May 30, 2006

Design Optimization of Connections in Large Radio Telescopes

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

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 (...

April 29, 2006

The Role of the NEHRP Provisions in Supporting Seismic Design Provisions in Building Codes and Standards

Abstract: For more than 20 years, the Building Seismic Safety Council, under the sponsorship of the Federal Emergency Management Agency, has developed, maintained and updated the National Earthquake Hazard Reduction Program Provisions for...

April 29, 2006

100 Years of Earthquake Engineering - Lessons Learned and Forgotten

By: John Meyer, Ronald Hamburger

Abstract: During the 100 years since the 1906 San Francisco earthquake engineers have learned to design buildings that will perform well in earthquakes and to do it with a reasonable level of confidence. However, through forgetting lessons...

April 29, 2006

ATC-58 Project Overview: Development of Next-Generation Guidelines for Performance-Based Seismic Design of Buildings

Abstract: Design procedures for seismic resistance contained in building codes are intended to enable buildings to provide acceptable levels of performance in earthquakes, but the procedures are not truly performance-based. These procedures...

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,...

March 30, 2006

Reconstructing the Bernie King Pavilion

Abstract: A longstanding and excellent client called with a unique problem. The Metropolitan District Commission (MDC) was charged with maintaining the Bernie King Pavilion. Built in the late nineteenth century, the structure is an open pavilion...

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