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Research on the seismic behavior of HPC shear walls after fire

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Abstract

Four shear wall specimens made of high-performance concrete with blast-furnace-slag (BFS-HPC) are tested and studied under low frequency cyclic loading. Prior to the cyclic test, three specimens are subjected to elevated temperatures (400°C, 600°C) and two of them are mixed with polypropylene fiber. Based on experimental results, different curves are drawn and analyzed to study the seismic behavior of BFS-HPC shear walls after fire. They include load vs. lateral displacement hysteretic curves, load vs. lateral displacement skeleton curves, energy dissipation capacity curves, and stiffness degradation curves etc. Besides, the effect of polypropylene fiber on the seismic behavior of BFS-HPC shear wall after fire is also examined. This investigation demonstrates that elevated temperature exposure dramatically decreases the seismic performance of BFS-HPC shear walls, whereas polypropylene fiber can remarkably improve the seismic behavior of BFS-HPC shear walls after fire.

Résumé

Quatre essais sont étudiés pour des voiles en béton à hautes performances (BHP) à base de laitier de hautfourneau sous un chargement cyclique de basse fréquence. Trois échantillons sont soumis à une élévation de température (400°C, 600°C) et deux d'entre eux sont mélangés à de la fibre de polypropylène. Basé sur des résultats expérimentaux des courbes sont dessinées et analysées pour déterminer le comportement sismique des voiles en BHP après un feu et l'effet de la fibre de polypropylène sur le comportement sismique de voiles en BHP. Les courbes comprennent: les courbes d'hystérésie (chargement-déplacement latéral), les courbes squelettes chargement-déplacement latéral, les courbes de capacité de dissipation d'énergie, les courbes d'affaiblissement de rigidité du voile. L'étude a conclu que la haute température diminue gravement la capacité de comportement sismique de voile BHP, tandis que la fibre de polypropylène peut énormément améliorer le comportement sismique de voiles en BHP après un feu.

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Authors and Affiliations

  1. Department of Building Engineering, Tongji University, 200092, Shanghai, P.R. China

    J. -Zh. Xiao, J. Li & F. Jiang

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  1. J. -Zh. Xiao
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  2. J. Li
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  3. F. Jiang
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Xiao, J.Z., Li, J. & Jiang, F. Research on the seismic behavior of HPC shear walls after fire. Mat. Struct. 37, 506–512 (2004). https://doi.org/10.1007/BF02481574

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  • DOI: https://doi.org/10.1007/BF02481574

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