Fracture Analysis of Cracking in Concrete Beams
An energy balance criterion, based on fracture mechanics concepts, is proposed for predicting the loads at which concrete members develop rapidly propagating cracks. After an initial period...

Statistical Combination of Extreme Loads
As most loads on buildings and structures are stochastic in nature, an analytical method for studying load combination is presented in which the loads are treated as random processes....

Time-Dependent Behavior of Undisturbed Clay
Time dependence of undrained stress-strain and strength behavior of a natural sensitive marine clay has been investigated with particular reference to the effects of strain rate, strain...

Speed of Inertial Bed Load Disturbances
The flow of water on a movable bed is studied by the method of characteristics. The equations of motion and continuity for water and bed load are considered separately. A relation between...

Projections of Phosphorus Levels in White Lake
A preliminary mathematical model of phosphorus was used to evaluate different lake rehabilitation schemes for improvement of water quality in White Lake, Michigan. Model calculations indicate...

Nonuniform Flow in Aggrading Channels
The problem of resistance to flow and sediment transport rate under nonuniform flow conditions obtained in aggrading channels has been investigated experimentally. Manning's...

Biological Energy Recovery Using Dairy Cow Waste
Laboratory research which applied anaerobic digestion to dairy manure was concerned with optimizing gas production for potential energy recovery. The digesters were operated successfully...

Laboratory Model Testing for Earthquake Loading
Two types of facilities used at the University of California, Berkeley, for laboratory syudy of earthquake response characteristics of typical structures are described: (1)A 20-ft square...

Measurements of Sediment Transport Rates using Radioactive Tracers

Weak Sediment Transport
The bed load rate per unit width and unit time, gs, is in newtons per meter per hour, can be expressed...

Discharge Equations for HS, H, and HL Flumes
Generalized discharge equations for HS and H flumes were developed from the original data. Discharge equations for the HL flume were developed from a published rating table for a 4-ft...

Models for Evaluation of Hazardous Wastes
The problems encountered in the development of models for the quantification of the degree of hazard to the environment of waste streams are examined. With the aid of a numerical example,...

Strain Rate Behavior of Compacted Silt
Strain controlled triaxial tests of the consolidated-drained type on compacted samples of a clayey silt show that the deviator stress at failure increases with increasing rate of axial...

Contribution to Selection of Railroad Ballast
Laboratory classification of 10 railroad ballasts used in a CNR field test is given. The 10 ballasts are rated for their field performance from the CNR test report. Each ballast is rated...

Multiple Criteria Theory and Airport Site Evaluation
This paper presents the application of multiple criteria decision theory to the selection of a new airport site. Utility values for various criteria are developed using ranking and rating...

Endochronic Theory of Inelasticity and Failure of Concrete
A gradual accumulation of inelastic strain can be most conveniently described in terms of the so-called intrinsic time, whose increment depends on the time increment as well as the strain...

Evaluation of Circulation in Estuaries
Several approaches describing density-induced circulation patterns in partially stratified estuaries have been developed. Published techniques developed by several investigators and recently...

Some Remarks on Computer Modeling of Coastal Flows
Limitations on ability of numerical models to model flow and dispersion of pollutants in coastal areas due to fundamental limitations in knowledge of exchange coefficients are covered....

Rating and Reliability of Railway Bridges

The Bed-Load Function
A simple derivation of the bed-load function has been presented. It was shown that the jump length of detached particles need not be assumed constant, and by treating it as a random variable,...

 

 

 

 

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