Residual Shear Capacity of RC Beams without Stirrups after Fire Exposure

被引:1
|
作者
Song, Yamin [1 ,2 ]
Fu, Chuanguo [3 ]
Liang, Shuting [2 ]
机构
[1] Shandong Jiaotong Univ, Sch Civil Engn, Don Coll, Jinan 250357, Peoples R China
[2] Southeast Univ, Sch Civil Engn, Nanjing 210096, Peoples R China
[3] Shandong Jianzhu Univ, Sch Civil Engn, Jinan 250101, Peoples R China
基金
中国国家自然科学基金;
关键词
fire exposure; shear capacity; shear span ratio; load ratio; longitudinal reinforcement ratio; REINFORCED-CONCRETE COLUMNS; BEHAVIOR;
D O I
10.3390/buildings12101706
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
To investigate the shear capacity and failure mechanism of RC beams after fire exposure, fourteen full-scale beams without stirrups were tested at ambient temperature and after fire exposure. Three parameters, including the loading ratio, shear span-to-depth ratio and longitudinal reinforcement ratio, were considered in static load tests. The deterioration mechanism of the shear bearing capacity at the diagonal section of RC beams without stirrups after fire exposure was experimentally, numerically and theoretically revealed, and a calculation formula for the shear capacity of post-fire beams without stirrups was proposed. The results show that the shear capacity and stiffness of the specimens decreased after fire exposure, and the shear strength loss of the beams increased with fire exposure time. The shear capacity and stiffness of fire-damaged specimens decreased as the shear span ratio lambda increased, and the shear strength loss of the beams decreased with lambda. Compared with the theoretical calculation and experimental results of beams without stirrups, the average of the absolute errors was 10.48%. Therefore, this formula can better calculate the residual shear capacity of beam without stirrups after fire exposure.
引用
收藏
页数:21
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