Fibre optic strain measurements for bond modelling of prestressed near-surface-mounted iron-based shape memory alloy bars

نویسندگان

چکیده

Near-surface-mounted (NSM) iron-based shape memory alloy (memory-steel) bars represent a novel type of reinforcement for prestressed strengthening concrete structures. To examine the bond behaviour these embedded reinforcements in detail, fibre optic (FO) methods can be used. In this study, distributed FO strain measurements were performed small-scale experiments and large-scale structural using non-prestressed NSM memory-steel bars. The demonstrated measurement technique's feasibility on bars, provided insights into complex profiles before after prestressing, revealed active lengths. When bar was subjected to an external load, reduction bar's stiffness resulted increase length. results furthermore highlighted importance rigid fixations avoid prestress loss. obtained distributions also processed calculate slip axial stress, investigate parameters three different shear stress–slip laws (BSSLs). A linear increasing BSSL with nonlinear led realistic calculation stress bar, while resulting acceptable strain. implementation constant Young’s modulus consistently overestimated stress.

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ژورنال

عنوان ژورنال: Construction and Building Materials

سال: 2021

ISSN: ['1879-0526', '0950-0618']

DOI: https://doi.org/10.1016/j.conbuildmat.2021.123102