Laboratory Evaluation of Concrete Ties and Fastenings for Transit Use.

摘要

This report was prepared as part of an ongoing research effort by the Urban Mass Transportation Administration (UMTA) to develop standard concrete ties for rapid transit use. The overall objective of this contract was to fabricate and evaluate,by laboratory tests,standard ties of different designs intended for transit use. Two tie designs, a pretensioned monoblock and a post-tensioned two-block,together with preliminary specifications for tie manufacture were developed in an earlier study by the Transit Development Corporation. Objectives of the investigation were to evaluate,by laboratory tests,the adequacy of:each of three fastening systems;each of the tie designs;and the assembled track components with ties supported on ballast and subjected to simulated rapid transit loading. Work performed to accomplish these objectives included fabrication of prestressed concrete ties and testing of ties,fastenings,and assembled track components.