Modelling and Seismic Response Analysis of Italian Code-Conforming Base-Isolated Buildings

ABSTRACT

This paper reports on results of nonlinear analyses performed within the RINTC project on an RC building isolated with different systems (High Damping Rubber Bearings, High Damping Rubber Bearings and Flat Sliding Bearings, Friction Pendulum System) and designed according to the Italian design code. The seismic response has been evaluated under different seismic input levels of two sites with different hazard and by considering two Limit States: Global Collapse and Usability-Preventing Damage. The influence of seismic stoppers and modelling uncertainties is also evaluated. Results permit to compute the implicit collapse risk and to identify critical aspects of current design procedures.     

Hydraulic and hydrochemical properties of deep sedimentary reservoirs of the Upper Rhine Graben,Europe

Hydraulic and hydrochemical data from several hundred wells mostly drilled by the oil and gas industry within the four deep carbonate and siliciclastic reservoirs of the Upper Rhine Graben area in France and Germany have been compiled, examined, validated and analysed with the aim to characterize fluids and reservoir properties. Due to enhanced temperatures in the subsurface of the Upper Rhine Graben, this study on hydraulic and hydrochemical properties has been motivated by an increasing interest in deep hydrogeothermal energy projects in the Rhine rift valley. The four examined geothermal reservoir formations are characterized by high hydraulic conductivity reflecting the active tectonic setting of the rift valley and its fractured and karstified reservoirs. The hydraulic conductivity decreases only marginally with depth in each of the reservoirs, because the Upper Rhine Graben is a young tectonically active structure. The generally high hydraulic conductivity of the reservoir rocks permits cross‐formation advective flow of thermal water. Water composition data reflect the origin and hydrochemical evolution of deep water. Shallow water to 500 m depth is, in general, weakly mineralized. The chemical signature of the water is controlled by fluid–rock geochemical interactions. With increasing depth, the total of dissolved solids (TDS) increases. In all reservoirs, the fluids evolve to a NaCl‐dominated brine. The high salinity of the reservoirs is partly derived from dissolution of halite in evaporitic Triassic and Cenozoic formations, and partly from the fluids residing in the crystalline basement. Water of all four reservoirs is saturated with respect to calcite and other minerals including quartz and barite.     

‘A Bed of Procrustes’: The Aden Protectorate and the Forward Policy 1934–44

This article explores attempts by British colonial officials based in Aden to extend systems of political administration to the colony's tribal hinterland during the late interwar and early wartime period. Commencing initially with delicate attempts to recast faltering relations between tribal chiefs and their subjects, the policy would culminate a decade later with the despatch of British military units throughout the furthest extents of the protectorate in support of a range of direct political agreements with local rulers that would eventually set the conditions for federation. The intervening years featured a series of little-known debates among various officials on how precisely to cement British influence in the tribal areas, and the philosophy of administration to be pursued to that end. These would expose an element of confusion as to which techniques would best satisfy British policy, and reveal a preference on the part of some for the application of methods atypical of those used elsewhere under Colonial Office jurisdiction, and which drew their inspiration instead from systems of control used on India's volatile frontiers.     

圆明园新证——万方安和考

万方安和是清代皇家离宫圆明园中独具特色的园林景建筑之一,其主题以万字房为重心,十字亭为结点,一字长楼山高水长为回应,形成山环水聚、万年如意的园林宫殿形局。其经营意象援引佛教宇宙图式、兼及禅宗沩仰宗风"圆相"奥旨,同时溯源汉地明堂,既是对"圆明主题"的进一步深化,又是雍正皇权极度膨胀在造园理念方面的突出表现。     

论唐代的封驳制度

唐代以封还皇帝诏命为对象的封驳制度渊源于两汉,酝酿于初唐,形成于唐代中后期,主要由门下省官员给事中职掌。封驳的目的在于追救缺失,防患于未然,而封还诏敕并加以驳正则是其最主要的方式。在权力高度集中的封建皇权社会,封驳制度在加强权力监督、抑制皇权膨胀等方面无疑有着积极的意义,然而这种作用也不宜高估,唐代中后期三省制的破坏在很大程度上妨碍了封驳作用的发挥,而当政者能否接受逆耳之言、给事中能否履行职责也同样决定着封驳作用的发挥。     

乾隆初滇省代京铸钱失败原因浅析

文章通过对乾隆初年滇省代京铸钱之具体情况的考察,认为滇省代京铸钱是清政府为扭转铸钱严重亏损而采取的一项铸币政策。但滇省代京铸钱较之京局直接鼓铸反而增加了铸钱成本。实行滇省代京铸钱后,清政府铸钱开始盈利,但这并非滇省代京铸钱所致,而是清政府对云南铜矿实行垄断经营、压低铜价,即钱局使用滇铜鼓铸的结果。实际上,在使用滇铜为原料的前提下,京局直接鼓铸较之滇省代京铸钱更能节省成本,这是清政府停止滇省代京铸钱的基本原因。同时也说明清政府于乾隆初年实行滇省代京铸钱存在着决策性失误。     

Pyrite–sulfosalt reactions and semimetal fractionation in the Chinkuashih,Taiwan, copper–gold deposit: a 1 Ma paleo‐fumarole

The mineralized fracture system that underlay paleo‐fumarole field at Chinkuashih, Taiwan has been exposed by copper–gold mining to depths of about 550 m below the paleo‐surface. Its mineralogy and systematic variations in metal and semimetal (Fe, Cu, As, Sb, Bi, Hg, Cd, Sn, Zn, Pb, Se, Te, Au, Ag) concentrations provide insights into the chemical responses of a magmatic‐vapor phase as it expands through fracture arrays to the surface and discharges as fumaroles associated with more extensive solfatara. At Chinkuashih, following initial sealing of the fractures by silica‐alunite alteration, brittle failure reestablished discharge from an underlying reservoir of magmatic vapor. Crystalline pyrite was deposited first in the fractures and was succeeded and replaced by ‘enargite’ (Cu₃(As,Sb)S₄) as sulfosalt encrustations (‘sublimate’) on fracture surfaces and in extensional cracks. Subsequent recrystallization resulted in complex exsolution intergrowths with antimony fractionation to the evolving crystal–vapor interface. Heavy metal fractionation between sulfosalt and vapor enriched the vapor phase in heavy metals that subsequently precipitated as complex Bi–Hg–Sn sulfosalts in discrete areas (paleo‐fumaroles) close to the paleo‐surface in a manner analogous to modern‐day fumaroles on active volcanoes such as Vulcano, Italy. As in similar paleo‐fumaroles (e.g., El Indio, Chile and Lepanto, Philippines), the most characteristic reaction sequence is the partial replacement of the early pyrite by enargite and Fe‐tennantite. It is proposed that this reaction tracks the decrease in the pressure of the underlying magmatic‐vapor reservoir because of the sustained discharge of vapor to the surface.     

A REDISCOVERED LOST SEAL FROM GEZER

Abstract

A carnelian pebble stamp seal excavated by Macalister at Gezer and believed lost, and a seal kept today in the Bible Lands Museum in Jerusalem, are one and the same. A cast of the original kept by the Palestine Exploration Fund in London proves to be identical to the seal in Jerusalem. The unique iconography of the seal showing a man in a cultic gesture in front of a griffin, as well as its stylistic details, show it to be an Assyrianized product of the late eighth or seventh century bc, possibly of local production.