ROBOSIM: A Simulation Package for Robots
ROBOSIM was developed first in a VAX environment. Using PC's with a terminal program capable of emulating a TEKTRONIX 4014, students can create robots, see them graphically,...
Design and Installation Concepts for High Capacity Pump/Turbines
This paper discusses the pre-planned field welding and machining operations utilized for six (6) large pump/turbines, each capable of 508 MW at Virginia Power Company's Bath...
AEC Experience with Expert Systems in Construction
The application of expert systems in the construction industry requires the use of general-purpose computers, such as microcomputers, minicomputers, and mainframes. The use of commercial...
The Cougar Project?Turbine Runner Replacement
The Cougar turbine runners have been subjected to a substantial amount of cavitation damage which has required repair by welding. The continued welding repair has subsequently resulted...
A Lesson in Repairing Cracked Kaplan Blades
Each of the three units that failed at Bonneville Lock and Dam started with a fatigue break and ended in a brittle fracture. Consequently, a comprehensive in-house weld procedure was developed...
Building the Seven Seas
The Brookfield Zoo's Seven Seas Complex, outside of Chicago, is a combination of the Caribbean and the Pacific Northwest. Completed in May 1987, the Seven Seas Complex consists...
Survey of Soviet Space Welding Technology Development
Soviet engineers clearly recognize the potential value of welding for maintenance, repair, and fabrication of structures in space. The development of this technology has followed a steady...
The Role of Welding in Space Maintenance and Repair
The nature of future space missions will result in increased incidence of degradation, damage, and wear of critical or expensive hardware. In many terrestrial applications welding provides...
Strengthening Old Floors
The floors of the historic City Hall and Courthouse in Minneapolis had withstood 80 years of hard use before they have to be analyzed and brought up to code. The building is about 300...
Fracture-Mechanics-Based Fatigue Life Estimate
Fatigue lives of tee-shaped weldments are estimated using fracture mechanics concepts and crack growth rate data. Fracture mechanics is used to develop an approximate expression for stress...
Fatigue Design Criteria for Welded Steel Details
A review of fatigue data and reassessment of the 1983 fatigue specification resistance functions has been conducted. Since the AASHTO specification fatigue resistance provisions were introduced...
Fatigue Strength of Welded Wire Fabric
Long life fatigue tests were made on 12 concrete slabs reinforced with large diameter, Grade 75, deformed welded wire fabric. The specimens simulated, to full scale, conditions in a bare...
Repair Welding of Arctic Offshore Structures and Vessels
This paper describes the welding procedure development for repair or field modifications of offshore drilling structures and vessels made with several different steel grades produced for...
Back on a Full Speed Track
A $30 million rehabilitation project is transforming a Massachusetts rail line that shows its age and poor maintenance history. Rehabilitating the line from Bristol County, Mass. to Hyannis...
It's Only Visual Inspection (Welding Inspection)
Unless specified otherwise in the Contract Documents, Visual Inspection will be performed on all fabrication/erection welding for projects that utilize the Specifications for the Design,...
Microcomputer Expert Systems for Welded Construction
Stone & Webster Engineering Corporation has developed expert systems including various applications within the field of welded construction. Systems have been developed in the...
Lift Bridge looks Like Sculpture
A lift bridge built in 1926 over the U.S. Canal at Kaukauna, Wis. was replaced by a sleek new lift bridge whose sculptured shape encloses all the machinery within welded steel box sections....
Unique Considerations in the Detroit DPM Foundation Design
Foundation design for the guideway of Detroit's Downtown People Mover (DPM) was influenced by a variety of unique considerations. Severe loading conditions were created by...
Analysis of Cracking of I79 Bridge at Neville Island
A large crack was discovered to form in a girder of the I-79 Glenfield Bridge over the back channel of the Ohio River near Pittsburgh on January 28, 1977. A section of the girder containing...
Girth Weld Defect Tolerance Criteria
This paper describes the following criteria proposed for setting allowable defect sizes in girth welds: PD 6493:1980, 'Guidance on Some Methods for the Derivation of Acceptance...
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