目的:溫度對大跨度橋梁的力學(xué)性能影響顯著。針對大跨度鋼箱梁懸索橋,本文采用數(shù)值方法分析日溫度變化引起的結(jié)構(gòu)靜力響應(yīng),對比設(shè)計車荷載,以評估溫度靜力效應(yīng)的影響。創(chuàng)新點:1.基于數(shù)值方法對比大跨度懸索橋溫度靜力效應(yīng)與設(shè)計車荷載效應(yīng),評估溫度效應(yīng)的影響;2.闡明懸索橋主要構(gòu)件溫度效應(yīng)對總體溫度效應(yīng)的貢獻及相互之間的影響。方法:1.建立現(xiàn)場環(huán)境和結(jié)構(gòu)響應(yīng)的結(jié)構(gòu)健康監(jiān)測系統(tǒng),并進行長期監(jiān)測;2.通過精細化有限元分析方法實現(xiàn)橋梁溫度荷載和溫度效應(yīng)的精準數(shù)值計算。結(jié)論:1.溫度對大跨度懸索橋跨中位移的影響明顯,其一天的變化約是設(shè)計車荷載位移的10%;箱型主梁橫向溫差是導(dǎo)致橋面橫向傾斜的主要因素。2.箱梁溫度應(yīng)力顯著大于車荷載引起的應(yīng)力;部分次要構(gòu)件的溫度應(yīng)力成為主要荷載效應(yīng)。3.主纜豎向傾角越大,溫度應(yīng)力越大;吊桿溫度效應(yīng)主要受其長度和兩端相對變形的影響。4.橋塔溫度效應(yīng)不僅受其自身溫度的影響,也會受到來自主纜溫度響應(yīng)的較大影響。5.本文結(jié)論是基于一天溫度變化的影響,而溫度效應(yīng)在更大時間尺度上的影響會更為嚴重。 

【文章來源】：Journal of Zhejiang University-Science A（Applied Physics & Engineering）. 2020,21(07)EISCICSCD

【文章頁數(shù)】：13 頁

【文章目錄】：
1 Introduction
2 Engineering background
    2.1 Humber Bridge
    2.2 Humber Bridge SHM system
3 FE models
    3.1 FE model for thermal analysis
    3.2 FE model for structural analysis
4 Thermal analysis of the suspension bridge
5 Structural static response analysis
    5.1 Static responses due to design vehicle load
    5.2 Temperature-induced static responses
        5.2.1 Temperature-induced vertical displacement at the mid-span
        5.2.2 Temperature-induced lateral inclination of the bridge deck at the mid-span
        5.2.3 Temperature-induced strain on the box girder
        5.2.4 Temperature-induced strain in the main cable
        5.2.5 Temperature-induced strain on the hanger
        5.2.6 Temperature-induced strain on the tower
6 Conclusions
Contributors
Conflict of interest


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