Title:
Safety Criteria in Construction of
Segmental Bridges
Author(s):
Andrzej, S. Nowak, and Hid N. Grouni
Publication:
Concrete International
Volume:
4
Issue:
10
Appears on pages(s):
80-86
Keywords:
bridges (structures); cantilever bridges;
concrete construction; loads (forces); precast con-crete;
prestressed concrete; safety factor; structural
design.
DOI:
Date:
10/1/1982
Abstract:
Deals with development of design criteria for construction of segmental bridges erected as unbalanced cantilevers. During erection, the segments of such structures are placed alternately on each side of a pier, forming two cantilevers. Under unbalanced conditions, stability is a major consideration. Self-weight of segments is found to be a dominating load in calibration. The vertical prestressing force applied through the pier segment into the pier is treated as a stabilizing effect controlled by design. Safety is measured in terms of the safety index. Load factors are calculated to provide for a satisfactory safety level during construction. The calibration procedure is demonstrated on two typical segmental bridges, a cast-in-place bridge and a precast bridge. The results may be applied to segmental bridges erected by other methods of construction.*