掺入混杂纤维对混凝土墩柱耐海水腐蚀性能影响

发布时间：2019-06-06 10:03

【摘要】：海工环境下钢筋混凝土结构容易遭受氯离子腐蚀而导致结构过早损坏。在地震荷载和腐蚀的双重作用下,钢筋和混凝土桥墩的耐久性、安全性受到严重危害。在混凝土中掺入纤维,提高海水腐蚀环境下构件的使用寿命已成为目前研究的热点。本文采用高强、高弹模、亲水性能好的PVA纤维和钢纤维进行混杂,研究PVA-钢混杂纤维混凝土(PSFRC)桥墩在海水腐蚀环境下的抗震性能,主要作了以下工作:(1)首先,对比研究了PSFRC的工作性能、立方体抗压强度和抗劈拉强度。探讨了海水腐蚀前后PVA-钢混杂纤维对混凝土基本力学性能的影响,从PSFRC压、拉力学性能角度,分析PVA-钢混杂纤维在海工环境下对桥梁墩柱的可能影响。(2)其次,对PSFRC梁进行了弯曲韧性试验。研究掺入PVA-钢混杂纤维后在海水腐蚀环境下对混凝土弯曲韧性的影响。从PVA-钢混杂纤维在腐蚀环境下增强混凝土韧性和延性方面,分析PVA-钢混杂纤维在海工环境下对桥墩抗承载力、变形和耗能能力的影响。(3)最后,在力学试验的基础上,通过ABAQUS有限元软件,对PSFRC墩柱进行反复荷载作用下滞回特性、刚度退化、骨架曲线和耗能能力等相关方面进行对比分析,探讨了海水腐蚀环境下PVA-钢混杂纤维对混凝土桥梁墩柱抗震性能的影响。在海工环境下,为PVA-钢混杂纤维在桥梁墩柱的使用上提供可靠的依据。
[Abstract]:Reinforced concrete structures are vulnerable to chloride corrosion and lead to premature damage in marine environment. Under the dual action of seismic load and corrosion, the durability and safety of steel and concrete piers are seriously endangered. Adding fiber into concrete to improve the service life of members in seawater corrosion environment has become a hot research topic at present. In this paper, PVA fiber and steel fiber with high strength, high elastic mold and good hydrophilicity are used to study the seismic performance of PVA- steel hybrid fiber reinforced concrete (PSFRC) pier in seawater corrosion environment. The main work is as follows: (1) first of all, The working properties, cube compressive strength and split tensile strength of PSFRC were compared and studied. The effect of PVA- steel hybrid fiber on the basic mechanical properties of concrete before and after seawater corrosion is discussed. From the point of view of PSFRC compression and tensile properties, the possible influence of PVA- steel hybrid fiber on bridge pier column in marine environment is analyzed. (2) secondly, The bending toughness of PSFRC beam was tested. The effect of PVA- steel hybrid fiber on the bending toughness of concrete in seawater corrosion environment was studied. The influence of PVA- steel hybrid fiber on the bearing capacity, deformation and energy dissipation capacity of bridge pier in marine environment is analyzed from the aspect of toughness and toughness of concrete strengthened by PVA- steel hybrid fiber in corrosion environment. (3) finally, on the basis of mechanical test, Through ABAQUS finite element software, the hysteretic characteristics, stiffness degradation, skeleton curve and energy dissipation capacity of PSFRC pier columns under cyclic loading are compared and analyzed. The effect of PVA- steel hybrid fiber on seismic performance of concrete bridge piers under seawater corrosion is discussed. In marine environment, it provides a reliable basis for the use of PVA- steel hybrid fiber in bridge pier columns.
【学位授予单位】：苏州科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375

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