本文選題：混凝土橋梁　切入點(diǎn)：加寬改造　出處：《桂林理工大學(xué)學(xué)報(bào)》2016年04期 　論文類型：期刊論文

【摘要】：為研究混凝土收縮徐變差及新舊結(jié)構(gòu)間的基礎(chǔ)沉降差對(duì)加寬后橋梁下部結(jié)構(gòu)可靠指標(biāo)的影響,以一座4×25 m多跨預(yù)應(yīng)力混凝土先簡(jiǎn)支后連續(xù)T梁橋(已運(yùn)營(yíng)15年、加寬后結(jié)構(gòu)的后續(xù)使用年限要求為85年)的加寬設(shè)計(jì)為對(duì)象,采用Midas建立空間梁格模型,用MATLAB軟件計(jì)算了加寬改造前后下部結(jié)構(gòu)的時(shí)變可靠性。結(jié)果表明:加寬改造后繼續(xù)運(yùn)營(yíng)85年,僅考慮混凝土收縮徐變差的影響時(shí),下部結(jié)構(gòu)的可靠指標(biāo)下降了16.20%,進(jìn)一步考慮新舊結(jié)構(gòu)間基礎(chǔ)沉降差的影響時(shí),下部結(jié)構(gòu)的可靠指標(biāo)則降低了32.59%。
[Abstract]:In order to study the influence of concrete shrinkage and creep difference and foundation settlement difference between new and old structures on reliability index of bridge understructure after widening, a 4 脳 25 m prestressed concrete bridge with simple support and continuous T-beam bridge has been in operation for 15 years. The widening design of the widened structure with a subsequent service life of 85 years is used as the object, and the spatial girder model is established by using Midas. The time-varying reliability of the substructure before and after the widening reconstruction is calculated by using MATLAB software. The results show that the continuous operation of the substructure is 85 years after the widening and reconstruction, and only the effect of shrinkage and creep of concrete is considered. The reliability index of the substructure is reduced by 16.20, and the reliability index of the substructure is reduced by 32.59when the influence of the difference of foundation settlement between the new and the old structures is further considered.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51278182)
【分類號(hào)】：U441

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本文編號(hào)：1573720