【摘要】：大跨徑混凝土連續(xù)剛構(gòu)橋是目前我國(guó)運(yùn)用較為普遍和成熟的橋型之一。但由于受地形條件、通航條件等因素的限制,通常會(huì)采取不對(duì)稱(chēng)布置。不對(duì)稱(chēng)連續(xù)剛構(gòu)在受力、變形、配筋及施工等方面異于對(duì)稱(chēng)結(jié)構(gòu)。近年來(lái),隨著交通量的增長(zhǎng)和重載車(chē)輛的不斷出現(xiàn),該類(lèi)橋型容易出現(xiàn)中跨合攏段下?lián)虾土后w不對(duì)稱(chēng)開(kāi)裂等病害(病害位置異于對(duì)稱(chēng)結(jié)構(gòu)),直接影響到橋梁結(jié)構(gòu)的安全性及耐久性,亟需對(duì)該類(lèi)病害的處置對(duì)策進(jìn)行研究,主要從以下幾個(gè)方面進(jìn)行:通過(guò)有限元軟件Midas/Civil對(duì)不對(duì)稱(chēng)連續(xù)剛構(gòu)橋與對(duì)稱(chēng)連續(xù)剛構(gòu)橋在結(jié)構(gòu)內(nèi)力、位移及應(yīng)力等方面進(jìn)行比較分析。針對(duì)大跨徑不對(duì)稱(chēng)連續(xù)剛構(gòu)橋出現(xiàn)的中跨合攏段下?lián)虾土后w不對(duì)稱(chēng)開(kāi)裂現(xiàn)象,以云南某大橋?yàn)橐劳泄こ?從設(shè)計(jì)、施工及其后期運(yùn)營(yíng)等方面進(jìn)行病害成因分析。采用橋梁有限元軟件Midas/Civil對(duì)依托工程建立模型,通過(guò)對(duì)不對(duì)稱(chēng)連續(xù)剛構(gòu)橋中跨合攏段持續(xù)下?lián)喜『Φ难芯糠治?提出采用不對(duì)稱(chēng)布置體外預(yù)應(yīng)力鋼束的加固設(shè)計(jì)方案,并對(duì)該方案進(jìn)行加固效果分析。對(duì)體外預(yù)應(yīng)力加固施工過(guò)程進(jìn)行有效的控制,通過(guò)對(duì)應(yīng)力、變形及裂縫的監(jiān)控,分析體外預(yù)應(yīng)力加固方案對(duì)提高橋梁承載能力、減少跨中下?lián)�、改善橋梁�?yīng)力狀況、抑制裂縫開(kāi)展等方面的效果,從而為大跨徑不對(duì)稱(chēng)連續(xù)剛構(gòu)橋的同類(lèi)型病害處置方法提供對(duì)策。
[Abstract]:Long span concrete continuous rigid frame bridge is one of the most popular and mature bridges in China. However, due to the constraints of terrain and navigation conditions, asymmetric arrangements are usually adopted. Asymmetric continuous rigid frame is different from symmetrical structure in force, deformation, reinforcement and construction. In recent years, with the growth of traffic volume and the continuous appearance of heavy-duty vehicles, this kind of bridge type is prone to appear such diseases as deflection in the middle span closure section and asymmetric cracking of the beam body (the position of the disease is different from that of the symmetrical structure). It directly affects the safety and durability of bridge structure, so it is urgent to study the countermeasures to deal with this kind of disease. The main contents are as follows: the internal force displacement and stress of asymmetric continuous rigid frame bridge and symmetrical continuous rigid frame bridge are compared and analyzed by finite element software Midas/Civil. In view of the phenomenon of deflection and asymmetric cracking of beams in the middle span closure section of long-span asymmetric continuous rigid frame bridge, the causes of the disease are analyzed from the aspects of design, construction and later operation based on a bridge in Yunnan Province. The bridge finite element software Midas/Civil is used to establish the model of the supporting engineering. Through the study and analysis of the continuous deflection in the span closure section of the asymmetric continuous rigid frame bridge, the reinforcement design scheme of the asymmetric arrangement of external prestressed steel beam is put forward. The reinforcement effect of the scheme is analyzed. Through monitoring the stress, deformation and crack, the external prestressing reinforcement scheme can improve the bearing capacity of the bridge, reduce the midspan deflection, and improve the stress condition of the bridge. The effect of restraining crack development and so on provides countermeasures for the treatment of the same type diseases of long span asymmetrical continuous rigid frame bridge.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U445.71

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