采用與土木工程施工特點(diǎn)相適應(yīng)的傳感器安裝工藝與保護(hù)方法, 將光纖B ragg 光柵(FBG) 埋于正在建設(shè)的呼蘭河大橋預(yù)應(yīng)力箱梁中, 測(cè)量了預(yù)應(yīng)力張拉過程中混凝土結(jié)構(gòu)內(nèi)部的應(yīng)變變化。結(jié)果表明,FBG 顯示了良好的傳感性能, 能夠監(jiān)測(cè)混凝土內(nèi)部應(yīng)變狀態(tài), 發(fā)揮出成活率高、絕對(duì)值測(cè)量和壽命長(zhǎng)等優(yōu)勢(shì), 為建立結(jié)構(gòu)健康監(jiān)測(cè)系統(tǒng)奠定了基礎(chǔ)。
關(guān)鍵詞: 光纖B ragg 光柵(FBG) ; 應(yīng)變; 傳感器; 預(yù)應(yīng)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