Effects of the clearance between the core plate and restraining part on the structural performance of the buckling‐restrained brace using steel mortar planks

Abstract

The clearance between the core plate and the restraining part of the buckling-restrained brace using steel mortar planks (BRBSM) considerably affects the failure mode and hysteretic characteristics of the brace. A clearance adjustment construction is proposed for the BRBSM which can control the clearance through partially pasting clearance adjustment materials and polishing the mortar plank surface. First, the clearance adjustment construction workflow and quality control are demonstrated, and it is verified that the clearance can be assured by fabricating specimens. Further, the effects of the difference in clearance between the core plate and restraining part on the structural performance of the BRBSM in terms of failure behaviour, increase strength ratio, buckling mode and cumu lative plastic strain energy ratio are evaluated by conducting a cyclic axial loading test.

Proposal and application of structural soundness monitoring system for the buckling‐restrained brace using steel mortar planks

“…Additionally, though the cumulative plastic strain energy is approximately similar to distribution of the cumulative plastic displacement, the cumulative plastic strain energy includes the strain hardening of the core plate, and the tendency in the fluctuation of the axial force in the plastic zone can be considered. It is therefore considered easier to accurately evaluate the extent of damage using the cumulative plastic strain energy than the cumulative plastic displacement [25][26][27].…”

“…Figure 6a shows the comparisons between hysteresis characteristics calculated by the displacement sensor and ones by laser displacement devices. The loading method is reversed by the incremental cyclic loading under the axial displacement control, and the loading is performed until an axial strain amplitude of 3 % is observed in the core plate [27]. Here, the loading-displacement curves for monitoring are produced by the displacement sensor.…”