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Seawater Experimental Results of Direct-Contact Condensation for OC-OTEC Applications
Tests of a direct-contact condenser (DCC) for open-cycle ocean thermal energy conversion systems (OC-OTEC) have been conducted using seawater and exchanging up to 1.25 MW_th...

A Semi-Empirical Model for an OC-OTEC Spout Flash Evaporator
A phenomenological model for the thermal-hydraulics of a spout flash evaporator is presented in this paper. The model considers the two-phase flow behavior both in the spout and in the...

Decayed Timber Bridge Microcomputer Rating Program
National Bridge Inspection Standards (NBIS) require that capacity ratings for each bridge structure be established. This requirement includes timber bridges which are often decayed, have...

Model for Nonlinear Behavior of Bolted Joints Under Bending/Tension Loading
A mathematical model to predict the load-deformation relationship of single-bolted connections in wood structures subjected to bending/tension loading is described. The model accounts...

Iterative Global/Local Finite Element Analysis
In spite of the advances in computer technology, there is still a need for more computationally efficient methods for performing stress analysis. One approach which is receiving increasing...

The ENF Test: Critical Analysis and Computational Modelling
We have developed an experimental and computational strategy to moderate the experimental scatter of the interlaminar fracture toughness values (G_IIc)...

Applications of X-Ray Imaging in Soil Mechanics
This paper presents a summary of the principles of methods to observe the detailed patterns of local deformation within a soil mass: stereophotogrammetry, polaroscopy, infrared tomography...

Rate Effects in the Deformation of Rocks
This paper gives a brief review of creep and rate effects on the behavior of rocks, within a wide range of confining pressures and temperatures, and with a special emphasis on the physical...

A Microplane Constitutive Model for Soils
A microplane model for the inelastic behavior of soils is presented. The microscopic constitutive equations are defined independentely for a set of microplanes covering all possible orientations,...

Creep of Polycrystalline Ice
This paper discusses the extension of creep models for polycrystalline ice to include the effects of a non-monotonic loading history. Attention is focussed on cyclic loading since it is...

An Extended Mixture Approach for Modeling of Fiber Reinforced Cementitious Materials
A rate-independent, anisotropic model for Fiber Reinforced Cementitious Materials (FRCMs) is presented. A continuum damage/plasticity model for the concrete and an effective fiber model...

Thermomechanical Damage Due to Hydration in Large Concrete Dams
This paper presents the bases of a thermomechanical model able to describe the main evolution of concrete properties with aging. The model is based on the 'maturity'...

AE Instrumentation and Deconvolution Techniques
This paper describes the difficulties and solutions achieved in applying advanced Acoustic Emission (AE) signal analysis techniques to fracture mechanics. The test specimen is a double...

Displacement Measurement by Laser Interferometry and Image Analysis
Laser holographic interferometry was used for the evaluation of displacement fields on concrete and fiber reinforced concrete specimens. Transmission holography was used to analyze mortar...

Accurate Computation of Freezing Index
'Freezing index' (cumulative degree-days below freezing) is used for predicting frost penetration depths and modelling pavement performance. Contour maps which illustrate geographic trends...

Behavior and Strength of Telescopic Steel Shores
To study the load distribution between concrete floors and shores during construction, the non-linear axial load-shortening behavior of a single post shore must be modeled properly. In...

Stresses in Concrete Armor Units
This book is derived from a Seminar at the Waterways Experiment Station, Coastal Engineering Research Center, Vicksburg, Mississippi held on November 7-8, 1989. It presents a state-of-the-art...

Untangling A Can of Worms
Increasing traffic volumes combined with rush-hour delays and commuter complaints have spurred New York State DOT to improve the capacity of a major interchange near Rochester. The interchange,...

The Fine Print
An engineer who uses software, or supervises those who do, must know the laws regulating its purchase and use. Whether a company contracts for custom software, or leases, licenses or contracts...

Commuting Computing
Portable computers come in many different shapes and sizes and boast many of the same features as desktop machines. Unlike desktop PCs, however, the key to getting the most use out of...

 

 

 

 

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