嵌入式复材筋加固混凝土桥面板工作性能研究

发布时间：2018-02-26 00:06

本文关键词： 嵌入式加固纤维复材筋桥面板有限元　出处：《玻璃钢/复合材料》2017年01期 　论文类型：期刊论文

【摘要】：为了研究表面嵌入式(Near Surface Mounted,简称"NSM")纤维复合筋(FRP筋)加固钢筋混凝土面板的工作性能,对该加固桥面板结构进行试验研究,并通过改变加固筋材类型和加固方式分析其对面板加固效果的影响。通过分析试验结果发现,嵌入式加固能有效提高桥面板承载力,减少面板板底开裂程度和挠度,增强面板刚度,但由于侧向约束刚度的作用筋材类型变化的影响较小。为了深入研究该加固桥面工作机理,对试验模型进行有限元模拟,数值模拟结果与试验结果对比吻合良好。此后采用该数值模型进行参数分析,深入研究混凝土强度、侧向刚度、跨高比、FRP筋弹性模量、加固率、配筋率等结构参数变化对加固桥面板承载性能的影响。参数研究结果表明:侧向刚度和配筋率增加能提高桥面板承载力,但加固效果减弱;桥面板承载力随混凝土强度、加固率和FRP筋弹性模量的增加而提高,但弹性模量变化对桥面承载力提高幅度较小;跨高比增加,桥面板承载力减小,但加固面板承载力提高幅度增长。试验研究和数值分析的结果表明,工程加固时应根据加固面板结构自身材料强度、约束刚度和配筋率选用合理的FRP筋类型和加固率,充分发挥加固材料的作用。
[Abstract]:In order to study the surface embedded (Near Surface Mounted, referred to as "NSM") fiber composite bar (FRP bar) performance of reinforced concrete slab reinforcement, the reinforcement of bridge deck structure is studied, and by changing the reinforcement effects of reinforcement and Reinforcement Analysis of the opposite type plate reinforcement effect. Through the analysis of the test results found that embedded reinforcement can effectively improve the bearing capacity of bridge deck slab bottom, reduce crack and deflection of reinforced panel stiffness, but due to the small effect of reinforcement type change lateral restraint stiffness. In order to study the working mechanism of bridge reinforcement, the finite element simulation of model test, numerical simulation and experiment results good agreement. Then using the numerical model parameter analysis, in-depth study of the concrete strength, lateral stiffness, span depth ratio, elastic modulus of FRP tendons, reinforcement ratio, reinforcement ratio and structure Influence of parameters on the bearing performance of strengthened bridge panel. Parametric study results show that the lateral stiffness and reinforcement ratio can increase the carrying capacity of bridge panel, but the reinforcement effect is weakened; bearing capacity of bridge deck with concrete strength, reinforcement ratio and increase FRP reinforced elastic modulus increased, but the change of elastic modulus increased slightly the bearing capacity of the bridge; span increase, reduce the bearing capacity of bridge deck, but the reinforcement panel increase bearing capacity. Growth test and numerical analysis results show that the reinforcement project should be based on reinforcement panel structure materials strength, restraint stiffness and reinforcement ratio of FRP bar type and reinforcement rate, give full play to the reinforcement the function of materials.

【作者单位】：东莞理工学院建筑工程系;
【基金】：广东省高等学校优秀青年教师培养计划(Yq2013155) 广东省交通厅科技计划(科技-2013-02-029)
【分类号】：U443.31

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