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...

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...

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

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

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...

June 29, 2004

Evaluating Existing Plaza Waterproofing Systems

Abstract: Reconstructing a plaza deck is often expensive because it involves removing and replacing such overburden elements as paving, plants, soils, and other landscaping features. Access to the plaza for reconstruction work can be difficult...

June 1, 2004

Design for Deconstruction

By: Christopher Hewitt, Michael Horman, Ph.D., Bradley Guy

Designing for deconstruction or disassembly is an important part of green design and the closed-loop building materials cycle. Material waste produced from new construction, renovation and demolition is 25%-30% of the total waste produced each...

May 30, 2004

Leak-tracking techniques: how to find non-roof related leaks

Abstract: When is interior water damage not the result of a roof leak? Wall leaks, plumbing leaks, and condensation can be interpreted as coming from the roof. How do you find the source? Visual examinations of interior and exterior surfaces...

May 30, 2004

Slate and Clay Tile Roofing Defy Father Time

On older roofs, high-quality clay tile or natural slate frequently outlast the original metal flashings and roofing underlayment, for example, asphalt-saturated felt paper that help to make the roof watertight. The question frequently facing...