Post-Tensioned Concrete Fundamentals

Post-Tensioned Concrete Fundamentals - PartOne by...

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Fundamentals of Post Tensioned Concrete Design for Buildings Part One by John P. Miller, P.E.
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Fundamentals of Post Tensioned Concrete Design for Buildings – Part One A SunCam online continuing education course www.SunCam.com Copyright 2010 John P. Miller Page 2 of 49 Overview of This Course This is Part One of a two-part course that covers the fundamentals of post-tensioned concrete design for building structures using unbounded tendons. This course is a good introductory course for engineers new to post-tensioned concrete design and is a good refresher for experienced engineers. Part One should be taken before Part Two. By successfully completing this two-part course, you should be comfortable performing a preliminary design by hand and be able to quickly check a computer generated design or an existing design by hand. Part One gives a brief historical background and post-tensioned members are differentiated from pre-tensioned members. You will learn about the load balancing concept, hyperstatic moments, pre-stress losses, the basic requirements of ACI 318-08 (Building Code Requirements for Structural Concrete), and nominal flexure and shear capacities of post-tensioned members. In Part Two, several examples of structural systems commonly used in buildings and parking structures are worked, including a one-way slab, a two-way slab, and a continuous beam. Punching shear for two-way slabs, anchorage zone design, deflections, redistribution of moments, and torsion in beams are also covered. Several important practical issues, such as constructability and pour strips, are addressed. The user of this course material must recognize that pre-stressed concrete design is a very broad topic and that only certain fundamentals in a specific area are covered here in this course. It is not intended, nor is it possible within the confines of this course, to cover all aspects of pre-stressed concrete design. It is not intended that the material included in this course be used for design of facilities by an engineer who is inexperienced in pre-stressed concrete design without oversight and guidance from someone more experienced in this field. The author of this course has no control or review authority over the subsequent use of this course material, and thus the author accepts no liability for damages that may result from its use.
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Fundamentals of Post Tensioned Concrete Design for Buildings – Part One A SunCam online continuing education course www.SunCam.com Copyright 2010 John P. Miller Page 3 of 49 Pre-Stressed Concrete – Background and Definition Concrete as a building material has been around for thousands of years. Unlike other isotropic building materials such as steel, wood, and aluminum, concrete and masonry have a high compressive strength as compared to their relatively weak tensile strength.
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