Porous Pavement: Research, Development, and Demonstration
This paper discusses the U.S. Environmental Protection Agency's porous pavement research program along with the economies, advantages, potential applications, and status and...

Complete Triaxial Stress-Strain Curves for Concrete
A method to predict the ascending and the descending parts of stress-strain curve of concrete subjected to triaxial compressive stresses is presented. The proposed analytical stress-strain...

Estimates of Design Wind from Short Records
Wind speeds of various average return periods are estimated from the series of hourly mean wind speeds assumed independent. This hypothesis of independence is suggested by characteristics...

Buried Pipelines: Providing Flexibility at Structures
When differential settlements occur bmtween a structure and the connected buried piping, the pipe is subjected to longitudinal bending, and joints deflect. The length of the pipe section...

Limits for Practical Level-Basin Design
A previous solution for level basin design is expanded to cover a wider range of infiltration conditions. An analysis is performed to determine an approximate limit on basin length which...

Nitrification Kinetics and Its RBC Application
The surface reaction model for the mechanism of mass transfer-metabolism in the fixed-film nitrification process is investigated and discussed for the design of trickling filter systems...

Models of Landfill Leaching: Organic Strength
Mathematical models are applied to the dissolution, transport, and decay of organic materials in unsaturated sanitary landfills. The models are based on cascaded reactor concepts and on...

Algorithm for Optimal Activated Sludge Operation
A method for determining the minimum cost operation of an activated sludge wastewater treatment plant is developed and applied to a plant in Erie County, New York. The plant includes an...

Loadings for Electrical Transmission Structures
As the costs of high-voltage electrical transmission lines have increased, greater attention is being given to the weather element loads that influence the structure cost. Minimizing the...

Simplified Earthquake Analysis of Suspension Bridge Towers
Free vibration and earthquake response analyses of a simplified continuous analytical model representing suspension bridge towers (fixed at the base) are presented. In addition, various...

Dynamic Stability Boundaries for Shallow Arches
The interactive effects of multiple dynamic loads on the snap-through instability of shallow elastic arches are investigated. Impulse loads and step loads of infinite duration are considered....

Coastal Pollution from Septic Tank Drainfields
Wet weather and dry weather sampling is utilized to monitor densities of coliform bacteria in waters draining residential areas of coastal North Carolina. The bacterial levels are compared...

Predicting Future Water Demand
Decentralization within metropolitan areas has been a major aspect of population movement in the United States over the past two decades. This trend has great significance for all urban...

Stormwater Pollution Control: Best Management Practices
Nonstructural and elementary structural stormwater pollution control measures, known as best management practices (BMPs), are found capable of excellent urban runoff pollution control....

Heat Treatment and Anaerobic Digestion of Refuse
Alkaline heat treatment was evaluated as a pretreatment process for increasing the anaerobic digestibility of municipal refuse. The goal was an increased methane yield from refuse lignocellulose....

Acid Rain Model: Hydrologic Module
The acid rain model has been developed to simulate lake-watershed acidification processes. It provides a quantitative linkage between atmospheric deposition and lake water chemistry. The...

Crack Growth in Fiber-Reinforced Materials
Engineering models for initiation of crack growth, crack arrest, and the effective fracture toughness of fiber reinforced materials are developed. Emphasis is placed on brittle matrix...

Dynamic Characteristics of Frame-Wall Systems
The first three natural frequencies and the corresponding mode shapes for fixed-base frame-wall systems are presented. The system is modelled as a continuum of uniform properties incorporating...

Seismic Hazard Analysis of Lifelines
Methods for assessing the seismic safety of a lifeline system are developed; with part of the study being devoted to the development of a relation between the earthquake intensity and...

Body Wave Excitations of Embedded Hemisphere
Solutions of three-dimensional vibrations of an embedded hemispherical foundation are presented for excitation by incident plane P, SV, and SH waves with arbitrary angles of incidence....

 

 

 

 

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