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Displaying records 51 to 60 of 78 records.
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51. Performance of Steel Moment Connections under a Column Removal Scenario. I: Experiments
Published: 4/3/2012
Authors: Hai Sang Lew, Joseph A Main, Stephen D Robert, Fahim Sadek, Vincent Chiarito
Abstract: This paper presents an experimental study of two full-scale steel beam-column assemblies, each comprising three columns and two beams, to (1) define their response characteristics under a column removal scenario, including the capacity of the beams a ...

52. Performance of Steel Moment Connections under a Column Removal Scenario. II: Analysis
Published: 4/3/2012
Authors: Fahim Sadek, Joseph A Main, Hai Sang Lew, Sherif El-Tawil
Abstract: This paper presents a computational investigation of the response of steel beam-column assemblies with moment connections under monotonic loading conditions simulating a column removal scenario. Two beam-column assemblies are analyzed, which incorpo ...

53. Robustness Assessment of RC Frame Buildings under Column Loss Scenarios
Published: 4/3/2014
Authors: Yihai Bao, Joseph A Main, Hai Sang Lew, Fahim Sadek
Abstract: A computational assessment of the robustness of reinforced concrete (RC) building structures under column loss scenarios is presented. A reduced-order modeling approach is presented for three-dimensional RC framing systems, including the floor slab, ...

54. Robustness of Composite Floor Systems With Shear Connections: Modeling, Simulation, and Evaluation
Published: Date unknown
Authors: Fahim Sadek, Sherif El-Tawil, Hai Sang Lew
Abstract: This paper presents an analytical assessment of the robustness of concrete deck-steel beam composite floor systems with shear connectors under the assumption that an interior column has been removed. The study provides an insight into the behavior a ...

55. Robustness of Precast Concrete Frames: Experimental and Computational Studies
Published: 4/3/2014
Authors: Joseph A Main, Yihai Bao, Hai Sang Lew, Fahim Sadek
Abstract: This paper describes both full-scale testing and detailed finite-element modeling of a precast concrete moment-frame assembly extracted from the perimeter moment frame of a 10-story prototype building. The assembly comprises two beam spans and three ...

56. Robustness of Steel Gravity Frame Systems with Single-Plate Shear Connections
Series: Technical Note (NIST TN)
Report Number: 1749
Published: 2/27/2013
Authors: Joseph A Main, Fahim Sadek
Abstract: This report presents a computational assessment of the performance of steel gravity framing systems with single-plate shear (,shear tabŠ) connections and composite floor slabs under column loss scenarios. The computational assessment uses a reduced m ...

57. Sampling Errors in the Estimation of Peak Wind-Induced Internal Forces in Low-Rise Structures
Published: 2/1/2004
Authors: Fahim Sadek, S M Diniz, M Kasperski, M Gioffre, Emil Simiu
Abstract: Peak values in time histories of wind effects may be obtained by using the entire information inherent in the time series of the wind effect, a method entailing the estimation of the probability distribution of the peak through the application of the ...

58. Semi-Active Control of Linear and Hysteretic Structures Using Variable Viscous and Magnetorheological Dampers
Published: 7/1/2000
Authors: S El-Borgi, Michael A Riley, Fahim Sadek, N Ayed
Abstract: Numerous studies have been conducted so far on active or hybrid (active/passive) control of hysteretic structures using a wide range of linear and nonlinear control algorithms. However, most research work on the use of semi-active control systems has ...

59. Stochastic Linearization for Control of Hysteretic Structures Using H(Infinity) Algorithm
Published: 1/1/2001
Authors: M Ben Ftima, Fahim Sadek, S El-Borgi, Michael A Riley
Abstract: This paper presents a robust static output feedback H(infinity) algorithm for control of hysteretic civil engineering structures subjected to earthquake ground motions. Hysteretic structures present a problem for control design and algorithm develop ...

60. Strength Evaluation of Connectors for Intermodal Containers
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 6557
Published: 8/1/2000
Authors: Hai Sang Lew, Fahim Sadek, E D Anderson
Abstract: Intermodal containers are used widely in marine cargo handling. In order to facilitate unloading of empty containers from ship to shore, two containers are lifted frequently in tandem. This operation is referred to as vertical tandem lifting. In ...

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