中文摘要：

进行16个圆截面CFRP-钢管混凝土构件受弯的试验研究。结果表明，对于包裹纵向CFRP的构件，其弯矩－曲率曲线总体上可以划分为以下三个阶段，即弹性段、弹塑性段和软化段；构件的极限弯矩提高率随着纵向CFRP层数的增大或钢管外径的减小而增大；纵向CFRP可显著提高构件的抗弯刚度。试验结果还表明，从加载开始到极限弯矩，钢管和CFRP在环向和纵向都可以协同工作；纵向受拉的钢管对核心混凝土没有环向套箍作用。在大约0．7倍的极限弯矩之前，纵向应变沿截面高度的分布基本符合平截面假定；构件的挠曲线基本为正弦半波曲线。应用纤维模型法分析圆CFRP－钢管混凝土受弯构件的弯矩一曲率曲线，计算结果与试验结果吻合良好，且总体上偏于安全。

英文摘要：

Sixteen concrete filled circular CFRP-steel tubular flexural members were experimentally investigated. The test results showed that the moment-curvature curves of the composite members with longitudinal CFRP could be divided into three stages, i.e., elastic, elasto-plastic and softening stages, and the ultimate moment enhancement ratio increases with the increase of the number of longitudinal CFRP layers and the decrease of the diameter of outer steel tubes. The longitudinal CFRP can enhance the flexural stiffness of the composite members significantly. The tests results also showed that the steel tube and its outer CFRP material can work together both longitudinally and circumferentially prior to the ultimate moment stage, that the steel tube （under longitudinal tension） has no circumferential confinement effect on the core concrete, and that the distribution of longitudinal strains over depth of the cross-section remains approximately linear during the loading process before about 70% of the ultimate moment is reached. The deflection curve of the tested members could be regarded as half sin wave. A fiber element approach suitable for the analysis on the moment-curvature curves for the composite members was proposed, and the predicted results agree well with those of the tests and are on the safe side.