Cyclic Response of Concrete Beams Reinforced by Plain Bars

There are many reinforced concrete structures throughout the world that have been built in the past decades that lack appropriate seismic details and reinforced by plain bars. To study the behavior of such buildings, seven beams have been tested under cyclic and monotonic load. The specimens include substandard specimens, with deficient seismic details and reinforced by plain bars, specimens designed in accordance with ACI-318-99 but reinforced by plain bars, and standard specimens reinforced by deformed bars. The tests indicate that the substandard specimens sustain relatively large slip of longitudinal bars, separation of specimen relative to foundation and sliding at large deformation phase, low initial stiffness ratio, limited lateral displacement capacity, and loss of nominal yield strength. The specimens reinforced by plain bars in accordance with ACI-318-99 perform almost similar to standard specimens with deformed bars, in terms of elastic stiffness and lateral displacement ductility; but, they sustain larger slip, and smaller yield strength. Failure of all specimens reinforced by plain bars is characterized by flexural cracks without visible shear failure. Residual shear strength of substandard specimens is modeled by dowel action of longitudinal bars to predict a lower limit for lateral strength of the specimens.     

Good Iranian,Bad Iranian: Representations of Iran and Iranians in Time and Newsweek (1998–2009)

This article analyzes the ways in which Iran and Iranians are represented in Western news media sources. Through detailed textual analysis of articles in Time and Newsweek between 1998 and 2009, it demonstrates that journalistic representations of Iran and Iranians are not simply efforts aimed at describing the real Iran, but rather form the basis of what Said refers to as a powerful “community of interpretation” that often reflects and reproduces certain xenophobic stereotypes of non-Western foreign subjects. While some shifts in Western media representations of Iranians have occurred in the thirty years since the revolution, the underlying ontological assumptions of these representations have remained remarkably durable. That is to say, the dominant representational discourse found in these newsmagazines depicts the political behavior of Iranians on the basis of essentialized notions of Persian and/or Islamic civilization, while very often emphasizing the taken for granted superiority of the West. Earlier Orientalist discourses focus on the difference of non-Western foreign subjects by denigrating them as fundamentally anti-modern and incapable of political, cultural and economic development without Western intervention. This article presents an unmistakable discursive pattern in American journalism whereby certain Iranians are incorporated into Western civilization by virtue of their embrace of a Western modernity.     

Analytical Fragility Curves for a Class of Horizontally Curved Box-Girder Bridges

Analytical fragility curves were developed for curved single-frame concrete box-girder bridges with seat-type abutments. The bridges incorporated the current seismic design considerations and modern details that were recently adopted by CALTRANS. Fragility curves demonstrated that columns were the most vulnerable components, while the modern seismic details successfully protected the abutment piles from damage during large earthquakes. Increasing the subtended angle affected the seismic vulnerability at both the component and system levels. Functional relationships were proposed to evaluate the seismic vulnerability of curved bridges. Moreover, fragility curve parameters were shown to depend on soil condition and spectral characteristics of ground motions.