Engineering Commons^™

Field Measurements Of A Diaphragm Wall Foundation, T. Matsui, H. Nakajima, T. Nagano, T. Hosoi, Y. Fukuda, K. Hayashi

International Conference on Case Histories in Geotechnical Engineering

Field measurements of a small-sectioned diaphragm wall foundation for a highway bridge have been performed to understand the stability of the trench wall during construction. In this paper, a case history on the field measurements of the diaphragm wall foundation during deep trench excavation is presented.

Soil Improvements Of An Inhomogeneous Reclaimed Ground, Sasumu Yasuda, Hiroshi Suzuki, Hideotoshi Takemoto, Kohi Hayashi, Kazuo Saito, Naomi Ine

International Conference on Case Histories in Geotechnical Engineering

A coal storage yard for an electric power plant was to be constructed on reclaimed land in northern Japan. As the reclaimed land consisted of loose sand and soft silt, a deep well excavation method, a dynamic compaction method and a sand compaction method were selected to improve clayey grounds, sandy grounds and intermediate grounds, respectively. After the improvement, no obvious settlement and no liquefaction has been induced.

Session 10, 11, 12 − Opening Remarks, Shiming Wu

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Case History Of Aquifer Thermal Energy Storage (Ates), C. Mirza

International Conference on Case Histories in Geotechnical Engineering

Aquifer Thermal Energy storage (ATES) is a relatively new energy conserving technology which enables subsurface seasonal storage of freely available cold of winters and heat of summers for re-use in the opposite season. Thermal energy is stored in aquifers, groundwater serving as the medium of energy transfer. This case history describes an ATES installation for an office building in Ontario. Groundwater from a 10 m thick sandy aquifer at the 60 m depth is pumped from one pair of wells and re-injected, after extraction or addition of heat, into an opposing pair of wells. ATES technology not only conserves non-renewable …

Foundation Problems At A Residential Complex – A Case History, U. N. Sinha

International Conference on Case Histories in Geotechnical Engineering

The paper describes a case history in connection with foundation problems at a residential complex on the adequacy or otherwise of the bearing capacity of foundation soil for raising the existing buildings to double storeyed configuration. The study made possible to raise few existing buildings to double storeyed where safe bearing capacity was found adequate and these buildings could reveal good performance since implementation of suggestions.

Vibrations Due To Pile Driving, M. R. Lewis, J. R. Davie

International Conference on Case Histories in Geotechnical Engineering

Vibrations due to pile installation have long been a concern to owners, contractors, and engineers. Specifically, what levels of vibrations can be assumed for a given pile, hammer, and subsurface conditions and how can these levels be predicted in advance of construction so an assessment of nearby structures can be made? This paper presents the results of vibration monitoring at several sites where various piles and pile hammers have been used, and recommends a conservative method of predicting peak particle velocity at the ground surface near pile installations. Where sensitive structures are involved, a response spectrum analysis is recommended.

General Report On Session No. 5: Case Histories Of Retaining Structures And Deep Excavations, John T. Christian, Çetin Soydemir, Alan J. Lutenegger

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

A Probabilistic Model And A Software Tool For Avcs Longitudinal Collision/Safety Analysis, H.-S. Jacob Tsao, Randolph Hall

Faculty Publications

This paper develops a probabilistic model and a software tool for analyzing longitudinal collision/safety between two automated vehicles. The input parameters are the length of the gap between the two vehicles, the common speed prior to the failure, the reaction delay of the following vehicle and a bivariate pint distribution of the deceleration rates of the two vehicles. The output includes the probability of a collision and also the probability distribution of the relative speed at collision time.We will use this model to compare the safety consequences associated with the platooning and "free-agent" vehicle-following rules. We will also demonstrate that …

Numerical Algorithms For Squaring-Up Non-Square Systems Part Ii: General Case, Pradeep Misra

Electrical Engineering Faculty Publications

In this paper, we present numerical algorithms for squaring a non-square system by finding -additional columns in input matrix (for tall systems) and by finding additional rows in output matrix (for wide systems). Several case are considered depending up the requirements on the ra of the input-output interaction matrix.

Building A Gateway For The Cd-Rom Network: A Step Toward The Virtual Library With The Virtual Microsystems V-Server, Margaret Sylvia

Faculty Publications

Describes one college library's experience with a gateway for dial-in access to its CD-ROM network to increase access to automated index searching for students off-campus. Hardware and software choices are discussed in terms of access, reliability, affordability, and ease of use. Installation problems are discussed, and an appendix lists product information.

Two-Tier Partially Enclosed Air-Cure Tobacco Barn, George A. Duncan

Agricultural Engineering Extension Publications

With the rising costs, scarcity of materials, and greater construction requirements for regular tobacco barns, the concept of a lower cost but functionally sound tobacco curing facility with partial or no sidewall closure has been developed into a blueprint plan shown in Figure 1. The plan can be built and used now with partial sidewalls and enclosed more completely later if desired.

