Experimental Investigation of Friction at Buckling-Restrained Brace Debonding Interfaces

The friction behavior of mortar–polymer–steel debonding interfaces was experimentally investigated to support numerical simulation buckling-restrained braces (BRBs). Characteristic contact and slip demands were developed using two-dimensional Abaqus models inform a full-scale test program. A stabilized dynamic coefficient 0.065 observed for reciprocating two-way sliding at the reference bearing pressure (20 MPa), amplitude (±20 mm), velocity (30 mm/s) but increased 0.16 low pressures reduced 0.03 quasi-static loading. recurring 40% amplification in each one-way cycle, where only applied one direction motion, replicating actual condition BRB wavecrests. system wear effect also small patches mortar exposed then resurfaced, increasing smeared by up 0.15. Finally, compressible gap closely matched polymer thickness, excluding textile backing, if present. nonlinear model dependent on pressure–velocity–distance developed, recommendations made improve common testing provisions.