采用與土木工程施工特點相適應的傳感器安裝工藝與保護方法, 將光纖B ragg 光柵(FBG) 埋于正在建設的呼蘭河大橋預應力箱梁中, 測量了預應力張拉過程中混凝土結構內部的應變變化。結果表明,FBG 顯示了良好的傳感性能, 能夠監測混凝土內部應變狀態, 發揮出成活率高、絕對值測量和壽命長等優勢, 為建立結構健康監測系統奠定了基礎。
關鍵詞: 光纖B ragg 光柵(FBG) ; 應變; 傳感器; 預應力
Abstract: F iber B ragg grat ing (FBG) st rain senso rs w ere characterized and embedded into the p re2 st ressed concrete beam of HuL an river bridge. Embedding techniques and p ro tect ivemethods suitable fo r civil engineering w ere p resented. W ith FBG senso rs, internal st rains of the concrete beam w ere deter2 m ined during the st ressing p rocess. FBG senso rs show the advantages of st rong surviving capability, ab2 so lute value measurement and long service life over convent ional elect rical st rain gauge in experiments. The results indicate that it is po ssible to establish a st ructural health monito ring system based on fiber op t ic senso rs.
Key words: F iber B ragg Grat ing (FBG) ; St rain; Senso r; P rest ress