Nonlinear Dynamic Finite Element Simulation Of Hydroelastic Mounts For Light Weight Vehicles, Talla Jayapal Reddy

Masters Theses

Modern light weight vehicles generate large noise levels, that may need bulky classical rubber mounts to suppress. Hydroelastic mounts can significantly reduce the vibration level of current production automobiles without weight penalty. However, the highly nonlinear behavior of hydroelastic mounts has not been established yet and its use is, therefore, limited to trial and error design methods.

This study discusses the implementation of nonlinear finite element simulation of hydroelastic mounts using the ANSYS finite element code. Fluid elements are limited to linear analysis and therefore are incompatible with the nonlinear hyperelastic elements. A method is proposed to simulate the fluid …

Thermal Behavior Of A Stratified Cylindrical Energy Storage Tank, Sheherazad Youssef Ezz Eldeen Ahmed Korayem

Archived Theses and Dissertations

No abstract provided.

Evaluation Of Dynamic Stresses And Fatigue Life Prediction For Randomly Loaded Structure, Walied Ahmed Moussa

Archived Theses and Dissertations

No abstract provided.

A Decision Criteria To Select An Associative-Memory Organization That Minimizes The Execution Time Of A Mix Of Associative-Search Operations, David W. Banton

Theses and Dissertations

The dissertation develops a decision criteria to select an associative-memory organization that minimizes the execution time of a mix of associative-search operations and a decision criteria to estimate the layout dimensions of each organization for a specified memory size. The dissertation reclassifies Feng's associative-search operations into three hardware-influenced categories: bit-position independent (BPI), record-content independent (RCI); bit-position dependent (BPD), RCI; and BPD, record-content dependent (RCD). It develops a relationship between the categories and three associative-memory organizations: the CAM, the bit-serial word-parallel associative memory (BSWPAM) , and the extreme-search associative memory (ESAM). A version of the CAM, three versions of the BSWPAM, …

Radome Depolarization Effects On Monopulse Receiver Tracking Performance, Michael A. Temple

Theses and Dissertations

Boresight Error (BSE), defined as the angular deviation between the true position and the apparent position of a target as indicated by a radar, is an important figure of merit for a tracking radar. A significant contributor to system BSE is the protective radome. This research effort employed a GO technique to investigate the effects of a radome on BSE, expanding previous ray- trace receive techniques to include: (1) a uniquely defined/developed mathematical description for each surface within arbitrary multi-layer tapered radomes, (2) an 'ideal' taper function concept for obtaining optimum BSE prediction performance, (3) a generalized technique for calculating …

Phased Array Antenna Analysis Using Hybrid Finite Element Methods, Daniel T. Mcgrath

Theses and Dissertations

This research in computational electromagnetics developed a new method for predicting the near-field mutual coupling effects in phased array antennas, using the finite element method (FEM) in combination with integral equations. Accurate feed modeling is accomplished by enforcing continuity between the FEM solution and an arbitrary number of wave guide models across a ground plane aperture. A periodic integral equation is imposed above the antenna's physical structure in order to enforce the radiation condition and to confine the analysis to an array unit cell. The electric field is expanded in terms of vector finite elements, and Galerkin's method is used …

Linear Characteristic Spatial Quadrature For Discrete Ordinates Neutral Particle Transport On Arbitrary Triangles, Dennis J. Miller

Theses and Dissertations

A new discrete ordinates spatial quadrature for arbitrary triangular cells is derived and compared to its rectangular cell linear characteristic counterpart. The triangular mesh is more flexible, allowing curved surfaces and off-axis angles to be approximated with many fewer spatial cells. The triangle method is consistently more accurate on example problems tested here. Arbitrary orientation and size of the triangles allow non-patterned meshes to be developed which appears to ameliorate numerical diffusion. The triangle linear characteristic quadrature converges at nearly the same rate as rectangular Linear characteristic on Lathrop's problem. Mesh sensitivity measurements show large variations in triangle vertex locations …

Tolerance Specification Of Robot Kinematic Parameters Using An Experimental Design Technique, Y.H. Andrew Liou, Paul P. Lin, Richard R. Lindeke, Hsiang-Dih Chiang

Mechanical Engineering Faculty Publications

This paper presents the tolerance specification of robot kinematic parameters using the Taguchi method. The concept of employing inner and outer orthogonal arrays to identify the significant parameters and select the optimal tolerance range for each parameter is proposed. The performance measure based on signal-to-noise ratios (S/N) using the Taguchi method is validated by Monte Carlo simulations. Finally, a step-by-step tolerance specification methodology is developed and illustrated with a planar two-link manipulator and a five-degree-of-freedom Rhino robot.

Optimization Of The Seating Position In A Human-Powered Vehicle, Y. Lei, Mohamed Trabia, D. Too

Mechanical Engineering Faculty Research

Until recently, most of the human-powered vehicles (HPV) were designed focusing solely on its aerodynamics characteristic. In many of these HPV designs, the rider seating position was arbitrarily chosen without consideration of its effect on the rider's comfort and cycling effectiveness. Also, there is no guarantee that the seating position is related to maximum power output. Too (1991) used an experimental approach to determine that the rider will produce the maximum anaerobic power when the seat tube angle of a bicycle is at 75° whereas Hull and Gonzalez (1990) used an engineering approach to optimize the cycling biomechanics. However several …

Study Of Single-Electron Capture From He, Ne And Ar By Low-Energy Ne^Q+ Recoil Ions Using Translational Energy Spectroscopy, Renad Qubaj-Said

Masters Theses

No abstract provided.

