本文關(guān)鍵詞： 斜拉橋 營運(yùn)狀態(tài) 檢測 靜載試驗 動載試驗　出處：《石家莊鐵道大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：斜拉橋以適用跨徑范圍廣、造型美觀多樣等特點(diǎn),至從上世紀(jì)80年代以后,便首先在我國研究和推廣使用,目前,已經(jīng)建造了上百座,而且跨度紀(jì)錄也不斷被刷新。但由于受當(dāng)時設(shè)計標(biāo)準(zhǔn)、施工水平、長期超載、養(yǎng)護(hù)維修不善、偶然事故、以及構(gòu)造認(rèn)識不足等因素的綜合影響,一些橋梁在使用期限內(nèi)就出現(xiàn)了斜拉索老化、錨固失效等病害,很多橋梁都進(jìn)行了換索施工,仍有大批在役橋梁需要加強(qiáng)維護(hù)及加固。本文以某斜拉橋工程為背景,重點(diǎn)對橋梁營運(yùn)狀態(tài)進(jìn)行檢測及安全性能評定具有較重要的工程意義。本文以某大橋主跨斜拉橋為依托,對該橋進(jìn)行了常規(guī)檢測和特殊檢測,依據(jù)檢測結(jié)果對橋梁的工作狀態(tài)進(jìn)行了初步判定;按規(guī)范法對橋梁承載能力進(jìn)行了復(fù)核,依據(jù)規(guī)范對橋梁進(jìn)行了綜合評定,采用有限元軟件建模,對橋梁靜動力性能進(jìn)行了模擬計算,與通過靜載、動載試驗,深入考察了橋梁的工作行為,得出了橋梁在典型最不利加載狀態(tài)時的響應(yīng),結(jié)果表明:主要測點(diǎn)撓度、應(yīng)力最大效驗系數(shù)為0.85,最大殘余變位和應(yīng)變均小于20%,在最大試驗荷載作用下,斜拉橋跨梁底沒有出現(xiàn)裂縫,橋梁基礎(chǔ)未發(fā)生不穩(wěn)定沉降變位。脈動試驗結(jié)果表明,大橋主橋斜拉橋豎向彎曲自振頻率為1.76Hz,大于理論計算頻率,說明該橋剛度滿足設(shè)計要求;主梁前3階豎向振型的阻尼比分別為4.32%、2.59%、3.53%,跨中截面實(shí)測沖擊系數(shù)1+μ介于1.05~1.12之間,其值在同類橋梁常值范圍內(nèi)。由此可知,該大橋主橋斜拉橋承載能力滿足設(shè)計荷載等級汽車-20、掛-100的要求,結(jié)構(gòu)處于彈性工作狀態(tài)。
[Abstract]:Since -20s, cable-stayed bridge has been studied and popularized in our country for its wide span and various shapes. At present, hundreds of cable-stayed bridges have been built. But due to the design standards, construction level, long-term overload, poor maintenance and maintenance, accidental accidents, and lack of structural awareness. Some bridges have been damaged by the aging of stay cables and the failure of anchoring during the service life. Many bridges have carried out cable replacement construction. There are still a large number of existing bridges need to be strengthened and strengthened. This paper takes a cable-stayed bridge project as the background. It is of great engineering significance to test the operation state and evaluate the safety performance of the bridge. Based on the cable-stayed bridge of a certain bridge, this paper carries on the routine inspection and the special inspection to the bridge. Based on the test results, the working state of the bridge is preliminarily determined. The bearing capacity of the bridge is checked according to the code method, the bridge is evaluated synthetically according to the code, the static and dynamic performance of the bridge is simulated and calculated by the finite element software, and the static load and dynamic load test is carried out. The working behavior of the bridge is thoroughly investigated and the response of the bridge under the typical most unfavorable loading state is obtained. The results show that the deflection of the main measuring points and the maximum effective coefficient of stress are 0.85. The maximum residual displacement and strain are less than 20. Under the maximum test load, there are no cracks at the bottom of the span beam of the cable-stayed bridge, and no unstable settlement displacement occurs on the bridge foundation. The pulsating test results show that. The vertical bending natural vibration frequency of the main cable-stayed bridge is 1.76 Hz, which is larger than the theoretical calculation frequency, which shows that the stiffness of the bridge meets the design requirements. The damping ratio of the first three vertical modes of the main beam is 4.32 and 2.593.53, respectively, and the measured impact coefficient of the mid-span section is between 1.05 and 1.12. The bearing capacity of the cable-stayed bridge of the main bridge can meet the requirements of design load grade automobile -20 and hang-100, and the structure is in an elastic working state.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446;U448.27

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本文編號：1449784