High Strength Self Consolidating Concrete Girders subjected to Elevated Compressive Fiber Stresses





INTRODUCTION

The possibility of increasing the allowable compressive stresses at release of prestressing has ecently garnered significant interest. Stress limits are imposed to ensure adequate serviceability

erformance and to prevent premature failure of materials. As engineers continue to push the nvelope on span length and girder spacing to reduce costs, bridge girders are subjected to

ncreasingly higher levels of stress under service loading. Increasing the allowable limits at elease of prestressing would increase the amount of steel a given section can contain and reduce

r eliminate the need for draping or debonding of strands resulting in improved plant safety. urther, this would allow faster turnaround for precast plants since prestressing could be released

t lower concrete strengths. In addition, an increasing number of precast plants would like to eap the benefits of self-consolidating concrete (SCC), but they are reluctant to use this material

ecause its behavior and its use has been rather limited in prestressing applications. Therefore, his investigation studied the prestress loss behavior and structural performance of prestressed

oncrete girders produced with high-strength self-consolidating concrete (HS-SCC) subjected to levated compressive fiber stresses at release of prestressing.



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