Advanced Prestressed Concrete Part 3: Bearing on Concrete and Dapped End Design-Advanced Precast, Prestressed Concrete Module 3: Bearing and Dapped Ends

Advanced Precast, Prestressed Concrete Module 3: Bearing and Dapped Ends

Pdf Summary

This document is a course overview for an advanced prestressed concrete design course. The course is divided into six sessions, with Session 3 focusing on bearing on concrete and dapped end design. After completing this session, participants should be able to check the bearing strength of concrete for unreinforced and reinforced cases, understand the failure mechanisms and load transfer characteristics of dapped ends, and apply design procedures specific to dapped ends with an emphasis on proper detailing for adequate performance.<br /><br />The document provides equations and figures related to bearing strength on plain concrete and the design of bearing on reinforced concrete. It discusses the need for reinforcement to arrest potential cracks and provides examples of cracking at bearing locations and reinforcement needed. The concept of shear friction is explained, including the development of friction resistance and the use of shear friction reinforcement.<br /><br />The document also covers the design of dapped ends, including the use of strut-and-tie models, identification of B and D regions, and various reinforcing schemes. It presents the findings and recommendations from research on thin-stemmed dapped ends, including the need for additional reinforcement to address diagonal tension failures. The document concludes with the recommendations and requirements for the design of dapped ends in both non-thin and thin-stemmed components.<br /><br />The course overview ends with a design example that illustrates the use of the design principles and equations discussed in the document. The design example includes the calculation of design forces, the selection of reinforcement, and the layout of end reinforcement for a double tee structure.<br /><br />Overall, the document provides a comprehensive overview of the design principles and considerations for bearing on concrete and dapped end design in prestressed concrete structures.

Keywords

advanced prestressed concrete design

course overview

Session 3

bearing on concrete

dapped end design

bearing strength

failure mechanisms

load transfer characteristics

design procedures

shear friction