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RISCloser Look at the Drift Demand Spectrum
Publisher: American Society of Civil Engineers
Abstract: This technical note explores the physical and mathematical basis for the drift demand spectrum proposed in the 1990's by Iwan, and reveals several unexpected features of the original mathematical formulation. It is shown ...
Retrofitting Suspension Bridges Using Distributed Dampers
Publisher: American Society of Civil Engineers
Abstract: Suspension bridges in the Central and Eastern United States (CEUS) were built before recent advances in earthquake engineering, and may be susceptible to seismic ground motions. A retrofit strategy is proposed in which ...
Comparison of Turbulence Modeling Strategies for Indoor Flows
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Turbulence modeling techniques are compared for the simulation of low speed indoor air flow in a simple room. The effect of inlet turbulence intensity on the flow field is investigated using ...
Free and Forced Longitudinal Vibrations of a Cantilevered Bar With a Crack
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Longitudinal vibrations of a cantilevered bar with a transverse crack are investigated. For undamped, unforced vibrations, frequency spectra are computed and the effects of the crack location and ...
Geometric Optimization of Concentrating Solar Collectors using Monte Carlo Simulation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This paper presents an optimization algorithm for designing linear concentrating solar collectors using stochastic programming. A Monte Carlo technique is used to quantify the performance of the ...
Realistic Modeling of Leakage and Intrusion Flows through Leak Openings in Pipes
Publisher: American Society of Civil Engineers
Abstract: The hydraulics of leakage and intrusion flows through leak openings in pipes is complicated by variations in the leak areas owing to changes in pressure. This paper argues that the pressure–area relationship can reasonably ...
Detection of Cracks in Rotating Timoshenko Shafts Using Axial Impulses
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A rotating Timoshenko shaft with a single transverse crack is considered. The crack opens and closes during motion and is represented by generalized forces and moments. The shaft has simply ...
Application of Internally Damped Shearbeam Model to Analysis of Buildings under Earthquakes: Robust Procedure for Quick Evaluation of Seismic Performance
Publisher: American Society of Civil Engineers
Abstract: A step-by-step procedure for linear analysis of building structures with rigid floor beams is developed and presented. The method outputs the maximum story drift envelope, and consists of a series of explicit formulas that ...
On Scaling Down Turbines to Millimeter Size
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The purpose of this work is to establish the maximum theoretical efficiency that a viscous flow turbine (such as a Tesla turbine) can achieve. This is very much in the spirit of the Betz ...
Evaluation of Factors Affecting Performance of Direct Filtration
Publisher: American Society of Civil Engineers
Abstract: The effects of selected initial conditions and operating parameters on the direct filtration process are evaluated by using a synthetic water/benchscale apparatus. An orthogonal design of the controlled experimental ...