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原文传递 Shear Behavior of Ultrahigh-Performance Concrete Pretensioned Bridge Girders

题名：	Shear Behavior of Ultrahigh-Performance Concrete Pretensioned Bridge Girders
正文语种：	eng
作者：	El-Helou, Rafic G.;Graybeal, Benjamin A.
作者单位：	Turner Fairbank High Way Res Ctr Genex Syst 6300 Georgetown Pike Mclean VA 22101 USA;FHWA Turner Fairbank Highway Res Ctr Bridge Engn Res Mclean VA 22101 USA
关键词：	Beam shear behavior;Prestressed concrete;Pretensioned bridge girders shear capacity;Shear testing;Ultrahigh-performance concrete (UHPC)
摘要：	Because of their tensile strain-hardening characteristics, ultrahigh-performance concrete (UHPC) materials offer significant advantages in terms of beam shear capacity and postcracking behavior compared to conventional reinforced-concrete beams. These advantages rely on UHPC's ability to sustain its strain-hardening characteristics at the structural level. This paper reports the results of an experimental investigation on the parameters influencing the structural shear behavior of prestressed UHPC bridge girders. Six pretensioned bulb-tee UHPC bridge girders were tested in shear with the following test variables: the UHPC material properties, the girder height, the web thickness, the number of prestressing strands, and the presence of discrete transverse steel reinforcement in the web. The average relationship between the principal stress and strains in the web was monitored during the tests and compared to behavior obtained from uniaxial tests. The shear behavior and capacities of the tested girders were observed to be largely dependent on the tensile characteristics of UHPC. The results demonstrate UHPC's capability to sustain its strain-hardening characteristics at the structural scale and highlight the importance of the crack localization strain, corresponding to the end of the tensile hardening behavior, to the global shear performance of UHPC girders.
出版年：	2022
期刊名称：	Journal of structural engineering
卷：	148
期：	4
页码：	04022017.1-04022017.13