玻璃纤维布约束混凝土方柱应变演化规律研究

Strain Evolution of Concrete Square Columns Confined by GFRP

为从应变演化发展角度解析约束混凝土方柱的破坏机理,对玻璃纤维布约束混凝土方柱的应变演化规律进行了试验研究与有限元模拟,考虑玻璃纤维布的不同包裹方式对方柱任意截面应变演化的影响.研究结果表明,在轴压荷载作用下,柱身内部纵向截面上混凝土的应变演化由纵向四等分点位置向中部发展;柱身中部横截面上,应变演化由内到外、由侧面到棱角发展;玻璃纤维布条带包裹的混凝土方柱临近破坏时,中间位置纤维布条带应力达到其上下相邻两纤维布条带应力的两倍以上.研究结果可供FRP及钢板箍约束混凝土方柱受力分析时参考.

To obtain the failure mechanism of concrete square columns from the strain evolution perspective,the strain evolution of concrete square columns confined with GFRP jackets were studied with the experimental investigation and finite element simulation, and the different wrapped methods of Glass Fiber Reinforced Polymer（GFRP） sheets were considered. The results showed that the strain evolution of concrete square columns in longitudinal section was from longitudinal four equal point locations to the central under axial compression;in the central cross section of the square columns, the strain evolution was from inside to outside, from side to edges and comers;near destruction, the stress in the middle of GFRP strip was two times or more of that of the adjacent GFRP strips. These results could be used to evaluate the working performance of concrete square columns confined by FRP or steel strips.