Reshoring and Early-Age Building Behavior-Post-Tensioning Effects on Shoring and Reshoring (PDF)

Post-Tensioning Effects on Shoring and Reshoring (PDF)

Pdf Summary

The document "Post-Tensioning Effects on Shoring and Reshoring" by Mary Bordner Tanck, PE from Bordner Engineering Services, LLC discusses the importance of considering post-tensioning transfer in construction to prevent overload and overstress in structural components. It emphasizes that large linear and point loads induced by post-tensioning can overload shores and reshores if these loads are neglected, leading to potentially overstressed floors. <br /><br />The document outlines a slab/beam/girder system where slab loads transfer to beams, beam loads to girders, and girder loads to columns, assuming negligible structural deflections. A simplified method is suggested that ignores axial shortening of shores and reshores but stresses that structural members reach their full capacity only when fully tensioned.<br /><br />A schematic example shows load calculations, laying out the process for a beam receiving a combined load from a slab and beam stem resulting in a total induced load. For reshore under beams, previous calculations are used with design live loads and dead loads factored in. Additionally, the total point load at the beam/girder intersection is detailed, considering tributary area, slab weight, and other structural components to reach a final load value.<br /><br />Further calculations for reshoring consider the anticipated loads and capacities at intersections, relevant to construction practices using timber shoring. The document refers to various resources for deeper understanding, including the ACI 347.2R-17 guide for shoring/reshoring and several works on post-tensioned concrete design.<br /><br />Overall, the document emphasizes careful load calculations and planning in post-tensioning to ensure structural integrity and safety in multistory concrete buildings.

Keywords

post-tensioning

shoring

reshoring

structural integrity

load calculations

construction safety

beam girder system

overload prevention

post-tensioned concrete

structural components