Chaotic Analysis of Dynamic Bifurcation of Viscoelastic Shallow Arches
Periodic and chaotic motions in a mathematical model of an imperfect, viscoelastic shallow arch under a dynamic sinusoidal load for both the symmetric and the coupled unsymmetric responses...
A Second Order Analysis Technique for Nonprismatic Bridge Piers
An approximate second order method is presented for the analysis and design of cantilever compression members. Prismatic members with nonconstant reinforcement, and nonprismatic members...
Testing the Limits
More than 100,000 bridges in the U.S. are considered structurally deficient and in need of posted load limits or repair. As the number continues to mount, engineers search for a better...
Inspection Goes High Tech
Many believe that rehabilitation of the existing infrastructure�not net construction�will dominate the 1990s. Therefore, accurate condition assessment is crucial, since public works agencies...
Cables Not in Trouble
Cable-stayed bridges in the U.S. are not, contrary to reports widely disseminated in the press several years ago, about to fail from corrosion. The design, in which primary cables support...
The Great Canadian Bridge Slide
An aging multispan swing bridge had to be replaced in Trenton, Ont., with minimal interference to both river and road traffic, and without changing its alignment. The solution was to build...
Probing the Golden Gate
The Golden Gate Bridge has just come through the most detailed analysis ever attempted in its 53-year-old history. This analysis was squeezed into a desktop computer that calculates twice...
Effects of Uplift on a Gravity Arch Dam
This paper evaluates the behavior of a gravity arch dam when subjected to normal static loads and internal hydrostatic pressure (uplift). The ability to model uplift has become necessary...
Hatchie River and Schoharie Creek Bridge Failures
Within a 2-year period two large bridges collapsed into flooded rivers resulting in a total of 18 people plunging to their deaths. Both bridges had been inspected by probing, but had not...
Bridge Scour Vulnerability Assessment
Although the failure of the New York Throughway bridge over Schoharie Creek in 1987 has focused national attention on scour related failures, other failures reinforce the need for implementing...
Bridge Inspections Related to Bridge Scour
The failure of the Silver Bridge over the Ohio River in Point Pleasant, West Virginia, on December 15, 1967 resulted in the establishment of the National Bridge Inspection Standards (NBIS)...
A National Bridge Scour Data Collection Program
A study to collect and analyze field measurements of bridge scour is being conducted by the U.S. Geological Survey in cooperation with the Federal Highway Administration. The primary objective...
The Design of Scour-Safe Bridges
Two new highway systems, the East Papago and the Pima freeways, are currently under design and construction within the Phoenix, Arizona, metropolitan area. Both of these highways will...
Scour Measuring and Monitoring Equipment for Bridges
The National Cooperative Highway Research program (NCHRP), through the Transportation Research Board (TRB) of the National Academy of Sciences, is currently sponsoring a research effort...
Bridge Scour and Stream Instability Countermeasures
Stream instability is characterized by lateral or vertical instability. Such instability has led to the failure of bridges and loss of life. Lateral instability is caused by lateral migration...
Bridge Scour Research Needs
This paper presents a summary of the Federal Highway Administration (FHWA) priority research emphasis on bridge scour, sedimentation, and stream stability problems. The most persistent...
Model Studies on Local Scour
In this investigation, the scaling procedure of a scour model in the laboratory has been indicated. The results have been compared with the prototype data....
Liabilities in Temporary Structures Failures?Representative Case Histories
Eight case studies involving construction accidents caused by failure of temporary structures are presented. These studies illustrate the oftentimes unintended consequence of utilizing...
FHWA'S Bridge Temporary Works Research Program
The Federal Highway Administration (FHWA) has developed a research program to address bridge falsework design and construction. This resulted from the collapse of the Route 198 bridge...
Permanent Structure as Part of the Underpinning System for Boston's Central Artery
The Central Artery, a major six lane structural steel viaduct, has been one of Boston's most significant roadways over the past three decades. Increasing congestion, accidents,...
Return to search