CN201753531U - 一种预应力frp筋加固的混凝土结构件 - Google Patents

一种预应力frp筋加固的混凝土结构件 Download PDF

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CN201753531U
CN201753531U CN2010202613125U CN201020261312U CN201753531U CN 201753531 U CN201753531 U CN 201753531U CN 2010202613125 U CN2010202613125 U CN 2010202613125U CN 201020261312 U CN201020261312 U CN 201020261312U CN 201753531 U CN201753531 U CN 201753531U
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concrete structure
frp muscle
stress frp
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吴智深
吴刚
岩下健太郎
蒋剑彪
张敏
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Beijing Texida Research & Development Of Technology Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • E04C5/073—Discrete reinforcing elements, e.g. fibres
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B13/00—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
    • B32B13/04—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B13/12—Layered products comprising a a layer of water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material comprising such water setting substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/085—Tensile members made of fiber reinforced plastics
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0255—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements whereby the fiber reinforced plastic elements are stressed
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    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24612—Composite web or sheet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
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Abstract

本实用新型公开了一种混凝土结构件，尤其涉及一种预应力FRP筋加固的混凝土结构件。上述混凝土结构件包括预应力FRP筋和混凝土结构件本体，所述预应力FRP筋布置在混凝土结构件本体上，在预应力FRP筋周围设置将预应力FRP筋包裹的环氧树脂覆盖层，在所述环氧树脂覆盖层外设置聚合物混凝土增厚层。本实用新型中的混凝土结构件不仅可保证FRP筋材不会较早发生界面剥离破坏，而且可保证FRP筋材应力能够均匀有效的传递。

Description

一种预应力FRP筋加固的混凝土结构件
技术领域
本实用新型涉及一种混凝土结构件，尤其涉及一种预应力FRP筋加固的混凝土结构件。
背景技术
纤维增强复合材料(FRP)筋具有轻质、高强、耐腐蚀等特性，在土建工程中作为代替钢绞线、钢筋的材料，已经有了很大的应用，嵌入式FRP筋加固混凝土结构就是其主要应用技术之一，即将FRP筋放入结构表面预先开好的槽中，并向槽中注入粘结材料使之形成整体，以此来改善结构性能的加固技术，为充分发挥FRP筋的高强作用随后引入了预应力技术。FRP筋的这种技术应用能有效提高结构的刚度及抗弯、抗剪承载力。但其破坏模式不理想，往往发生界面过早剥离破坏、劈裂破坏。如FRP筋-粘结材料界面、混凝土-粘结材料界面，以及粘结材料劈裂、槽面附近混凝土劈裂破坏，这种过早破坏势必制约着FRP筋高强性能的发挥。
实用新型内容
本实用新型所要解决的技术问题是提供一种预应力FRP筋加固的混凝土结构件，该混凝土结构件不仅可保证FRP筋材不会较早发生界面剥离破坏，而且可保证FRP筋材应力能够均匀有效的传递。
本实用新型包括预应力FRP筋和混凝土结构件本体，所述预应力FRP筋布置在混凝土结构件本体上，在预应力FRP筋周围设置将预应力FRP筋包裹的环氧树脂覆盖层，在所述环氧树脂覆盖层外设置聚合物混凝土增厚层。
作为本实用新型的一种情况，在所述混凝土结构件的底面上开设一凹槽，上述预应力FRP筋布置在上述凹槽中；所述环氧树脂覆盖层填充在上述一部分凹槽中，将预应力FRP筋包裹；所述聚合物混凝土增厚层将其余的凹槽填充。为了保证足够的粘结层厚度，聚合物混凝土增厚层可做成凸丘状。优选地，上述凹槽的深度和宽度相等，是预应力FRP筋直径的1.5倍。
作为本实用新型的另一种情况，所述预应力FRP筋、环氧树脂覆盖层和聚合物混凝土增厚层布置在混凝土结构件底面上，聚合物混凝土增厚层将预应力FRP筋和环氧树脂覆盖层粘结在混凝土结构件本体的底面上。优选地，所述聚合物混凝土增厚层呈凸丘状。
在环氧树脂覆盖层和聚合物混凝土增厚层的作用下，本实用新型中的混凝土结构件可保证FRP筋材与混凝土结构件本体之间具有足够的粘结强度，不会较早发生界面剥离破坏。由于聚合物混凝土刚度比较大，限制了环氧树脂的变形，保证了FRP筋材应力均匀有效的传递。同时，聚合物混凝土与原混凝土本体有很好的粘结强度，而且，一定厚度的聚合物混凝土增厚层，也保证了界面优良的粘结性能，延迟界面粘结破坏的时间。凸丘状的聚合物混凝土增厚层使FRP筋材有足够的粘结厚度，避免了嵌入深度不够导致的粘结不充分。
附图说明
图1是本实用新型实施例1的结构示意图；
图2是本实用新型实施例2的结构示意图；
图3是三种试验效果曲线对比图。
具体实施方式
实施例1
如图1所示，本实施例中的预应力FRP筋加固的混凝土结构件，包括混凝土结构件本体1和预应力FRP筋2。在所述混凝土结构件本体1的底面开设一凹槽1-1，预应力FRP筋2布置在上述凹槽1-1中。
上述凹槽1-1的深度和宽度优选是相等的，是预应力FRP筋2直径的1.5倍。
在上述一部分凹槽1-1中设置环氧树脂覆盖层3。上述环氧树脂覆盖层3处于预应力FRP筋2周围，将FRP筋2包裹。在剩余的凹槽1-1中设置聚合物混凝土增厚层4。上述聚合物混凝土增厚层4将剩余的凹槽1-1填充后在混凝土结构件本体1的底面上可做成平面状或凸丘状。
实施例2
如图2所示，本实施例中的预应力FRP筋加固的混凝土结构件，包括混凝土结构件本体1′和预应力FRP筋2′。所述预应力FRP筋2′布置在混凝土结构件本体1′的底面。环氧树脂覆盖层3′处于预应力FRP筋2′周围，将FRP筋2′包裹。在所述环氧树脂覆盖层3′外设置聚合物混凝土增厚层4′，以将预应力FRP筋2′和环氧树脂覆盖层3′粘结在混凝土结构件本体1′的底面上。
如图3所示，在施加相同预应力的条件下，A曲线表示覆盖层和增厚层都是环氧树脂的情况；B曲线表示覆盖层和增厚层都是聚合物混凝土的情况；C曲线表示覆盖层是环氧树脂，增厚层是聚合物混凝土的情况。从图中可以看出，C的极限承载力较A和B高。A、B、C三种曲线中的a、b、c三点表示FRP筋材开始发生粘结剥离的时间点，其中C曲线表示的FRP筋材开始发生粘结剥离的时间点晚于A和B曲线表示的FRP筋材开始发生粘结剥离的时间点，即A和B在混凝土压碎之前，FRP筋材就开始发生粘结剥离，而C是在混凝土压碎之后，FRP筋材才开始发生粘结剥离，其延性较好。在承载和结构延性的提高程度上，C超过A和B两种情况。

