The residual strength and stiffness of concrete columns are decreased when exposed to elevated temperatures. This study proposes an external confinement provided by fiber-reinforced polymer (FRP) rehabilitate deficiencies that originate from fire damage. Recent studies show the efficiency this strategy is a function column cross-section geometry number FRP sheet layers applied. current investig...

the use of polymer composite (frp) as a reinforcement material for the repair and strengthening of important components of reinforced concrete structures, particularly columns, has found wide spread. in this study, the effect of intermediate layer on improving the confinement behavior of reinforced concrete columns has been investigated. to achieve the objectives of the study, 14 cylindrical re...

Owing to high specific strength and designability, unidirectional carbon fiber reinforced polymer (UD-CFRP) has been utilized in numerous fields to replace conventional metal materials. Post machining processes are always required for UD-CFRP to achieve dimensional tolerance and assembly specifications. Due to inhomogeneity and anisotropy, UD-CFRP differs greatly from metal materials in machini...

This paper presents results of testing eccentrically loaded columns externally wrapped with two types of materials. Six cylindrical (205 mm diameter and 925 mm height) plain columns were cast and tested. Half of the columns were wrapped with GFRP and the other half with CFRP. All columns were tested by applying an axial load at 50 mm eccentricity. In each group (GFRP or CFRP wrapped) of columns...

This research program is intended to verify the influence of using distributed external U-wrap CFRP anchorage to shift the failure mode from overall debonding to sectional flexural failure for concrete beams externally bonded with CFRP sheets. Premature cover delamination and FRP debonding are predominant failure modes in FRP flexural strengthening that may be delayed or prevented by using FRP ...

Carbonfiber-reinforced polymer (CFRP) composites are frequently utilized in the repair and reinforcement of reinforced concrete members because they more corrosion-resistant, durable, flexible than commonly used materials like steel plates. Many studies have demonstrated that use CFRP as an internal strengthening material has a substantial impact on shear capacity RC beams. This research looks ...

本研究では，鋼橋連結部周辺に生じる腐食損傷に対するCFRPシートを用いた補修工法に関する検討を行った．具体的には，H形鋼の上下フランジを添接板とトルシア型高力ボルトを用いて連結した鋼桁を製作し，4点曲げ試験を行った．ここでは，添接板際の鋼桁上下フランジ幅方向にザグリ加工を与え腐食損傷を模擬した．また，CFRPシート補修では従来の設計・施工マニュアルとは異なり，従前の基礎検討より，補修部のテーパー長を1:10から1:5に変更し，断面欠損部における高伸度弾性パテ材の塗布位置を不陸修正材上から鋼材表面とした．有限要素法による解析的検討も援用して，応力低減の観点から補修効果を評価したところ，設計・施工マニュアルから決定されるCFRPシート積層数ならびに今回の施工方法から，十分な補修効果が得られることが分かった．