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Hysteretic behavior of UHPC beam-column joints after fire exposure

Journal Contribution - Journal Article

Joints are critical parts of structural members. In order to study the mechanical properties of beam-column joints improved by using UHPC after fire exposure, a series of tests have been conducted on reinforced concrete beam-column joints, with both conventional concrete and UHPC in the joint. Fire exposure tests were carried out on the specimens in the light of the designated heating curve, then followed by quasi-static loading tests. Measurements were respectively made on the temperature and load-displacement of the joints. Several significant parameters were analysed from the results of the loading tests, such as pinching width ratio, displacement ductility factor, energy dissipation, stiffness degradation and equivalent hysteretic damping ratio. The results show that high temperatures have a significant effect on the ultimate strength and initial stiffness of concrete beam-column joint specimens. The application of UHPC significantly improves the mechanical behaviour of beam-column joints. In addition, the energy-consuming capacity is enhanced. After fire exposure, the loading capacity of UHPC specimens is reduced correspondingly.
Journal: FIRE SAFETY JOURNAL
ISSN: 1873-7226
Volume: 117
Publication year:2020
Accessibility:Closed