Fatigue properties of special kind of reinforced concrete composite beams |
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Authors: | Tie-ming Hu Cheng-kui Huang and Xiao-feng Chen |
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Affiliation: | [1]State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China [2]School of Architectural and Civil Engineering, Shenyang University, Shenyang 110044, China |
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Abstract: | The special reinforced concrete composite beam consists of a steel fiber reinforced self-stressing concrete composite layer
and a reinforced concrete T-beam, and constructional bars are set up at their bonding interface. Fatigue properties of the
composite beam under the action of negative moment were experimentally studied. Through inverted loading mode the load-bearing
state of a composite beam was simulated under the action of negative moment. With the ratios of constructional bars being
0, 0.082% and 0.164% respectively as parameters, the effects of constructional bars on the properties of composite beam, such
as fatigue life, crack propagation, rigidity loss as well as damage behavior of bonding interface, were studied. The mechanism
of the constructional bars on the fatigue properties of the composite beams and the restriction mechanism of crack widths
and rigidity loss were analyzed. The test results show that the constructional bars can enhance the shear resistance of the
bonding interface between composite layer and old concrete beam and restrict expanding of steel fiber reinforced self-stressing
concrete, which are beneficial to synergistic action of composite layer and old concrete beam, to reducing the stress amplitude
of bars and the crack width of composite layer, and to increasing the durability and fatigue life of the composite beam. |
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Keywords: | steel fiber reinforced self-stressing concrete composite beam constructional bar bonding interface fatigue |
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