玻璃纤维增强塑料约束再生混凝土轴压试验

On Recycled Concrete Confined by GFRP Tube Under Axial Compression

摘要:

主要以再生粗集料取代率为试验研究参数，完成了9个玻璃纤维增强塑料(GFRP)约束再生混凝土圆柱试件的轴压试验，重点分析了试件的受压破坏特性、轴向力—纵向位移关系、横向应变发展以及约束再生混凝土的横向变形系数的变化规律.试验和分析结果表明：GFRP约束再生混凝土纵向应力—应变关系呈弹性上升、弹塑性上升、下降、应变强化等4个阶段，其强度得到明显提高，变形性能得到改善，核心再生混凝土和GFRP管之间滑移较小，含再生粗集料试件的横向变形系数普遍低于不含再生粗集料的试件.

Abstract:

Based on tests of 9 recycled concrete specimens confined by glass fiber reinforced plastics (GFRP) tube with different recycled coarse aggregate replacement percentages under axial compression,an investigation was made into the failure properties under compression,axial forcelongitudinal displacement relationship,lateral strain development and variation rule of lateral deformation ratio of the test specimens.It is found that the stressstrain relationship of GFRP confined recycled concrete can be divided into four branches, i.e., the elastic ascending branch,the elastoplastic ascending branch,the descending branch and strainstrengthening branch.The strength and deformation ability of confined recycled concrete are obviously improved than those of unconfined recycled concrete.The slip between the inner recycled concrete and the GFRP tube is negligible,and the lateral deformation ratio of specimens containing recycled aggregates is lower than those without recycled aggregates.