After Northridge (1994) and Kobe (1995) earthquakes, several studies have been conducted to improve the seismic performance of steel structures. In this investigation, new steel moment-resisting connections (FSFN) developed by the authors, were studied by the non-linear numerical analysis. These connections were single-sided beam-to-column assemblies that are representative of exterior beam-to-...

the proposal lateral load pattern for pushover analysis is given in two forms for symmetric concrete buildings: 1-(x/h)0.5 for low-rise and mid-rise buildings, 2- sin(πx/h) for high-rise buildings. these two forms give more realistic results as compared to conventional load patterns such as triangular and uniform load patterns. the assumed buildings of 4, 8, 12, 16, 20 and 30 story concrete bui...

The proposal lateral load pattern for pushover analysis is given in two forms for symmetric concrete buildings: 1-(X/H)0.5 for low-rise and mid-rise buildings, 2- Sin(ΠX/H) for high-rise buildings. These two forms give more realistic results as compared to conventional load patterns such as triangular and uniform load patterns. The assumed buildings of 4, 8, 12, 16, 20 and 30 story concrete bui...

this paper aims to assess the application of support vector machine (svm) regression in order to analysis flexible pavements. to this end, 10000 four-layer flexible pavement sections consisted of asphalt concrete layer, granular base layer, granular subbase layer, and subgrade soil were analyzed under the effect of standard axle loading using multi-layered elastic theory and pavement critical r...

the nonlinear static pushover analysis technique is mostly used in the performance-based design of structures and it is favored over nonlinear response history analysis. however, the pushover analysis with fema load distributions losses its accuracy in estimating seismic responses of long period structures when higher mode effects are important. some procedures have been offered to consider thi...

understanding of the natural history of chronic hbv infection is useful for presenting the optimal management of chronic hbv infection. the aim of this study was to evaluate the natural history of chronic hepatitis b infection.in this cross sectional study, 219 untreated chronic hepatitis b patients from jan. 2010 to aug. 2012 were included. the subjects were classified in four groups based on ...

A standard seawater, to be used in ali salinity determinations, was first recommended to oceanographers by Martin Knudsen in 1 XY9. The history of how the standard was developed over the past 70 years orso, in such a way that continuity was maintained in ali chlorinity and salinity determinations, is described in this paper. Discussion of the Primary Standard and of the history of the Standard ...

Background: Firefighting and rescue require high physical and psychological needs under unpredictable and dangerous conditions. Thus, this study aimed to investigate mental workload and affecting factors in firefighters. Materials and Methods: This is a descriptive study which was conducted on 250 firefighters of Tehran, Iran. National Aeronautics and Space Administration Task Load Index (NASA...

The reward history of a stimulus can yield strong attentional selection biases. Indeed, capture be triggered by previously rewarded items which are neither salient nor relevant for the ongoing task, even when is clearly counter-productive to actually obtain outcome. Therefore, value-driven (VDAC) has been argued an automatic attention mechanism. Our study aimed at putting VDAC automaticity dire...