Abstract
Recently, ultra high performance fiber reinforced concrete (UHPFRC) has been developed to attain considerably increased compressive cracking strength and ductile tensile behavior with high tensile strength through adding straight steel fibers in concrete mixture. Although benefits with UHPFRC were investigated through experimental program, it is difficult to predict structural behavior of UHPFRC members since theoretical approaches are limited. In this paper, inverse analysis procedure has been proposed for a three-point bending test with notched UHPFRC beams so that tensile behavior of UHPFRC could be rationally evaluated. On the inverse analysis procedure, failure mode of the UHPFRC beam was simplified and the simplified diverse embedment model (SDEM) was employed. To verify the proposed inverse analysis procedure, UHPFRC beams with a notch were analyzed with the tensile behavior of UHPFRC evaluated through the inverse analysis procedure. The analytical predictions showed good agreement with the load-crack mouth opening displacement (CMOD) responses measured through the three-point bending test. Consequently, it can be concluded that UHPFRC tensile behavior can be rationally evaluated through the proposed inverse analysis procedure. The proposed inverse analysis procedure can be useful in relevant research areas such as development of advanced design approaches or computational methods for UHPFRC members.
Highlights
To overcome brittle behavior of concrete after cracking, a number of researches have been conducted to use fiber reinforced concrete as a structural member [1,2,3,4,5,6]
To verify the proposed inverse analysis procedure, test results are compared with analytical predictions based on the tensile behavior of ultra high performance fiber reinforced concrete (UHPFRC) evaluated through the proposed inverse analysis procedure
In order to evaluate the tensile behavior of UHPFRC, the pullout strength of a straight steel fiber has been evaluated through the proposed inverse analysis with the Simplified diverse embedment model (DEM) (SDEM)
Summary
To overcome brittle behavior of concrete after cracking, a number of researches have been conducted to use fiber reinforced concrete as a structural member [1,2,3,4,5,6]. Conventional fiber reinforced concrete usually exhibits softening behavior with a single dominant crack since tensile stress due to fibers is less than cracking strength of concrete matrix. High performance fiber reinforced concrete exhibits stiffening behavior with multiple cracks since tensile stress due to fibers is larger than cracking strength of concrete matrix. To predict structural behavior of fiber reinforced concrete members, a simple model is required to represent the tensile behavior of fiber reinforced concrete. Based on the DEM and SDEM, structural behavior of fiber reinforced concrete members with rebars could be more rationally predicted through considering stress distribution in a member and through development of analysis procedure [15, 16]. UHPFRC can exhibit very high compressive strength more than 150 MPa and ductile tensile behavior with well-distributed multiple cracks. To verify the proposed inverse analysis procedure, test results are compared with analytical predictions based on the tensile behavior of UHPFRC evaluated through the proposed inverse analysis procedure
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