May 30, 2006

The ATC-58 project: Development of next-generation performance-based earthquake engineering design criteria for buildings

Abstract: Under sponsorship of the Federal Emergency Management Agency, the Applied Technology Council is engaged in a multi-year effort to develop next-generation performance-based seismic design criteria. The criteria will be applicable to the...

May 30, 2006

Wind vibration analyses of giant magellan telescope

Abstract: The Giant Magellan Telescope (GMT) will be a 21.5-m equivalent aperture optical-infrared telescope located in Chile. The segmented mirror surface consists of seven 8.4-m diameter mirrors. The telescope structure will be inside a...

May 30, 2006

Prequalified connections for special and intermediate steel moment frames for seismic applications, ANSI/AISC 358-05

Abstract: Building code provisions for the seismic resistant design of structures incorporate two basic types of requirements. The first of these is very similar to the code requirements for most other types of loading and comprises specification...

May 30, 2006

Walls Still Growing Up: A Brief History of Building Technology

Abstract: Thousands of years ago, a primitive mortar helped transform a pile of stones into an enclosure of habitable space. Since then, a complex interweaving of technical and social change has continually redefined the way we build, culminating...

May 30, 2006

Design Optimization of Connections in Large Radio Telescopes

By: Daniel Valentine, Frank Kan, Joseph Antebi

Abstract: Optimization programs are used routinely in the design of precision structures such as radio telescopes, but design optimization is merely the beginning, rather than the end, of the process. After selecting appropriate member sizes for...

May 30, 2006

Update on Slip and Wear in Multi-Layer Azimuth Track Systems

By: Joseph Antebi, Juneja, Gunjeet, Frank Kan

Abstract: Many antennas, such as the 100-m Green Bank Telescope, use a wheel-on-track system in which the track segments consist of wear plates mounted on base plates. The wear plates are typically 2 to 3 inches thick and are case hardened or...

April 29, 2006

The performance of steel-frame buildings with infill masonry walls in the 1906 San Francisco earthquake

By: Ronald Hamburger, John Meyer

Abstract: Following the great 1906 San Francisco earthquake and fire, engineers recognized the superior performance of buildings with complete vertical load-carrying steel frames and infill masonry walls. These buildings were noteworthy in their...

April 29, 2006

Comparative seismic performance of four structural systems

By: Ronald Mayes, Craig Goings, Stephen Harris, Naguib, Wassim I.

Abstract: This paper provides a comparison of the maximum inter-story drifts and floor response spectra of both a three and nine story building each with four different steel structural systems - moment frame, buckling restrained braced frame,...

April 29, 2006

Seismic forces in diaphragm design

By: Ronald Mayes, Kevin Moore, Eatherton, Matthew, Naguib, Wassim I, Sabelli, Rafael, Boardman, Tom

Abstract: The 1994 Northridge Earthquake offered several instances of diaphragms and their components performing inelastically and even causing partial collapse, most notably in parking garages. While diaphragm failures are not widespread, it is...

April 29, 2006

Implementation of Higher Performance Structural Systems in the United States

Abstract: The development of more recent structural systems that perform better than standard moment frames, braced frames and shear walls occurred with the introduction of base isolation (1970's and 1980's), energy dissipation devices (...