Performance-Based Vulnerability Assessment of Multi-Story Reinforced Concrete Structures Exposed to Pre- and Post-Earthquake Fire

Post-earthquake fire can potentially bring about much more damage than the earthquake itself. Performing a vulnerability assessment for a structure that has already sustained damage in an earthquake and is then exposed to fire is therefore of importance. This paper describes a performance-based investigation in which applied loads to a structure are appropriately quantified. To do so, a sequential structural analysis is performed on the Life Safety performance level of a three-story reinforced concrete frame selected from a building. For the analysis to be more realistic, the slab is also included in the frame analysis through the concept of effective length. The frame is first subjected to an earthquake load with the PGA of 0.30 g followed by a fire analysis, using the ISO834 fire curve and the iBMB fire curve. The time needed for the structure weakened by the earthquake to collapse under fire is then calculated. As a benchmark, fire-only analysis is also performed for the undamaged frame. Moreover, the effect of thermal spalling is considered in the slabs. The selected frame is evaluated under various failure criteria such as load capacity, displacement, and rate of displacement. The results show that no failure is observed when the frame is exposed to fire alone, either when using the ISO curve or the iBMB curve under various failure criteria. It is also shown that while the PEF resistance based on load capacity criteria under the ISO curve is around 120 minutes, it reduces to about 95 min under the iBMB curve. However, considering the rate of deflection failure criteria, the PEF resistance is around 103 min and 75 min under the ISO and the iBMB curves, respectively. It is then concluded that in the PEF analysis, the iBMB curve is more compatible with the concept of performance-based design than the ISO curve is.     

Expertise et Construction de la Valeur Artistique (XIVe–XVe siècle)

Working from a body of Tuscan commission contracts from the 14(th) and 15(th) centuries, this article shows how painting was the object of concrete evaluative practices among professional painters before becoming the subject of discussion for scholars and humanists. This study rests on the legal and economic analysis of clauses of expertise by which painters and commissioners submitted the work to other painters in order to guarantee the proper execution of the contract, thus constituting an essential evaluative measure for the economy of painting.     

Caméras sur le Terrain Enquêter Pendant un Tournage

Can sociologists and journalists share a given field of investigation? What are the consequences on a sociological investigation of group of working class advanced students when a film crew is there to shoot a documentary about them at the same time ? This article offers an analysis of collaboration of the journalists and the sociologist - it depicts the varied responses by the students to the shooting of the documentary, and shows what effects these responses had on the sociologist’s investigation. Doing so, the article demonstrates that this collaboration yields significant explanatory results even it is a difficult one.     

日本及其东亚邻邦制陶技术的起源

简介 本文旨在回顾与比较东亚地区尤其是有关日本和俄罗斯远东地区从旧石器时代向新石器时代过渡阶段考古记录的情况.制陶技术的出现标志着旧石器时代的结束和新石器时代的开始(参见:Chard 1974;Barnes 1999).东亚地区新石器时代最早阶段的最完整的记录当属日本的考古序列,因为如下一系列的因素使得这里的信息数据比东亚其他发现早期陶器的地区都更为详尽:(1)拥有众多的考古学家和其他方面的专家;(2)大批建设项目需要发掘;(3)有相对充足的资金保证.     

New species of organic-walled dinoflagellate cysts from the Maastrichtian–Danian boundary interval at Ouled Haddou,northern Morocco

Slimani, H., Louwye, S. & Toufiq, A., September 2012. New species of organic-walled dinoflagellate cysts from the Maastrichtian–Danian boundary interval at Ouled Haddou, northern Morocco. Alcheringa 36, 341–358. ISSN 0311-5518.

Seven new dinoflagellate cyst species and subspecies, previously figured under open nomenclature, from Maastrichtian and Danian deposits of Ouled Haddou (eastern external Rif Chain) in northern Morocco are formally described, and their stratigraphic ranges are clarified. Conosphaeridium lifum sp. nov. and Kenleyia chabaka sp. nov. have fibrous and reticulate wall surfaces, respectively. Oligosphaeridium saghirum sp. nov. is a small cyst with funnel-shaped distal process extremities. Spiniferella cornuta subsp. kacira subsp. nov. and Fibrocysta brevispinosa sp. nov. are distinguishable by their very short processes. Riculacysta chaouka sp. nov. is characterized by its perforate spinose ectophragm. Andalusiella bacita sp. nov. is a small and spindle-shaped cyst with only a single antapical horn.     

Effects of Near-Fault Pulses on Nonlinear Soil-Structure Systems

ABSTRACT

This paper is focused on effects of near-fault pulse characteristics on seismic performance of soil-structure systems considering foundation uplifting and soil yielding. To this end, an extensive parametric study is conducted. Mid-to-high-rise buildings of different aspect ratios (SR) resting on shallow mat foundations are investigated. Different vertical load-bearing safety factors (F_S) of foundation as well as different soil types (i.e. soft to very dense) are considered in this study. Finite element method is used for numerical modeling. The underlying soil is simply modeled with a set of nonlinear springs and dashpots beneath the foundation. Mathematical near-fault pulse models of fling step and forward directivity are used as input ground motions. The results show that reduction in structural drift demands due to nonlinear soil-structure interaction (SSI) is more considerable in the case of short-period pulses compared to long-period ones. In more precise words, significant reduction occurs when pulse-to-fixed-base period ratio falls within 0.7–1.5 in the case of directivity pulses and 0.5–1.4 in the case of fling pulses. It is also demonstrated that the beneficial effects of nonlinear SSI reduce when the number of stories increases.     

THE EFFECTS OF COLLATERALIZABLE INCOME AND DEBT OVERHANG ON ENTREPRENEURIAL INVESTMENT IN AN OPEN REGIONAL ECONOMY*

ABSTRACT We use a two‐period model to analyze the contractual relationship between entrepreneurs and venture capitalists in an open regional economy. First, we describe the first best investment contract, we study the second best investment contract in the presence of private information, and then we examine the impact of an exogenous second‐period income endowment (collateralizable income) on investment by entrepreneurs. Next, we analyze the interaction between entrepreneurs and venture capitalists when the regional government (RG) must pay off a per capita debt (debt overhang) which it finances by taxing successful second‐period entrepreneurs. We show that a rise in the per capita debt has an effect on investment that is analogous to a fall in the second‐period income endowment. In addition, the overhang of the RG's debt discourages entrepreneurial investment.     

La DéontoLogie Ethnographique À l’Épreuve du Documentaire

This article offers a comparison of the legal suits filed by the interviewees against the director of the documentary être et avoir (to have and to be) with the rights of interviewees in ethnographic investigations, focusing particularly on image copyrights and labor law. To say that interviewees contribute to such investigations in anonymity does not solve the main problem - they are crucial to the investigation, marginal to the analysis, and then are assigned no publication credits. While information about the interviewees should remain confidential, this article argues, that contribution and role in the making of a publication should not be ignored.