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1、橋梁是高速公路路網(wǎng)的重要組成部分。近些年來,現(xiàn)存舊橋所存在的問題越來越引起人們的關(guān)注。隨著橋梁服役時(shí)間的增長(zhǎng),交通量及荷載的增大,以及各種外部環(huán)境的不斷影響,許多橋梁正處于帶病害工作的階段,其中部分橋梁甚至已經(jīng)處于危險(xiǎn)狀況邊緣。綜合考慮及分析影響鋼筋混凝土橋梁的狀態(tài)評(píng)估各種影響因素,本文提出一種基于灰色模糊理論的改進(jìn)層次分析法,用于對(duì)現(xiàn)存鋼筋混凝土橋梁的實(shí)際狀態(tài)進(jìn)行評(píng)估。
這種方法所建立的模型是基于層次分析法而提出的一個(gè)有
2、效的評(píng)估指標(biāo)權(quán)重系統(tǒng),該系統(tǒng)包含針對(duì)橋梁各個(gè)部件所組成的比較數(shù)值(1至9)并由這些數(shù)值決定每個(gè)部件所占權(quán)重大小。而這些權(quán)重大小是由一致率CR所確定的。之后采用灰色模糊理論對(duì)評(píng)價(jià)權(quán)重進(jìn)行科學(xué)的計(jì)算,通過白化函數(shù),使得對(duì)影響因素的定性分析轉(zhuǎn)化成為定量分析,并減少評(píng)價(jià)對(duì)象的主觀性影響及使得評(píng)估對(duì)象更準(zhǔn)確、客觀、科學(xué)。這種模型合理的解決了在評(píng)估過程中由于橋梁檢測(cè)者的主觀評(píng)價(jià)而產(chǎn)生的不確定性。因此,這是一種對(duì)于了解橋梁結(jié)構(gòu)狀態(tài)的有效方法。
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