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              預應力高強鋼絲繩加固鋼筋混凝土板梁試驗研究

              預應力高強鋼絲繩加固鋼筋混凝土板梁試驗研究

              來源:本站原創 作者:佚名 瀏覽:1867次

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              預應力高強鋼絲繩加固鋼筋混凝土板梁試驗研究摘要:預應力高強鋼絲繩加固法是一種新興的加固補強技術,其加固原理是通過對預應力高強鋼絲施加預應力來抵消部分外荷產生的內力,從而提高梁體的承載力,改善梁體的使用功能。本文針對2片服役13年的鋼筋混凝土板梁,進行加固前后荷載試驗,分析比對板梁撓度、應力、裂縫試驗數據。結果表明,預應力高強鋼絲繩加固能夠顯著提高鋼筋混凝土板梁的剛度及承載能力,有效抑制裂縫開裂寬度,該技術值得在實際橋梁維修加固工程大力推廣應用。關鍵詞:預應力高強鋼絲繩;鋼筋混凝土;板梁;加固1.試驗概況1.1 試驗梁概況該橋位于天津市某高速公路上,建成于2004年。橋梁設計荷載標準:汽車—超20級、掛車—120,上部結構采用跨徑為8m的鋼筋混凝土板梁,單幅橋面橫向布置為:0.5m(防撞墻)+3×3.75m(車行道)+0.75 m(中央分隔帶)橋梁每跨長度為8m。板梁底板配置11根直徑25mm的二級鋼筋,混凝土標號為C30。為分析預應力鋼絲繩加固對鋼筋混凝土梁受力性能的改善,選取2片梁進行……


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