Axial compressive behavior of seawater coral aggregate concrete-filled FRP tubes
Axial compressive behavior of seawater coral aggregate concrete-filled FRP tubes
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海水珊瑚骨料混凝土填充FRP管轴压性能
DOI：
10.1016/j.conbuildmat.2017.04.169
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发表时间：
2017-08-30
影响因子：
7.4
通讯作者：
Yue, Qingrui
中科院分区：
文献类型：
--
作者：
Wang, Jie;Feng, Peng;Yue, Qingrui
在玻璃钢管混凝土（CFFT）构件中使用海水珊瑚骨料混凝土（SCAC）代替普通骨料混凝土（OAC）非常有吸引力，因为纤维增强聚合物（FRP）具有良好的耐盐性，可以有效抵消SCAC中含氯离子的最大缺点。在海洋建筑的发展中，SCAC 填充 FRP 管是腐蚀性海洋环境中桩和柱应用的潜在有吸引力的替代品。本研究首先对 SCAC 填充 FRP 管 (SCFFT) 的轴向压缩行为进行了实验研究，并与 OAC 填充 FRP 管 (OCFFT) 进行了比较。对所选择的珊瑚骨料（CA）和SCAC进行了系统的制备和测试，包括CA的分类和材料测试、SCAC的单轴载荷测试以及SCAC的微观结构分析。 CA的多孔性质和低强度导致SCAC在单轴载荷下具有不同的脆性破坏机制，并导致SCAC在快速膨胀和激活SCFFT中的约束之前经历压实行为。因此，对于大约 0.002 到 0.004 之间的轴向应变范围，SCFFT 的轴向载荷在过渡区显示出轻微下降。 SCAC 的不均匀性和脆性导致 SCFFT 在压缩下环向应变分布不均匀，从而削弱了约束的效果。 SCFFT 的极限载荷约为 OCFFT 对应物的 60%。阐述了用于开发用于预测轴向压缩下 FRP 约束 SCAC 的详细分析导向模型的关键要素和基本框架。此外，最初为FRP约束陶粒骨料轻质混凝土开发的模型被扩展到涵盖FRP约束SCAC，并且扩展模型被证实能够产生可靠的预测。 (C) 2017 Elsevier Ltd. 保留所有权利。
The use of seawater coral aggregate concrete (SCAC) instead of ordinary aggregate concrete (OAC) in concrete-filled FRP tube (CFFT) members is highly attractive due to the beneficial effect of fiber reinforced polymer (FRP), which has good resistance to salt and can effectively counteract the greatest shortcomings of the chloride-containing ions in SCAC. In the development of marine construction, SCAC-filled FRP tubes are a potential attractive alternative for pile and column applications in corrosive marine environments. The axial compressive behavior of SCAC-filled FRP tube (SCFFT) was first experimentally investigated and compared with OAC-filled FRP tube (OCFFT) in this study. The chosen coral aggregates (CAs) and SCAC were systematically prepared and tested, including classification and materials testing on CAs, uniaxial load testing on SCAC and microstructure analysis of SCAC. The porous nature and low strength of CAs led to a different and brittle failure mechanism of SCAC under uniaxial loading, and result in SCAC experiencing a compacting behavior before the development of its rapid expansion and the activation of confinement in SCFFT. As a consequence, the axial loading of SCFFT displayed a slight drop in the transition zone for the range of axial strains between approximately 0.002 and 0.004. The non-homogeneity and brittleness of SCAC led to a non-uniform hoop strain distribution in SCFFT under compression and thus discounted the effect of confinement. The ultimate load of SCFFT was approximately 60% of that of its OCFFT counterpart. The key elements and basic framework used to develop a detailed analysis-oriented model for predicting FRP-confined SCAC under axial compression was illustrated. Furthermore, the model developed originally for FRP-confined lightweight concrete with ceramsite aggregates was extended to cover FRP-confined SCAC, and the extended model was confirmed to be capable of producing reliable predictions. (C) 2017 Elsevier Ltd. All rights reserved.