State of the Art
The structural engineering of San Francisco's new Museum of Modern Art offered many challenges to the engineer. The complexity of the building is both visually exciting and...
Ready for Anything
The author describes the temporary bridge developed by Caltrans for use in emergency situations where stretches of highway bridge are damaged. The bridge is made of salvaged railroad flatcars...
Seismic Isolation in Bridges
In the U.S., the use of seismic isolation in new bridge construction and retrofit projects has been growing as awareness of seismic risk has spread across the country since the 1971 San...
Aftershocks: The Legacy of Loma Prieta
It wasn't the fabled Big One--quite--but it came close enough. The Magnitude 7.1 Loma Prieta earthquake that struck just after 5:00 p.m. on October 17, 1989 killed 63 people...
Effects of Force Reflection on Telerobotic Performance
The University of Kansas Augmented Telerobotics Laboratory conducted a study to examine the effects of force reflection on telerobotic system and operator performance in performing two...
A Mobile Robot for Reconnaissance of HAZMAT Incident Sites
First entry into situations where hazardous materials have been accidentally spilled or released is extremely dangerous. Often the type of material, its exact location, and the extent...
URSULA: Design of an Underwater Robot for Nuclear Reactor Vessel Inspection
This paper describes the development of an underwater robotic system that will be used to perform ultrasonic inspections of nuclear reactor vessel weldments. The development effort consists...
Allowable Design Loads for Marman Clamp Systems
Marman clamp separation systems have many aerospace applications. One of their most important applications is in the attachment of spacecraft to expendable launch vehicles. Because their...
Development, Testing and Modeling of Ceramic Composites for Lunar Applications
The procedure referred to as thermal liquefaction allows production of Intermediate Ceramic Composites (ICC) from lunar simulants with various admixtures. For their use as structural materials...
Implementation of a Viscoplastic, Kinematic Hardening Constitutive Model for Impact Prediction
This paper reports on a preliminary study to determine the significance of the Bauschinger effect on modeling impact and other large deformation events. Such events have significant implications...
Erectable Truss Hardware for Large Space Structures
The KATLOK connector is a truss structure connector that was designed to be compatible with manual assembly by an astronaut in an extra-vehicular activity (EVA) suit, telerobotic assembly...
In-situ Extraction of Lunar Soil Volatiles
Techniques for their recovery and utilization of the potentially valuable solar-wind elements embedded in the lunar regolith have been proposed. In order to acquire quantities of 3He...
TOPAZ II Qualification and Nuclear Testing Program
This paper presents an overview of the Topaz II qualification and nuclear test program. The program combines the joint efforts and resources of Russian and American specialists and organizations...
Science Operations and Engineering Impacts to Lunar Outpost Design
Recent work by scientists and engineers at the Johnson Space Center ha led to a better understanding of the requirements and interfaces needed at an initial lunar outpost to enable scientific...
Engineering Implications of Levitating Lunar Dust
In this paper an attempt is made to provide a physical understanding of these various phenomena and their long-term effects on the lunar environment. This understanding is then applied...
Very Low Frequency Radio Astronomy from Lunar Orbit
This paper discusses the use of very low frequency aperture synthesis as a probe of astrophysical phenomena. Specifically, the science achievable with the Lunar Observer Radio Astronomy...
Preserve and Protect
Historic and landmark structures constructed of unreinforced masonry and stone are among the most vulnerable to strong ground shaking and are often subject to possible collapse. For the...
The Inelastic Response of an Offshore Platform in Hurricane Andrew
Amoco's Gulf of Mexico South Timbalier 161A platform took a direct hit from Hurricane Andrew in August of 1992, experiencing loads which far exceeded its design load. The platform had...
Concrete Buildings in Regions of High Seismicity
Structural systems for multistory concrete buildings in regions of high seismicity are reviewed. The suitability and certain practical aspects of the systems are discussed. A Uniform Building...
Seismic Design of RC Structural Walls with Unsymmetrical Cross-Sections
An overview of seismic design issues and current experimental research for walls with unsymmetrical cross-sections is presented. The experimental studies include approximately 1/4 and...
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