Prefabricated bridge components are in increasing demand for accelerated bridge construction. Precasting eliminates the need for forming, casting,and curing of concrete in the work zones, making bridge construction safer while improving quality and durability. Precast bridges consisting of pretensioned girders, post-tensioned spliced girders, trapezoidal open box girders, and other types of superstructure members are often used for accelerated bridge construction; however, bridge engineers are concerned with the durability and performance of bridges made of precast members in areas of high or moderate seismisity. This paper examines the applicability of the AASHTO LRFD Specifications to precast prefabricated bridges in areas ofhigh or moderate seismisity, discusses the different seismic design methodologies, and provides guidance in their application to precast bridges. It provides an overview of Washington State Department of Transportation (WSDOT) design criteria and recent research and bridge projects using the accelerated bridge construction technique in Washington State.
Samenvatting