Simulation of An RC Bridge Column Shake-Table Test Using a Fiber Beam-Column Model Considering Reinforcement Anchorage Slip


Abstract eng:
Reinforcement slip in footing can make a significant contribution to the total lateral displacement of a reinforced concrete (RC) column, and thereby greatly influenced the seismic responses. In this paper, to simulate a flexure-dominated RC bridge column shake-table test, a modified fiber beam-column element model considering reinforcement slip in footing is developed and implemented in a general commercial finite element (FE) package. First, on the basis of an effective macro model for calculating anchorage slip and a classical uniaxial stress–strain relationship of rebar, the reinforcement anchorage slip in the footing is formulated. The macro model assumed a stepped bond stress to deal with the bond–slip relationship, and the slip is derived by integrating the strain over the development length. Then, the derived anchorage slip is introduced into the framework of the conventional fiber element model. By considering the rebar fiber strain in the footing fiber element as the sum of the rebar deformation and the anchorage slip, the stress–strain skeleton curve and the hysteretic law of rebar are modified. Finally, the shake-table test of a full-scale flexure-dominated bridge column is simulated to validate the developed model. Comparisons indicate the considerably improved accuracy of the developed model in simulating the column displacement time-histories, base moment–column displacement responses, and base moment–base curvature responses. The developed model shows good accuracy in simulating the moment capacity and column stiffness, whereas the conventional fiber model significantly overestimates the column lateral stiffness. In addition, the measured lateral displacement ratio caused by the fixed-end rotation in each test is well predicted by the developed model. Therefore, the model is validated at structural, sectional and micro levels.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3427.:
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