Advanced Prestressed Concrete Part 2: Ledge Design-Advanced Precast, Prestressed Concrete Module 2: Ledge Design

Advanced Precast, Prestressed Concrete Module 2: Ledge Design

Pdf Summary

The document discusses the design of prestressed concrete ledges in spandrel beams. The objective is to avoid local punching shear failure in the ledge. The design method used is based on extensive laboratory experiments and finite element simulations. The research covered a range of ledge dimensions, concrete strengths, and reinforcing details.<br /><br />The design equations for ledge shear strength are presented, considering factors such as ledge height, transverse bending, and longitudinal bending. The equations are based on different failure scenarios, with overlapping or non-overlapping failure surfaces. The design method in the PCI Design Handbook (8th Edition) is compared to the previous edition, showing that the newer method is closer to test results and more conservative.<br /><br />The document also discusses the reinforcement requirements for transverse bending and longitudinal bending of the ledge, as well as the design of hanger steel. The modification factor for hanger steel design is discussed, with equations provided for L-beams and inverted tee beams.<br /><br />The session concludes by summarizing the topics covered in the first two sessions of the course and inviting questions from participants.

Keywords

prestressed concrete ledges

spandrel beams

punching shear failure

design method

reinforcing details

ledge shear strength

transverse bending

longitudinal bending

PCI Design Handbook

hanger steel