Pre-tensioning in Construction

Concrete that has been prestressed so that the induced internal actions counteract the external loading to a desired degree.

To enhance bending capacity, shear capacity, and torsional capacity of flexural members, prevent concrete defects, and maximize the entire depth of flexural members under full loading.

P.H. Write in 1888.

<p>Combining high strength compressive properties of concrete with the high tensile strength of steel.</p> Signup and view all the answers

<p>General principles, classification and types, stages of loading, prestressed vs. reinforced concrete, partial prestressing, design codes.</p> Signup and view all the answers

<p>By preventing cracks at critical midspan and supports at service load.</p> Signup and view all the answers

<p>Ulrich Finsterwalder</p> Signup and view all the answers

<p>Walnut Lane Bridge</p> Signup and view all the answers

<p>stress-relieved wire and strand</p> Signup and view all the answers

<p>Gustave Magnel</p> Signup and view all the answers

<p>partial prestressing</p> Signup and view all the answers

<p>160 ft length, 50 ft height</p> Signup and view all the answers

<p>Equal to that of reinforced concrete</p> Signup and view all the answers

<p>1.6 times that of reinforced concrete</p> Signup and view all the answers

<p>In prestressed concrete, the entire section of the beam carries the load.</p> Signup and view all the answers

<p>Prestressed concrete</p> Signup and view all the answers

<p>Because it is lighter</p> Signup and view all the answers

<p>Because it requires many specialized equipments</p> Signup and view all the answers

<p>Cover large spans with minimum columns, economize building materials, require minimal maintenance, increase useful life, facilitate design with irregular geometry</p> Signup and view all the answers

<p>Require specialized labor and machinery, complex and expensive design calculations, susceptible to corrosion, higher cost due to unrecoverable anchors</p> Signup and view all the answers

<p>Unknown, Unknown</p> Signup and view all the answers

<p>Reinforced concrete uses ordinary mild steel or deformed bars, while prestressed concrete uses steel tendons and high tensile steel bars</p> Signup and view all the answers

<p>Extreme attention to ensure proper installation</p> Signup and view all the answers

<p>Facilitates design with irregular geometry</p> Signup and view all the answers

<p>Pre-tensioning applies tension to the tendons before casting the concrete, while post-tensioning applies tension after the concrete has been cast.</p> Signup and view all the answers

<p>Long term durability, crack-free concrete, greater load resistance, and optimal use of concrete and steel strengths.</p> Signup and view all the answers

<p>Requires high-quality dense concrete, expensive high tensile steel, costly tensioning equipment, good quality control, and supervision.</p> Signup and view all the answers

<p>Placement of tendons/conduits, casting of concrete, curing of concrete, applying tension to the tendon, and cutting of tendons.</p> Signup and view all the answers

<p>Post-tensioning allows for reducing the transversal dimensions of structural elements.</p> Signup and view all the answers

<p>To apply tension to the tendons and anchor them against abutments before casting the concrete.</p> Signup and view all the answers