Hysteretic behavior of UHPC beam-column joints after fire exposure

被引：13

作者：

Cai, Xuesong ^{[1
]}

Taerwe, Luc R. ^{[2
,3
]}

Yuan, Yong ^{[1
,2
]}

机构：

[1] Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China

[2] Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China

[3] Univ Ghent, Dept Struct Engn, Ghent, Belgium

来源：

FIRE SAFETY JOURNAL | 2020年 / 117卷

关键词：

Fire; Beam-column joint; UHPC; Mechanical performance; Quasi-static test; HIGH-PERFORMANCE CONCRETE; HIGH-STRENGTH CONCRETE; SEISMIC PERFORMANCE; RESISTANCE; EBROG; FIBER; DESIGN;

D O I：

10.1016/j.firesaf.2020.102987

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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.

引用

页数：11

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