Aim to investigate the degradation laws of joint performance and flexural bearing capacity of prefabricated reinforced-concrete beams with two assembly methods after fire exposure, providing a theoretical basis for fire-resistant design.
Six full-scale prefabricated reinforced-concrete beams were designed (4 subjected to fire exposure and 2 as ambient-temperature controls), followed by fire exposure tests adhering to the ISO 834 standard heating curve and post-fire static bending tests. A thermo-mechanical coupled finite-element model was developed using ABAQUS to simulate their post-fire flexural bearing performance.
Significant temperature gradients in beam sections post-fire, with normal joint performance; all beams exhibited flexural failure (tensile steel yielding and compressive concrete crushing). Ultimate load and stiffness decreased with fire duration, with numerical results consistent with experiments.
First comparative study on fire resistance of two assembly methods, validating joint reliability; establish an effective model to offer data and methodology support for fire-resistant design and post-fire assessment of prefabricated structures.
