December 30, 2004

Facade Ordinances and Historic Structures - Theoretical and Practical Conservation Issues in Inspection and Repair

By: CeCe Louie, Kecia L. Fong

The primary concern of building facade inspection ordinances is to insure the safety of the public and surrounding property and to establish baseline cycles of inspection, maintenance and repair. While public safety is paramount, what these...

November 29, 2004

Evaluation and Rehabilitation of Older, Circular Prestressed Concrete Tanks

By: Michael Brainerd, Sagan, Vincent E.

Abstract: The identification and rehabilitation of circular prestressed concrete tanks to increase their service lives by implementing tested standards such as ANSI/AWWA D110 and ACI 372 is discussed. A prestressed concrete tank is mainly a...

November 29, 2004

Building Science Helps to Improve Design

Abstract: Modern buildings are complicated assemblies complicated assemblies composed of multiple layers of lightweight materials. Consequently, these buildings behave very differently than the solid load-bearing masonry buildings of the past.|...

October 30, 2004

Water Vapor Transmission Through Brick Masonry Wall Systems

Abstract: Heat and moisture flow dynamics through masonry walls can vary greatly depending on wall construction and local climate. Recent concerns over mold and moisture damage to building envelopes have created a renewed need for designers to...

August 30, 2004

Relevance of Structural Engineers to Sustainable Design of Buildings

Abstract: Examination of building life cycle environmental impacts shows that the structural system can be a major contributor to overall environmental impacts. Although the structural impacts for most buildings in the United States and Canada...

August 30, 2004

Controlling Concrete Cracking and Curling

By: Matthew Sherman, Paul Kelley, Bae Jewan

Abstract: Drying shrinkage is a trait of concrete that, if poorly controlled or managed, can lead to serviceability problems, reduced durability, and even system failures. Cracks from restraint of shrinkage can reduce the performance life of...

August 30, 2004

Comparative Performance of Buckling-Restrained Braces and Moment Frames

By: Ronald Mayes, Craig Goings, Naguib, Wassim I., Stephen Harris, Lovejoy, Jennifer, Fanucci, Jerome P., Bystricky, Pavel, Hayes, John R.

Abstract: This paper will provide a comparison of the maximum inter-story drifts and floor response spectra for 3 and 9 story buildings using both steel and aluminum BRBs designed with an R-factor of 7. The buildings had the same dimensions as...

July 30, 2004

Development of next-generation performance-based seismic design guidelines

Abstract: The Applied Technology Council has initiated the ATC-58 project to develop next-generation performance-based seismic design guidelines applicable to the design of new buildings and upgrade of existing buildings. The guidelines will...

June 29, 2004

Slip and Wear in Multi-Layer Azimuth Track Systems

By: Frank Kan, Joseph Antebi

Abstract: Many antennas use wheel-on-track systems in which track segments consist of wear plates mounted on base plates. The hardened wear plates are typically connected to the base plates using bolts, and the base plates are supported on grout...

June 29, 2004

Replacement of Elevation Structure to Upgrade Haystack 37-m Radio Telescope

By: Joseph Antebi, Frank Kan

Abstract: Haystack, MIT's 37-m radio telescope, was built in the early 1960s. At the time considered to be a high-performance antenna, Haystack produced a number of outstanding scientific results. The antenna, originally designed to operate...