碳纖維介面強度試驗與搭接對圍束效果影響之探討

A Study on Testing Interface Strength of CFRP sheets and the Confining Effect with a Lap Splice

李宗龍(Chung-Lung Lee)

指導教授 ： 林至聰

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2012年)

https://doi.org/10.6841/NTUT.2012.00441

摘要

碳纖維強化高分子複合材料（Carbon Fiber Reinforced Polymer、簡稱CFRP）具備高拉力強度、高耐久性和不改變補強構件外觀等優點，其應用於RC梁剪力補強與RC柱剪力與圍束補強之行為已為廣泛研究與討論；過去研究證實，碳纖維補強效果常受碳纖維介面強度影響，因此相關設計準則(ACI 440.2R)建議設計時，必須按照混凝土強度、碳纖維用量與補強形式等條件計算碳纖維有效設計應變，做為具備安全性與合理之補強設計。本文為探討”碳纖維-碳纖維”與”碳纖維-混凝土”間之介面強度，以量化之實驗結果提供設計參考；碳纖維圍束補強RC柱可提供柱圍束，提升混凝土軸壓強度與軸壓軸韌性，然而文獻與相關設計準則對圍束碳纖維間之搭接長度需求與建議較為欠缺，碳纖維搭接介面為「碳纖維-碳纖維」型式，本文設計一系列試體試驗碳纖維間之搭接強度，以搭接面積為變量求得量化之強度試驗成果，同時規劃混凝土圓柱試體圍束試驗，利用相關數學模型驗證圍束補強時碳纖維搭接處所提供之等效圍束力。
試驗結果顯示，黏著材料對黏著介面強度有顯著之影響，「碳纖維-碳纖維」高於「碳纖維-混凝土」介面強度；而圍束補強試驗結果顯示，本研究採用槽型圍束之效果高於雙U型圍束，1層碳纖維槽型圍束可提升標準規格之混凝土圓柱試體強度約2.9倍，而雙U型圍束提升混凝土強度最高為2.2倍，且搭接長度需求較高。同時，本文提出根據碳纖維材料強度與試驗介面強度之搭接長度理論，可得保守之搭接長度設計，而混凝土圍束之數值分析模型以L.L. Model與試驗比對結果最為合理，可提供碳纖維補強之實務或分析參考。

關鍵字

碳纖維圍束 ； 搭接長度 ； 介面強度

並列摘要

After the 921 earthquake, the reinforcement of the reinforced concrete structure needs grow with each passing day, the carbon fiber polymer composites with high strength, simple construction and resistant to corrosion and other advantages of the structural reinforcement materials applied to the RC beam shear reinforcing RC columns, shear and confinement reinforcement of behavior has been extensively studied and discussed; past studies confirm, and carbon fiber reinforcement effect is often affected by the carbon fiber interface strength of the design criteria (ACI 440.2R) the proposed design, in accordance with the strength of concrete , the amount of carbon fiber reinforcement in the form of conditions to calculate the carbon fiber to effectively design strain, as have the security and rational reinforcement design.
Reference design this study to explore the overlap between the carbon fiber patch strength in order to quantify the experimental results; carbon fiber confinement reinforcement RC column to column confinement to enhance the axial compression strength and the axis of the finale of toughness, however, literature and design criteria overlap length between the requirements and recommendations in the confined carbon fiber is more lacking in this study to design a series of overlap between the specimen test carbon fiber strength, seek to quantify the strength test results for the variable to the length and width of the lap, while planning the concrete the cylindrical specimens confined test, using the mathematical model to verify the equivalent confinement of confinement reinforcement, carbon fiber lap premises.

並列關鍵字

CFRP Confineing ； Lap Splicee ； Interface strength

參考文獻

【28】 葉書銘，“碳纖維貼片補強RC梁構件之有限元素分析”，台北科技大學土木與防災所碩士論文,民國95年7月

【38】 吳穎涵，「矩形RC柱採碳纖維包覆暨碳纖維錨栓耐震補強研究」，碩士論文，國立台北科技大學，2008，台北。

【39】 黃志豪，「矩形RC梁採碳纖維包覆暨碳纖維錨栓耐震補強研究」，碩士論文，國立台北科技大學，2009，台北。

【1】 ASTM, C39/C39M-03,Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens

【2】 ACI 440 Report, “Guide for the Design and Construction of Externally Bounded FRP Systems for Strengthening Concrete Structures”, ACI 440.2R-02, 2002, Detroit.