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結構加固的基本方法
 

一、結構加固的基本方法

   1.預應力加固法

   2.增大截面加固法

   3.改變受力體系加固法

   4.粘鋼加固法

   5.外包鋼加固法

   6.纖維類材料加固修復混凝土結構技術

二、碳纖維加固修復混凝土結構技術

   碳纖維加固是采用同一方向排列的碳纖維織物,在常溫下用環氧樹脂膠粘貼于混凝土結構表面,利用其緊密粘著混凝土表面,使二者作為一個新的整體,共同受力,在不增加結構物荷重的前提下達到高效加固的目的。

三、特點

1.高強高效,碳纖維片的抗拉強度高于普通鋼1015倍,彈性模量與鋼接近;

2.具有良好的耐久性胡耐酸堿鹽各類化學介質的腐蝕,不需定期維護;

3.良好的耐熱和耐寒性長期在-5483條件下使用,強度不發生變化;

4.抗紫外線及核輻射,碳纖維片的強度和粘著性在50年時間內不發生劣化,在核輻射實驗室中可經受20年;

5.施工簡便,不受形狀限制,易貼附,施工質量易保證;

6.具有良好的耐水性,在70條件下,浸漬3天,抗拉強度不降低;

7.符合環保要求;

8.成為國際上建筑物結構補強加固新趨勢。

四、適用范圍

1.廣泛適用于梁、板、柱等構件及曲面、節點的結構補強及抗震加固;

2.鋼筋混凝土構件的裂縫加固;

3.滿足結構承受動靜載荷的需求,如橋梁橋墩、立交橫梁、橋板、橋面;

4.構件的抗彎、抗剪、抗壓加固,結構體系的抗震及砌體結構的加固。

五、我國發展狀況

我國在該領域的研發工作從1997 年開始起步, 98年才開始實際的工程應用。至目前為止,國內已有近十個科研院所、十余所高校對其技術性能進行研究,取得了大量的科研成果。由國家冶金建筑研究總院、清華大學等單位所承擔的國家“九五”重點科技攻關項目《碳纖維材料加固修復混凝土結構技術研究開發與應用》的系列科技成果已于2001 年通過國家鑒定,并編制了中國工程建設標準化協會標準《碳纖維片材加固修復混凝土結構技術規程》。

六、依據GB50367-2006《混凝土結構加固設計規范》,粘接材料粘合加固材與基體的正拉粘結強度現場測定方法及評定標準

使用范圍:本方法適用于現場條件下以結構膠粘劑或高強聚合物砂漿為粘接材料,粘合(包括澆注、噴抹)下列加固材料與基材在均勻拉應力作用下發生內聚、粘附或混合破壞的正拉粘結強度測定;

1.結構膠粘劑粘合纖維復合材與基材混凝土

2.結構膠粘劑粘合鋼板與基材混凝土

3.高強聚合物砂漿噴抹層粘合鋼絲繩網片與基材混凝土

 

 

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