【摘要】：斜拉索作為斜拉橋的主要承重和傳力構(gòu)件,其質(zhì)量上要求具有良好的剛度、強(qiáng)度、抗疲勞強(qiáng)度以及耐久性。然而,斜拉索由于長期承受疲勞荷載,加之暴露在自然環(huán)境中,鋼絲索體和錨具結(jié)構(gòu)件遭受腐蝕破壞的可能性較大。斜拉索的損害會對斜拉橋的整體性能和正常運(yùn)行造成很大影響。對于斜拉橋來說,鋼材的應(yīng)力松弛、疲勞、腐蝕以及橋梁變形等不利因素的影響會使斜拉橋容易發(fā)生局部的破損。從表面上看這些局部破損雖并不會導(dǎo)致整個(gè)結(jié)構(gòu)短時(shí)間內(nèi)發(fā)生破壞,但從長期運(yùn)營來看,拉索損傷已經(jīng)對橋梁結(jié)構(gòu)的安全構(gòu)成了潛在的危險(xiǎn)。拉索局部破壞會導(dǎo)致斜拉橋整體剛度的下降以及承載能力的顯著降低,影響車輛的正常行駛,嚴(yán)重時(shí)斜拉橋甚至?xí)霈F(xiàn)失穩(wěn)破壞,這不僅會導(dǎo)致結(jié)構(gòu)自身使用壽命縮短,而且會對行人的生命和財(cái)產(chǎn)安全產(chǎn)生威脅。若能夠及時(shí)發(fā)現(xiàn)斜拉橋破損之處,并及時(shí)判斷出破損的程度以及破損的位置,維修人員就能準(zhǔn)確制定出可行的維修方案,并且及時(shí)對損傷部位進(jìn)行維修。本文主要研究內(nèi)容有以下幾方面:首先,簡述了斜拉橋的現(xiàn)狀和發(fā)展趨勢,并介紹了拉索性能特性,通過分析現(xiàn)有斜拉索使用過程的損傷狀況,提出斜拉橋拉索損傷危害性分析問題。其次,通過分析拉索不同情況損傷下橋梁結(jié)構(gòu)響應(yīng),發(fā)現(xiàn)斜拉橋主梁線形、拉索內(nèi)力、索塔位移以及橋梁動(dòng)力性能在拉索不同損傷情況下的變化規(guī)律。最后,根據(jù)拉索損傷及斷索危害性研究,結(jié)合拉索損傷檢測技術(shù),研究較為可行的檢測方法。提出通過對主梁、拉索以及主塔的健康監(jiān)測進(jìn)行斜拉橋健康狀態(tài)預(yù)警的可能性。
[Abstract]:As the main load-bearing and force-transfer member of cable-stayed bridge, the cable is required to have good stiffness, strength, fatigue strength and durability. However due to long term fatigue load and exposure to natural environment the cable body and anchor structure are more likely to be corroded and destroyed. The damage of cable will greatly affect the overall performance and normal operation of the cable-stayed bridge. For cable-stayed bridge, the influence of steel stress relaxation, fatigue, corrosion and bridge deformation will make the cable-stayed bridge prone to local damage. On the surface these local damage will not lead to the damage of the whole structure in a short time but from the long-term operation the cable damage has posed a potential danger to the safety of the bridge structure. The local failure of cable will lead to the decrease of the overall stiffness of cable-stayed bridge and the significant decrease of bearing capacity, which will affect the normal running of vehicles, and even lead to unstable damage of cable-stayed bridge when serious, which will not only shorten the service life of the structure itself, but also reduce the service life of the cable-stayed bridge. It also threatens the lives and property of pedestrians. If the damaged place of the cable-stayed bridge can be found in time and the degree and position of the damage can be judged in time, the maintenance personnel can accurately work out the feasible maintenance plan and carry out the repair of the damaged part in time. The main contents of this paper are as follows: firstly, the present situation and development trend of cable-stayed bridge are briefly described, and the performance characteristics of cable are introduced. The problem of cable damage analysis of cable-stayed bridge is put forward. Secondly, by analyzing the structural response of the cable-stayed bridge under different damage conditions, it is found that the main girder alignment, cable internal force, tower displacement and dynamic performance of the cable-stayed bridge change under different damage conditions. Finally, according to the research of cable damage and cable breakage, combined with cable damage detection technology, the more feasible detection method is studied. The possibility of early warning of the health status of cable-stayed bridge by monitoring the health of main girder, cable and tower is put forward.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441;U448.27

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本文編號：2301402