摘要
为了解决配筋率、偏心距和混杂配筋面积比对混凝土柱的破坏形式、影响侧向位移和柱正截面承载力计算的问题,采用构件试验的方法,对6根钢筋与玻璃纤维增强聚合物筋混杂配筋柱进行偏压试验。试验结果表明:混杂配筋柱最终破坏形式均为混凝土压碎且承载力较高,破坏前柱内玻璃纤维增强聚合物筋保持完好;通过合理配筋,柱延性及受拉玻璃纤维增强聚合物纵筋强度能够较好发挥;试验中玻璃纤维增强聚合物纵筋与混凝土截面应变分布符合平截面假定;同荷载时,柱侧向位移随配筋率增大而减小,随混杂配筋面积比(玻璃纤维增强聚合物与钢筋面积之比)和偏心距增大而增大。依据平截面假定,建立了混杂配筋柱正截面承载力公式,计算准度较高,供设计参考。
To resolve the impact of reinforcement ratio,eccentricity,and hybrid reinforcement area ratio on the failure mode and lateral displacement,and to calculate the cross-sectional bearing capacity of concrete columns,the component test method is adopted to conduct eccentric compression on six columns with hybrid reinforcement of glass fiber-reinforced polymer (GFRP) bars and steel bars.The test results showed that all specimens failed due to concrete crushing,and with high capacity,the longitudinal and transverse GFRP remained intact before failure.With appropriate reinforcement,the hybrid reinforced column achieved better ductility and GFRP longitudinal bars gained larger strength.During the test,the strain distribution of the cross section of GFRP longitudinal bars and concrete met the plane section assumption.Under the same load,the lateral displacement of hybrid reinforced columns decreased with increase in the reinforcement ratio,and increased with the increase in eccentricity and hybrid reinforcement area ratio,i.e.,GFRP-to-steel bar area ratio.Based on the plane section assumption,a formula for hybrid reinforced columns cross-sectional bearing capacity calculation is established,which has a high accuracy and can be a reference for design.
作者
邓宗才
高伟男
DENG Zongcai;GAO Weinan(Beijing Key Lab of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2019年第9期1622-1628,共7页
Journal of Harbin Engineering University
基金
国家自然科学基金项目(51578021)
关键词
玻璃纤维增强聚合物筋
钢筋
混杂配筋
偏心受压
正截面
承载力
glass-fiber reinforced polymer (GFRP) bar
steel bar
hybrid reinforcement
eccentric compression
cross section
bearing capacity
