Title:
Prestressed Concrete Girder with Multistage
Prestressing Concept
Author(s):
Man Yop Han, Eui-Seung Hwang, and Chadon Lee
Publication:
Structural Journal
Volume:
100
Issue:
6
Appears on pages(s):
723-731
Keywords:
girder; prestressed concrete; test.
DOI:
10.14359/12838
Date:
11/1/2003
Abstract:
Prestressed concrete (PSC) I-type girders are widely used in short- and medium-span bridges. Prestressing in traditional PSC girders is usually applied once at the beginning stage of construction. The magnitude of the prestressing force is limited within allowable stresses at various construction stages. Consequently, for longer spans, a larger sectional depth is required. To achieve more economical PSC girders in terms of a reduced girder depth for a given span or a longer span for a given girder depth, the method of multistage prestressing at different loading stages is introduced. Theoretical expressions for stresses at each loading stage are developed and experimental verification is made through two full-scale flexural tests. From parametric studies and test results, it was observed that the developed girders satisfied the requirements for the strength and ductility and can be an economical alternative to other types of PSC girders for long-span bridges.