearby factory, which include examples of Royal Navy mess ware.相似文献
Cai, C. & Huang, D., September 2016. Omma daxishanense sp. nov., a fossil representative of an extant Australian endemic genus recorded from the Late Jurassic of China (Coleoptera: Ommatidae). Alcheringa 41, xxx–xxx. ISSN 0311-5518.
Omma Newman is an extant ommatid genus currently endemic to Australia. A new Omma species, O. daxishanense sp. nov. is described and illustrated based on a compression fossil from the Upper Jurassic Tiaojishan Formation at Daxishan, a fossil locality well known for yielding mammals, feathered dinosaurs and diverse pterosaurs. Omma daxishanense is very similar morphologically to the extant O. sagitta, but differs from the latter by its broader body and prominent temples. The new discovery documents the first valid Omma species from the Mesozoic of China and highlights the antiquity and palaeodiversity of the extant Australian endemic genus.
Chenyang Cai [cycai@nigpas.ac.cn], Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, PR China; Diying Huang [dyhuang@nigpas.ac.cn], State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, PR China.相似文献
It is often said that “Confucius composed the Chunqiu 春秋 (The Spring and Autumn Annals) to convey the way of the king.” Scholars have long noticed that before the founding of and during the Han Dynasty the phrase that served as the title of the allegedly Confucian work, “Chunqiu,” was also often used to designate history in general. In what intellectual and textual contexts did the term evolve from something general into a specific concept associated with Confucius? What works or ideas did pre-Han and Han scholars have in mind when discussing Confucius’s Chunqiu and the broader “Chunqiu” canon?1 Exploring these questions, the study that follows begins by systematically documenting the occurrences of this term in pre-Han and Han texts. It demonstrates that while Mencius was the first person to associate Confucius’s teachings with the Chunqiu, his statement was a solitary and surprising voice in the pre-Han era. Not until the Western Han Dynasty was Confucius widely heralded as the creator of the Chunqiu. But few scholars are aware that Western Han scholars never strictly distinguished the laconic Chunqiu from the detailed historical knowledge preserved in the Gongyang 公羊, Guliang 谷梁, and Zuo 左 commentaries. Furthermore, as the Chunqiu gained canonical status, the phrase still served as a generic term, referring to various historical narratives. Zhang Xuecheng 章学诚 is famous for claiming that “The Six Classics are all history,” and I shall show that in the minds of the people of the Han Dynasty, all historical works were classics. 相似文献