张霓 郑晨阳 羡丽娜 王连广

摘 要：为研究玻璃纤维管钢筋混凝土空心柱轴压下的徐变性能，对空心柱轴压下的受力特性进行分析，建立了适用于玻璃纤维管钢筋混凝土空心柱轴压徐变公式。编制轴心受压荷载作用下徐变分析程序计算徐变应变与时间关系曲线，并通过已有试验对该程序的正确性进行验证。在程序正确性的基础上，计算空心率、混凝土强度、作用荷载及玻璃纤维管壁厚等主要参数对其轴压徐变性能的影响。结果表明：空心柱的徐变应变在28 d以内（作用初期）增长较快，28 d以后增长速度变得缓慢，大约6个月以后徐变应变趋于稳定。空心率和混凝土强度对玻璃纤维管钢筋混凝土空心柱轴压徐变影响较小，其次是玻璃纤维管壁厚，作用荷载对徐变影响较大。

关键词：玻璃纤维管;钢筋混凝土;空心柱;轴压;徐变性能

中图分类号：TU378.3 文献标志码：A 文章编号：2096-6717（2021）06-0088-07

Abstract： In order to study the characteristics of creep performance of glass fiber reinforced concrete hollow columns under axial compression， the mechanical properties were analyzed according to the mechanical characteristics of the hollow column under axial compression in this paper.The creep formula of the GFRP tube reinforced concrete hollow column was established under axial compression.A creep analysis program under the axial compression load was developed to calculate the creep strain-time relationship curve. And the correctness of creep program was verified by existing tests. On this basis， the influence of the main design parameters， such as applied load， thickness of GFRP tube wall， strength grade of concrete and hollow ratio on axial compression creep performance was calculated and analyzed.The results show that the creep of hollow columns increases rapidly in 28 days （the early stage of load action）， and the growth rate becomes slower after 28 days.The creep tends to be stable after about 6 months. The hollow ratio and concrete strength have little effect on the axial compressive creep of GFRP concrete hollow columns，followed by the thickness of GFRP tube wall. The applied load has a greater effect on the creep.

Keywords：glass fiber reinforced polymer tube; reinforced concrete; hollow columns; axial compression; creep behavior

玻璃纖维管钢筋混凝土柱是将纵向受力钢筋放置于玻璃纤维管内，并在管内灌注混凝土形成的实心柱。玻璃纤维管优良的抗腐蚀性能可以保护内部纵向钢筋和混凝土，同时，混凝土强度因玻璃纤维管的约束作用得到提高。该结构的优异性能受到工程界的广泛关注，由于该结构更能适应当今工程结构承受恶劣环境的需要以及向重载、轻质、大跨及高强发展的要求，因而在地下工程、民用建筑、桥梁和海洋工程中得到越来越广泛地应用[1-3]。随着研究和应用的不断发展，从玻璃纤维管钢筋混凝土实心截面逐渐发展到空心截面[4-6]。……