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原文传递 Fatigue and Shear Behavior of HPC Bulb-Tee Girders. Final rept.

题名：	Fatigue and Shear Behavior of HPC Bulb-Tee Girders. Final rept.
作者：	BRUCE, R. N.; ROLLER, J. J.; RUSSELL, H. G.
关键词：	Bridges-Structures; Shear-strength; Girders-; Fatigue-.;High-strength-concrete; Prestressed-concrete; Concrete-durability; Concretes-; Welded-wire-fabric; Concrete-reinforcement.
摘要：	Five 96- ft. (29.3- m) long, 72-in. (1.83-m) deep, precast, pretensioned bulb-tee girders were tested to evaluate their behavior under flexural fatigue. Three of the girders were also tested to measure their static shear strength. One girder was tested after the fatigue test to measure its flexural strength. The five girders had a design concrete compressive strength of 10,000 psi (69.0 MPa) and incorporated 0.6-in. (15.2- mm) diameter, Grade 270, low relaxation prestressing strands. The shear reinforcement quantities at the ends of three girders were selected to evaluate the applicability of the shear strength design provisions of the AASHTO Standard Specifications for Highway Bridges and the AASHTO LRFD Bridge Design Specifications. Shear reinforcement consisted of conventional bars or deformed welded wire reinforcement. The five prestressed concrete girders were produced in a commercial plant. Prior to testing, a 10-ft. (3.05- m) wide reinforced concrete deck slab was added to each girder. Three girders were intentionally cracked at midspan before the start of the fatigue test. Two girders were uncracked. After completion of fatigue testing, the three intentionally cracked girders were cut in half and the six girder ends tested to evaluate static shear strength. The cracked bulb-tee girders performed satisfactorily under 5 million cycles of flexural fatigue loading when the tensile stress in the extreme fiber of the bottom flange was limited to a maximum value of 610 psi (4.21 MPa).
报告类型：	科技报告