查晓雄¹，仓友清¹，王晓璐¹，钟善桐²
(1 哈尔滨工业大学深圳研究生院，深圳518055; 2 哈尔滨工业大学土木工程学院，哈尔滨150001)

[摘要] 随着基础建设的飞速发展，河砂资源短缺的矛盾日益凸显。储量丰富的海砂在力学性能方面和河砂相差不多，但海砂中的氯盐会腐蚀钢材，严重影响构件的耐久性。探讨了一种在钢管混凝土柱(CFST)中采用隔离方法合理安全应用海砂的新方法。具体做法是在钢管内壁铺设FRP薄板或FRP管。FRP材料轻质高强，耐腐蚀性能好，不仅可以有效隔离海砂中氯离子对钢管的腐蚀，并能提高构件的极限强度。主要研究了加入FRP管对钢管混凝土组合构件轴心受压力学性能的影响。通过有限元分析软件ABAQUS模拟得到了组合柱轴压极限强度随FRP管厚度，钢管厚度及屈服强度，混凝土轴心抗压强度，FRP纤维缠绕角度等因素的变化规律。
[关键词] 海砂；FRP；CFST；轴心受压；有限元模拟

Investigation of steel-FRP-sea sand concrete stubs under axial compressive loading
Zha Xiaoxiong¹, Cang Youqing¹, Wang Xiaolu¹, Zhong Shantong²
(1 Harbin Institute ofTechnology Shenzhen Graduate School, Shenzhen 518055,China; 2 Harbin Institute of Technology Civil Engineering School, Harbin 150001, China)

Abstract: With the rapid development ofinfrastructure, river sand supply shortage has become increasingly prominent while the sea sand storage is rich. The mechanical properties of sea sand are almost the same with river sand, but the chloride ion contained in sea sand causes corrosion of steel and seriously affects the durability of components. This article discusses a new isolation method of sea sand application in concrete-filled steel tubes. Specifically practice is to lay a FRP pipe or FRP sheet between steel pipe and the inner concrete. FRP material is widely used in structural field since its high strength and good corrosion resistance. FRP pipe can not only isolates chloride ion in sea sand, but also improves the ultimate strength of the component. This paper studied the contribution of FRP pipe to ultimate strength of component under axial compressive loading. Finite element analysis software ABAQUS has been used to simulate the behavior of component. Ultimate strength is obtained with the vibration of the thickness of FRP tubes, yield strength and thickness of steel tube, axial compressive strength of concrete, fiber orientation of FRP and so on.
Keywords: sea-sand; FRP; CFST; axial compressive loading; finite element modeling