摘要
通过GFRP筋混凝土梁和普通钢筋混凝土梁的破坏试验,对GFRP筋混凝土梁跨中荷载挠度等受力变形规律进行了试验研究。讨论了GFRP筋混凝土梁有限元建模计算的方法,参照普通钢筋混凝土梁的有限元模型,采用线弹性本构关系模型,对不同配筋率的GFRP筋混凝土抗弯性能进行了计算研究。结果表明,GFRP筋混凝土梁的跨中荷载挠度曲线在混凝土开裂后呈平台状,在配筋率较小的情况下,平台段相对较长;随着配筋率的提高,平台段逐渐缩短;当配筋率增加到一定程度时,平台段完全消失。有限元模型计算得出的荷载-跨中位移曲线和试验梁的相应曲线吻合较好。
Regularities that include load-deflection at mid-span and other related deformation of glass fiber reinforced plastics（GFRP） reinforced concrete beams were summarized through destructive experiments of GFRP reinforced concrete beams and ordinary reinforced concrete beams.According to the finite element model of ordinary reinforced beams,the methods of finite element model to calculate GFRP reinforced concrete beams were discussed where GFRP bar was considered as linear elastic material,then the flexural performance of GFRP reinforced concrete beams with different reinforcement ratios were calculated.The results show that load-deflection curve of GFRP reinforced concrete beam at mid-span displays a platform shape after concrete cracking： the platform in load-deflection curve is relatively longer when GFRP reinforcement ratio is lower,the length of platform becomes shorter as the GFRP reinforcement ratio increases,when reinforcement ratio reaches a certain value,the platform disappears.The mid-span load-deflection curves of the GFRP reinforced concrete beams got from finite element method are coincide well with the related experimental results.
出处
《公路交通科技》
CAS
CSCD
北大核心
2011年第2期88-92,共5页
Journal of Highway and Transportation Research and Development
基金
重庆市教育科技基金资助项目(040403)
