TY - JOUR
T1 - Experimental study on cyclically-damaged steel-concrete composite joints subjected to fire
AU - Ye, Zhongnan
AU - Jiang, Shouchao
AU - Heidarpour, Amin
AU - Li, Yingchao
AU - Li, Guoqiang
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Earthquake and fire are both severe disasters for building structures. Since earthquake-induced damage will weaken the structure and reduce its fire endurance, it is important to investigate the behavior of structure subjected to post-earthquake fire. In this paper, steel-concrete composite beam-to-column joints were tested under fire with pre-damage caused by cyclic loads. Beforehand, three control specimens with no pre-damage were tested to capture the static, cyclic and fire-resistant performance of intact joints. Experimental data including strain, deflection and temperature recorded at several points are presented and analyzed to quantify the influence of cyclic damage on fire resistance. It is indicated that the fire endurance of damaged joints decreased with the increase of damage level, mainly due to faster heating-up rate after cyclic damage. However, cracks induced by cyclic loading in concrete are found to mitigate the concrete spalling at elevated temperatures. Moreover, the relationship between fire resistance and damage degree is revealed from experimental results, which can be applied in fire safety design and is worthwhile for further research.
AB - Earthquake and fire are both severe disasters for building structures. Since earthquake-induced damage will weaken the structure and reduce its fire endurance, it is important to investigate the behavior of structure subjected to post-earthquake fire. In this paper, steel-concrete composite beam-to-column joints were tested under fire with pre-damage caused by cyclic loads. Beforehand, three control specimens with no pre-damage were tested to capture the static, cyclic and fire-resistant performance of intact joints. Experimental data including strain, deflection and temperature recorded at several points are presented and analyzed to quantify the influence of cyclic damage on fire resistance. It is indicated that the fire endurance of damaged joints decreased with the increase of damage level, mainly due to faster heating-up rate after cyclic damage. However, cracks induced by cyclic loading in concrete are found to mitigate the concrete spalling at elevated temperatures. Moreover, the relationship between fire resistance and damage degree is revealed from experimental results, which can be applied in fire safety design and is worthwhile for further research.
KW - Composite joint
KW - Cyclic loading
KW - Fire endurance
KW - Fire-resistant performance
KW - Post-earthquake fire
UR - http://www.scopus.com/inward/record.url?scp=85062551595&partnerID=8YFLogxK
U2 - 10.12989/scs.2019.30.4.351
DO - 10.12989/scs.2019.30.4.351
M3 - Article
AN - SCOPUS:85062551595
SN - 1229-9367
VL - 30
SP - 351
EP - 364
JO - Steel and Composite Structures
JF - Steel and Composite Structures
IS - 4
ER -