Photopolarimeter Based On Planar Grating Diffraction, R. M.A. Azzam, K. A. Giardina

Electrical Engineering Faculty Publications

A division-of-amplitude photopolarimeter (DOAP) is described that employs a diffraction grating in the conventional spectrometer orientation with the grating grooves normal to the plane of incidence. Four coplanar diffracted orders are used for polarimetric analysis to determine all four Stokes parameters of incident light simultaneously and virtually instantaneously (with the speed being determined solely by the photodetectors and their associated electronics); a fifth order is used for alignment by autocollimation or by use of a position-sensing quadrant detector. To sensitize the instrument for the +45° and -45° azimuths of incident linearly polarized light and for the handedness of incident circular …

Drainage Basins And Flash Flood Hazards In Al-Ain Area, United Arab Emirates, Moza Hamad Al-Shamsi

Civil and Environmental Theses

Flash flood strike different parts of Al-Ain area virtually every year causing Serious property loses this study investigates the main factors control ling this Flooding, namely. (a) Climate, (b) geomorphology, and (c) hydrogeology Climatically, mo t of rainstorms do occur during the month of February. Geomorphologic ally, the landforms and drainage systems are the main factors. Hydrogeological, twenty basins were carefully identified and their morphometric Parameters were measured the relations between these morphometric parameters and flash floods were accordingly assessed. The results show that most severe damage did occur in buildings and farms in Al Ain Area the most influential …

Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

Case Histories Of Pile Foundations In Bombay Region, K. R. Datye, J. R. Patil

International Conference on Case Histories in Geotechnical Engineering

Piles in Bombay region are bored cast-in-situ installed by bailor and chisel boring or direct mud circulation with drop chisels. In weak and weathered rock interpretation of core drilling, SPT, CPT, pressuremeter tests are subject to several limitations, hence design parameters based on conventional soil investigation methods are subject to uncertainties. The past practice has been empirical and the designers relied mainly on load tests and failures have occurred in areas subject to considerable variation in rock characteristics and large depth of soft clay overburden. Recently improvements in investigation and design methodology have been introduced based on postulated relations of …

The Agua Prieta Powerhouse Slope Instability, F. Gonzalez-Valencia, S. Herrera-Castañeda

International Conference on Case Histories in Geotechnical Engineering

The slope instability that endangered seriously the powerhouse of the Aqua Prieta Hydroelectric Project and involved about one million cubic meters of soils and breccias is described. The evolution of the geotechnical instrumentation measurements done from October 1987 to date, the geomechanic analysis performed and the stabilization works are discussed.

Combined Isolation Foundation By Elastic Base Plate And Ground Barriers, Guang-Yun Gao, Xian-Jian Yang

International Conference on Case Histories in Geotechnical Engineering

A high sensitive and large semi-anechoic chamber, designed by a new system of isolation is reported in this paper. The combined isolation of a large size elastic plate on sand cushion and pile barriers was used in this system. By properly designing the stiffness of elastic base plate, the amplitude of the anechoic chamber floor under the action of dynamic toad of testing vehicle can be controlled within the allowed range of accuracy. This new system has been conformed with the disturbance of outside of vibration on anechoic chamber (passive vibration isolation) and with that of vehicle testing inside the …

Braced Excavation At The Nipsco Bailly Station Power Plant, J. D. Bray, R. J. Deschamps, Ad. J. Augello, R. S. Parkison

International Conference on Case Histories in Geotechnical Engineering

In July 1991, the intake and discharge pipelines of a major power plant collapsed. A 60-ft. deep excavation adjacent to several structures sensitive to ground movements was required- for remediation. Based on conventional analyses, the estimated factor of safety against base heave was close to 1. 0 for the required excavation, and there was grave concern for damage to appurtenant structures. A viable reconstruction scheme was developed through the integration of finite element analyses and construction monitoring.

A Case History Of The Collapse Accident Of A Temporary Earth Support Structure, Noriyuki Horii, Shigeo Hanayasu, Yasuo Toyosawa, Satoshi Tamate, Takakazu Maruyasu

International Conference on Case Histories in Geotechnical Engineering

This paper presents a case study on the collapse accident of a temporary earth support structure. The examination of the design plans and investigations of the construction site where the accident occurred bas been carried out to throw light on the accident situations. Some causes of the accident occurrence which have been derived from these examinations and countermeasures for prevention of these types of accidents are discussed.

Discussions And Replies Session 2, Wu Yingwoei, B. B. K. Huat, Ming-Hung Chen, Wade E. Cooper, Ioan Stanculescu, Anton Chirica, Pedro S. Sêco E Pinto

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.