PTI DC20.8 - Design of Post-Tensioned Slabs Using Unbonded Tendons
February 1, 2004 - PTI

INTRODUCTION In many parts of the country, post-tensioned concrete slabs with unbonded tendons have become the preferred choice for floor systems in both commercial and residential buildings. The two most popular systems are one-way slabs spanning between parallel beams placed between column...

PTI DC80.1 - Controlled Demolition of an Unbonded Post-Tensioned Concrete Slab
January 1, 2002 - PTI

INTRODUCTION Several references are available which describe the demolition of bonded post-tensioned concrete structures (Felstead et al, 1981, Buchner et al, 1985). The National Association of Demolition Contractors (NADC. 1981) has issued a demolition safety manual for special structures...

PTI DC20.7 - Design, Construction, and Maintenance of Cast-in-Place Post-Tensioned Concrete Parking Structures
March 1, 2001 - PTI

Introduction This manual was developed to provide a comprehensive reference for the design, construction, and maintenance of free-standing, cast-in-place concrete parking structures. The emphasis of the manual is on design, construction, and maintenance practices that will ensure long-term...

PTI DC20.6 - Design Fundamentals of Post-Tensioned Concrete Floors
April 1, 1999 - PTI
A description is not available for this item.
NEMA DC 20 - Residential Controls - Class 2 Transformers
January 1, 1992 - NEMA

This Standards Publication covers Class 2 transformers intended primarily for use in 30 volts rms maximum low-voltage residential control circuits. It includes definitions, electrical ratings, performance standards, mounting dimensions, and marking requirements.

PTI DC20.4 - Earthquake Performance of Unbonded Post-Tensioned Buildings
August 1, 1990 - PTI

INTRODUCTION One of the strongest earthquakes ever to hit California shook hundreds of post-tensioned buildings on October 17, 1989, with an intensity of 7.1 on the Richter scale. The earthquake, named Loma Prieta, had its epicenter approximately 65 miles southeast of downtown San Francisco (Figure...

PTI DC20.5 - Evaluation of the Condition of a Post-Tensioned Concrete Parking Structure After 15 Years of Service
January 1, 1990 - PTI

INTRODUCTION In the summer of 1989, a parking structure adjoining an office building in the Inner Harbor area of downtown Baltimore, Maryland, was demolished to make room for an expansion to the existing office tower. This post-tensioned concrete parking structure was built in 1974, and thus, had...

PTI DC20.3 - Structural Integrity of Buildings Constructed with Unbonded Tendons
March 1, 1989 - PTI
A description is not available for this item.
NEMA DC 5 - Residential Controls - Surface-Type Controls for Electric Storage Water Heaters
January 1, 1989 - NEMA

This Standards Publication applies to surface-type control thermostats and temperature-limiting controls for electric storage water heaters.

PTI DC20.2 - Restraint Cracks and Their Mitigation in Unbonded Post-Tensioned Building Structures
January 1, 1988 - PTI

INTRODUCTION Most concrete structures develop cracks for one reason or another. In most cases, cracks do not impair the expected performance of the structure. Some cracks, on the other hand, may be detrimental by leading to excessive deflections, exposure to corrosive environment, and possibly...