工艺与制造英文2025被引 3
连续碳纤维增强热塑性聚合物3D打印筋用于混凝土柱加固
3D printing of continuous carbon fiber-reinforced polymer reinforcement for concrete columns
Jun‐Jie Zeng, Yuanyuan Jiang, Zi-Tong Yan, Hou-Qi Sun, Junhao Huang, Yan Zhuge · University of South Australia
摘要整理
纤维增强复合材料（FRP）钢筋和螺旋筋作为混凝土结构内部加固已成为FRP建筑复合材料领域的主流方向。传统的基于拉挤工艺的FRP筋制造过程不仅导致大量材料浪费，而且在弯曲段易产生纤维褶皱，严重降低弯曲钢筋的力学性能。为解决这些问题，本研究采用新型3D打印连续碳纤维增强热塑性聚合物（CFRTP）筋加固混凝土柱。首先对3D打印CFRTP圆形箍筋进行环向拉伸试验。随后将3D打印CFRTP箍筋（3DP-CFRTPTs）作为横向加固应用于混凝土圆柱和方柱，评估其有效性。对6个圆柱和6个方柱进行轴向压缩试验，研究箍筋截面高度和间距对3DP-CFRTPTs加固混凝土柱压缩性能的影响。结果表明，3DP-CFRTPTs显著提高了试件的压缩强度，箍筋间距对压缩强度有显著影响。将试验结果与8种不同模型的预测值进行对比，发现现有FRP条带约束混凝土模型适用于预测3DP-CFRTPT约束混凝土的极限轴向应力，但无法准确预测轴向应变。研究表明3D打印CFRTP箍筋显著增强了混凝土压缩强度，较小的箍筋间距导致约束效果更强、轴向性能更优；3DP-CFRTP约束混凝土呈现明显的三阶段应力-应变特性；现有FRP条带模型对轴向应力预测效果良好，但应变预测需进一步完善。
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