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Nonlinear Deformation and Bispectral Change of Random Gravity Waves on Sloping Bed
A WKB-perturbation method is applied to the deformation of random gravity waves in water of slowly varying depth. In the present analysis, a spectral representation of WKB-type is assumed...

Rock Masses
Modeling of Underground Openings/Probability of Slope Failure/Fracture of Intact Rock
While soil mechanics has been the dominant interest of Civil Engineers since Karl Terzaghi's recognition of the principle of effective stress, rock mechanics is becoming increasingly...

Staggered Truss Adapted to High Rise
The 34-floor Nashville Convention Center Hotel required a structural system that would overcome the tendency to vibrate in the wind. The solution was a modified staggered frame truss,...

Building in Space
Work on the nation's first permanently manned space station has begun. Almost $200 million in contracts for conceptual design for the station were awarded by the National...

Effect of Shallow Trench Construction on Cast Iron Pipelines
This paper summarizes the results of three-dimensional finite element analyses to evaluate the strains and displacements sustained by 4, 6, and 8-in. (100, 150, and 200 mm)-diameter cast...

Bending Moment of Underground Flexible Pipes in a Centrifuge
The effect of several factors on bending moment of an underground flexible pipe section buried in a ditch with sheet piling was investigated experimentally by means of centrifugal model...

Field Burial Tests of Corrugated Double Wall PVC Pipe
A new lightweight PVC pipe, consisting of a smooth inner wall and a corrugated outer wall, has been introduced in the U. S. sanitary sewer market in 4 through 10 in. diameters. Field burial...

Investigation of the Long-Term Creep Modulus for Buried Polyethylene Pipes Subjected to Constant Deflection
The tests reported in this paper are simulating the stress relaxation in constantly deflected pipe rings of various high density and medium density polyethylene grades. The pipe rings...

Long Term Deflection of Buried Plastic Sewer Pipes
During the 70's and the early 80's a research program has been carried out in Sweden regarding the long term behaviour of buried plastic pipes. The program has...

Determining the In-Place Density of Soils Using the Sleeve Method
The sleeve method of determining the in-place density was developed by Bureau of Reclamation field personnel for cohesionless, fine, gravel soils used for pipe bedding when other methods...

Numerical Simulation of Soil-Pipeline Interaction in a Ground Subsidence Zone
In this paper, the flexural interaction between a buried pipeline and the surrounding soil is examined by employing a combined boundary element-finite element scheme. The flexural interaction...

Field Testing of 84-Inch-Diameter Plastic Pipe
During the summer of 1981, a research project was initiated to monitor strains and deformation in 84-inch diameter RPM (reinforced plastic mortar) pressure pipe. Three 20-foot (6. 1-m)...

Microcomputers in Domestic Water System Evaluation
Water system hydraulic network analysis can be accomplished rapidly and accurately using microcomputer systems affordable by engineering firms and staffs of major water utilities. Simulations...

Vertical Transport of Fine-Grained Sediments in Suspensions
Numerical-model sensitivity studies were made to determine the effect of bed flux on the vertical distribution of fine-grained material suspended in turbulent flow. The transport equation...

Real-Time Monitoring and Flood Forecasting in Harris County, Texas
A new automated flood warning system is now serving the 2,700,000 residents of Houston, Harris County, Texas. Real-time rainfall and river level data from more than 90 sensors are automatically...

Application of Geographic Information System for Hydrologic Investigation
The Illinois Department of Energy and Natural Resources is developing a geographic information system (GIS) under the federally funded Lands Unsuitable for Mining Program (LUMP). This...

Using Remotely Sensed Data to Estimate Runoff
The paper reports on a study to conduct numerical experiments to simulate runoff from watersheds by using remotely sensed data and hydrologic models. Data from the Sugar Creek Watershed...

Interfacing Groundwater Data Collection with Microcomputers
Advances in microcomputer based instrumentation have provided new techniques by which groundwater data may be collected and analyzed. The authors have used microcomputer based systems...

Data Base Development and Analysis for Water Distribution Systems
There have been a number of studies estimating the costs of repairing, replacing, or renovating aging distribution networks. Although useful in general terms, characterizing a system by...

Reliability Analysis of Water System Capacity
The paper presents, by means of an application, a few promising analytical methods for estimating bulk water system capacity reliability. In particular, this paper examines the applicability...

 

 

 

 

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