The micro–mechanical mechanism of multiple cracking behavior induced by interface strengthening for UHPC

•The matching design of matrix tensile strength and fiber–matrix interface bonding strength is proposed, and multiple cracking of fiber reinforced cement–based composites is achieved.•The influence of interface bond strength on pulley force, additional stress, stress transfer distance and bridge stress were investigated.•The matrix stress field development of samples was simulated, and the critical factors influencing multiple cracking were identified.