Response of Embedded Footings to Vertical Vibrations
Field vibratory tests have been carried out to study the effect of embedment on the vertical response of footings. Steady-state vibration tests indicate decrease of maximum amplitudes...

Nonlinear Dynamics of Curved Cable Elements
A finite element analog to the dynamic response of nonlinear cables has been developed which employs straight cable elements to model the curved geometry of the cable system. Temporal...

Incremental Response of 3-D Cable Networks
A finite element analog to the nonlinear response of single cables to dynamic loadings has been introduced previously. The intent of this note is to extend the applicability of the finite...

Approximate Solution for Unconfined Seepage
An approximate solution procedure by using the finite element method is developed for one-dimensional unsteady free surface seepage. The numerical results are compared with experiments...

Random Behavior of Columns
Using an analog computer for simulations, an empirical relationship is developed for the stability condition of a pin-ended column, which is excited by a physical white noise. The effect...

Nonlinear Bending of Bars
The object of the present investigation is to develop a method, using the analog computer, for the analysis of nonlinear bending of bars having any arbitrary shape and subjected to arbitrary...

Monte Carlo Study of Seismic Structural Safety
A simulation of the lateral ground motion of strong earthquakes is performed with the use of a random function generator and an analog computer. The statistical properties of the simulated...

Analog Analysis of Water Distribution Networks
A technique for solving hydraulic network flow distribution problems using a standard analog computer is presented. This method can be applied to networks which include various hydraulic...

Distribution of Response to Simulated Earthquakes
The problem of establishing distribution functions of peak relative responses of linear single degree-of-freedom (SDF) systems to earthquake excitation has received attention from several...

Seepage Study using Electrical Analog
A simple and inexpensive electrical analog is considered, which was used to study two-dimensional seepage in heterogeneous media. It consists of multiple layers of conductive paper. Simple...

Analog of Ground Water in East-Central New Mexico
A study, utilizing an electric resistor-capacitor analog model, has been made to determine the adequacy of the ground water supply for the approximate 60,000 acres now irrigated in Portales...

Analog Simulation of Activated Sludge Systems
Analog computer solutions of activated sludge design equations are presented for constant, shock, and periodic feed input conditions. System responses of the aerated lagoon, extended aeration,...

Rotary Flow Meter as Turbulence Transducer
Two factors prevent the direct determination of the point spectrum of axial turbulence from a spectrum of the fluctuations in rpm values of the analog output of a rotary flow meter. The...

Graphical Statistics and Common-Sense Applications
Analogs in statistics and mechanics can give the engineer a commonsense meaning of arithmetic means, standard deviations, and lines of mutual regression by least squares. Even so, numbers...

Drawdowns Due to Pumping from Strip Aquifers
Drawdown patterns due to pumping from wells in long narrow (strip) aquifers are dependent mainly on the type of side boundary (recharge, impermeable). A theoretical solution is developed...

Discrete Model Analysis of Elastic-Plastic Plates
By invoking the usual assumptions of the classical theory of plates and shells, a discrete flexural model of a plate is deduced from a discrete model of three-space solids. All the flexural...

Waterhammer Analysis by Analog Computers
The basic partial differential equations for unsteady flow are adapted to a standard analog computer. Two waterhammer examples are computed and compared to both experimental and precise...

Airplane Take-off and Landing Paths
The problem of tracking airplanes in the approach zone of a major airport was solved using ordinary cameras, descriptive geometry, and vector computations. Mean errors in elevation were...

Snake Plain Analog Studies
Design, construction, and operation of an electric analog to correlate existing geologic and hydrologic data, and to guide future exchange pimping and recharge operations in the Snake...

Stress-Controlled Apparatus for Triaxial Testing
A testing machine in which the rate of true stress can be controlled manually or automatically is described. A pneumatic analog computer continuously calculates the cross section of the...

 

 

 

 

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