Bond-slip response of steel fibers after exposure to elevated temperatures: experimental program and design-oriented constitutive equation - Serafini, Ramoel; Agra, Ronney Rodrigues; Bitencourt Júnior, Luís Antônio Guimarães; Fuente Antequera, Albert de La; Figueiredo, Antonio Domingues de (Composite Structures, 2021)