Claims (6)

1.一种预应力FRP筋加固的混凝土结构件，其特征在于：包括预应力FRP筋和混凝土结构件本体，所述预应力FRP筋布置在混凝土结构件本体上，在预应力FRP筋周围设置将预应力FRP筋包裹的环氧树脂覆盖层，在所述环氧树脂覆盖层外设置聚合物混凝土增厚层。
2.根据权利要求1所述的预应力FRP筋加固的混凝土结构件，其特征在于：在所述混凝土结构件的底面上开设一凹槽，上述预应力FRP筋布置在上述凹槽中；所述环氧树脂覆盖层填充在上述一部分凹槽中，将预应力FRP筋包裹；所述聚合物混凝土增厚层将其余的凹槽填充。
3.根据权利要求2所述的预应力FRP筋加固的混凝土结构件，其特征在于：上述聚合物混凝土增厚层在混凝土结构件本体的底面上形成凸丘状。
4.根据权利要求2或3所述的预应力FRP筋加固的混凝土结构件，其特征在于：上述凹槽的深度和宽度相等，是预应力FRP筋直径的1.5倍。
5.根据权利要求1所述的预应力FRP筋加固的混凝土结构件，其特征在于：所述预应力FRP筋、环氧树脂覆盖层和聚合物混凝土增厚层布置在混凝土结构件底面上，聚合物混凝土增厚层将预应力FRP筋和环氧树脂覆盖层粘结在混凝土结构件本体的底面上。
6.根据权利要求5所述的预应力FRP筋加固的混凝土结构件，其特征在于：所述聚合物混凝土增厚层呈凸丘状。
CN2010202613125U 2010-07-16 2010-07-16 一种预应力frp筋加固的混凝土结构件 Expired - Fee Related CN201753531U (zh)

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CN102704703A (zh) * 2012-05-30 2012-10-03 东南大学 一种采用预应力碳纤维索托换大空间墙体的方法
CN103061270A (zh) * 2012-12-14 2013-04-24 北京中交路通科技发展有限公司 一种碳纤维筋桥隧喷浆加固翻新方法
CN103993752A (zh) * 2014-05-26 2014-08-20 中国矿业大学 一种用于恶劣环境下混凝土结构的修复加固方法
CN104233966A (zh) * 2014-10-22 2014-12-24 东莞理工学院 一种嵌入式的桥梁加固结构及加固方法
CN106149980A (zh) * 2016-08-19 2016-11-23 广东工业大学 嵌入式湿粘frp条带加固钢筋混凝土柱结构及加固方法
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CN102704703A (zh) * 2012-05-30 2012-10-03 东南大学 一种采用预应力碳纤维索托换大空间墙体的方法
CN103061270A (zh) * 2012-12-14 2013-04-24 北京中交路通科技发展有限公司 一种碳纤维筋桥隧喷浆加固翻新方法
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CN103993752B (zh) * 2014-05-26 2016-06-01 中国矿业大学 一种用于恶劣环境下混凝土结构的修复加固方法
CN104233966A (zh) * 2014-10-22 2014-12-24 东莞理工学院 一种嵌入式的桥梁加固结构及加固方法
CN104233966B (zh) * 2014-10-22 2016-05-25 东莞理工学院 一种嵌入式的桥梁加固结构及加固方法
CN106284105A (zh) * 2016-08-17 2017-01-04 浙江省嘉维交通科技发展有限公司 一种提高承载力的桥梁加固方法
CN106149980A (zh) * 2016-08-19 2016-11-23 广东工业大学 嵌入式湿粘frp条带加固钢筋混凝土柱结构及加固方法
CN110593922A (zh) * 2019-09-30 2019-12-20 新疆大学 嵌入式frp筋材加固巷道顶板的施工方法
CN110593922B (zh) * 2019-09-30 2021-06-08 新疆大学 嵌入式frp筋材加固巷道顶板的施工方法
CN116464313A (zh) * 2023-04-17 2023-07-21 中南大学 一种钢筋混凝土受弯加固构件及加固方法
CN116464313B (zh) * 2023-04-17 2024-01-30 中南大学 一种钢筋混凝土受弯加固构件及加固方法

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