复合管海水海砂混凝土柱轴压性能研究
摘要
开采与利用海砂资源，能够有效缓解目前河沙资源紧缺的现状，对于生态环境保护和地区基础建设有重大意义。本文结合结合国内外海水海砂混凝土的研究现状，主要针对钢管混凝土、FRP约束混凝土、复合管混凝土受压构件的力学性能研究与应用现状进行综述：随着径厚比的增加，圆形钢管混凝土加载端粘结应强度减小，且加载端与自由端有相似的荷载-滑移曲线；椭圆截面钢管混凝土的承载力随偏心距和截面长短轴比值的增大而显著降低；钢管混凝土的钢管在峰值荷载处屈服，而CFRP-钢复合管在荷载-轴向变形曲线第二线性段起点处屈服，后者对钢材的利用更彻底；双向电渗技术有较好的清除氯离子，防止锈蚀的作用；海水、海砂的使用对混凝土与GFRP筋间的黏结强度基本没有影响。这些研究成果说明了复合管海水海砂混凝土柱有广阔的应用前景。
关键词：FRP-钢复合管；海水海砂； 单调轴压； 应力应变模型；
Abstract
The exploitation and utilization of sea sand resources can effectively alleviate the shortage of river sand resources, which is great significance to the ecological environment protection and regional infrastructure construction. Combining with the domestic and foreign research in seawater and sea sand concrete ,this paper mainly aimed at summarizing the research and application of the mechanical properties in concrete filled steel tube,FRP confined concrete and composite tube concrete under compression.The loading end bond strength gradually decreases with the increase of the ratio of steel pipe diameter to thickness and the load-slip curve of the concrete loading end is similar to the free end ;The load bearing capacity decreases with the increase of load eccentricity or diameter ratio; The steel tube of STC ( steel tubed high-strength concrete) columns yields near the peak load，whereas the steel tube of C-STC (CFRP-steel composite tubed high-strength concrete) columns yields approximately at the initial point of the second linear part of the load versus deformation curves，which indicating a better utilization of the strength of steel tube; Bi-directional electromigration technique could play an excellent role in chloride extraction and rust resistance; Seawater and sea sand has little effect on the bonding strength between concrete and GFRP bars. These results show that the composite pipe seawater and sea sand concrete column has a broad application prospect.
Key words: FRP-steel composite tube; Sea sand concrete; Monotonic axial compression; axial stress-strain model
引言
近年来，伴随着经济的发展，基础建设投入越来越多，各国对于混凝土的需求日益增大。作为混凝土重要原材料之一，河砂的需求量也在日益增加。但河沙资源有限，过度利用容易引起生态环境的恶化。为了解决这一矛盾，研究人员将目光投向了海洋：海砂资源丰富，且沿海运输成本低。许多国家都开始研究海水海砂的处理应用，处理方式主要包括淡化处理和添加阻锈剂两种方法。伴随着FRP材料研究的兴起，FRP材料能有效避免氯离子的侵蚀的性质被发现。研究人员尝试将FRP材料与海水海砂进行组合，并指出该组合结构有广阔的应用前景。但目前关于这种组合的研究仍然不足，需要进行更多的探索试验。
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