Ward R. Malisch Concrete Construction Symposium (Part 2)-Why Are As-Built Measurements Important (PDF)

Why Are As-Built Measurements Important (PDF)

Pdf Summary

The document provides an overview of discussions and topics from the Concrete Convention and Exposition, focusing primarily on structural safety and the importance of as-built measurements in concrete construction. Bruce A. Suprenant, Technical Director of the American Society of Concrete Contractors, highlights several key elements necessary for ensuring the structural safety of concrete constructions. These include understanding the variability in resistance and loadings, considering the consequences of potential failures, and using appropriate safety factors to manage these risks.<br /><br />A significant portion of the text emphasizes the role of construction tolerances, which are essential for accommodating permissible variations in dimension and location during project execution. The document references several publications and past documents, like the 1963 ACI Building Code and more recent ACI guidelines, indicating how these standards have evolved to better deal with variability in material strengths and construction dimensions. These established tolerances help both designers and contractors adhere to a framework that ensures safety and structural integrity.<br /><br />The use of probability and simulations, such as Monte Carlo analyses, is also mentioned as methods to evaluate structural resistance and reliability. The importance of strength reduction factors is emphasized, serving four primary purposes: to account for material and dimensional variabilities, design equation inaccuracies, available ductility and reliability, and the significance of different structural components.<br /><br />Furthermore, the document briefly addresses current and upcoming challenges in the field, such as the need for more comprehensive as-built data and the potential future concern of managing excessive data. The conventions appear to provide a platform for continuous enhancement of construction practices by sharing knowledge, tools, and evolving standards critical for improving structural safety.

Keywords

Concrete Convention

structural safety

as-built measurements

construction tolerances

Monte Carlo analyses

strength reduction factors

Bruce A. Suprenant

ACI guidelines

structural resistance

construction practices