钢-连续纤维复合筋珊瑚混凝土单向板受弯性能研究

doi:10.16552/j.cnki.issn1001-1625.2024.1141

摘要/Abstract

摘要： 兼顾钢筋与纤维增强复合材料(FRP)的优势,钢-连续纤维复合筋(SFCB)可与珊瑚混凝土结合,在远海岛屿的开发中具有良好的应用前景。为研究钢-连续纤维复合筋珊瑚混凝土单向板的受弯力学性能,以钢筋类型、纵筋配筋率和混凝土类型为变化参数,对6块单向板试件进行静力单调受弯试验,观察了单向板的受力破坏过程及形态,获取了受力全过程的弯矩-挠度曲线和材料应变分布,分析了变化参数对单向板受弯性能的影响。结果表明:SFCB试件的破坏模式与普通钢筋试件相似,属于正截面弯曲破坏,在混凝土开裂后具有更强的抗弯刚度,裂缝发展得到有效限制,与普通钢筋试件相比,极限弯矩提升了8.4%,但延性降低了12.7%;SFCB试件的抗弯刚度和承载力随配筋率减小而降低,但延性有所提升,最大提升幅度为71.2%;珊瑚骨料的表面多孔、微泵效应和脆性等特征导致SFCB珊瑚混凝土板试件的承载能力较高,变形能力较差,但其破坏形态与普通混凝土板试件相似;最后基于平截面假定,推导出SFCB混凝土单向板的极限弯矩计算公式,其计算值与试验值较为吻合。

关键词: 钢-连续纤维复合筋, 珊瑚混凝土, 单向板, 受弯性能, 承载力计算

Abstract: Steel-FRP composite bar (SFCB) has the advantages of both steel bars and fiber-reinforced polymer (FRP), and its excellent corrosion resistance can be combined with coral concrete, which has a good application prospect in the development of islands in the distant sea. In order to study the flexural mechanical properties of coral concrete unidirectional slabs reinforced by SFCB, six unidirectional plate specimens were subjected to static monotonic flexural loading test with varying parameters such as the steel bar type, longitudinal reinforcement ratio and concrete type. The failure process and morphology of the unidirectional slab under force were observed, the flexural moment-deflection curves and material strain distribution of the entire force process were obtained, and the influence of variation parameter on the flexural performance of the unidirectional slabs was analyzed. The results show that the failure mode of the SFCB specimen is similar to that of the ordinary steel specimen, which belongs to the flexural failure of normal cross-section, and has stronger bending stiffness after concrete cracking, the crack development is effectively limited. Compared with odinary steel specimen, the ultimate flexural moment is increased by 8.4%, but the ductility is reduced by 12.7%. The bending stiffness and bearing capacity of SFCB specimens decrease with the decrease of reinforcement ratio, but the ductility is improved, with a maximum increase of 71.2%. The surface porousness, micro-pumping effect and brittleness of coral aggregate lead to higher bearing capacity and poor deformation ability of SFCB coral concrete slab specimen, but its failure form is similar to that of ordinary concrete slab specimen. Finally, based on the assumption of flat cross-section, the formulas for calculating the ultimate flexural moment of concrete unidirectional slabs reinforced by SFCB are derived, and the calculated values are in good agreement with the test values.

Key words: SFCB, coral concrete, unidirectional slab, flexural performance, calculation of bearing capacity

中图分类号:

TU375.2

梁莹, 覃伟恒, 陈宗平, 李志彬. 钢-连续纤维复合筋珊瑚混凝土单向板受弯性能研究[J]. 硅酸盐通报, 2025, 44(5): 1703-1716.

LIANG Ying, QIN Weiheng, CHEN Zongping, LI Zhibin. Flexural Performance of Coral Concrete Unidirectional Slabs Reinforced by SFCB[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1703-1716.

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