Medium shear span ratio reinforced columns are prone to complex failure under seismic action. This paper compares the seismic performance of normal concrete columns and UHPC columns by introducing ultra-high-performance concrete (UHPC). The shear span ratio (2.4-4.4) and axial compression ratio (0.10, 0.36) were used as variables, and the bearing capacity, ductility and failure mode were analyzed through low-cycle reciprocating loading studys. The results showed that UHPC significantly improved the bearing capacity, stiffness and energy dissipation capacity of the column, and suppressed the crushing and spalling of concrete. When the shear span ratio is 2.4 and the axial compression ratio is 0.36, the failure mode of UHPC columns was changed from shear failure to flexural shear failure. Thus this study can become a reference for the seismic design of UHPC columns.
Duan et al. (Thu,) studied this question.
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