本文選題：碳纖維混凝土　切入點(diǎn)：鋼纖維混凝土　出處：《天津大學(xué)》2014年碩士論文

【摘要】：在建筑工程中普遍存在著溫度裂縫問題，溫度裂縫給結(jié)構(gòu)造成了很大的危害。本文研究了橋梁擋風(fēng)板上碳纖維混凝土加固板的溫度裂縫問題，橋梁擋風(fēng)板靠近路面一側(cè)用碳纖維混凝土加固板加固，置于自然環(huán)境下的橋梁擋風(fēng)板，根據(jù)一天中日照方位的變化，橋梁擋風(fēng)板在某一時(shí)間碳纖維混凝土加固板一側(cè)處于陽面、另一側(cè)處于陰面，或者碳纖維混凝土加固板一側(cè)處于陰面、另一側(cè)處于陽面，或者兩側(cè)同時(shí)受日光照射，根據(jù)這三種日照情況設(shè)置三種溫度工況，利用FINAL有限元軟件進(jìn)行裂縫分析。由于擋風(fēng)板兩側(cè)的溫差和材料線膨脹的不同，使得擋風(fēng)板兩側(cè)的形成變形差，本文研究由于溫度變形的不協(xié)調(diào)而產(chǎn)生的裂縫。 關(guān)于材料內(nèi)部溫度梯度分布的模型有雙折線模式、冪函數(shù)模式、指數(shù)函數(shù)模式等。為了簡化計(jì)算分析，本文不研究因?yàn)椴牧蟽?nèi)部溫度不均勻產(chǎn)生溫度自應(yīng)力對(duì)材料開裂的影響，將鋼筋混凝土擋風(fēng)板統(tǒng)一設(shè)置一個(gè)溫升值，，將纖維混凝土加固板統(tǒng)一設(shè)置一個(gè)溫升值。 在模型建立中，纖維混凝土加固板與鋼筋混凝土擋風(fēng)板之間的連接簡化為兩種極限連接情況：（1）兩者之間共用節(jié)點(diǎn)，并且相應(yīng)的位置有螺栓連接。（2）兩者之間采用非共用節(jié)點(diǎn)，只是用相應(yīng)位置的螺栓連接。 通過有限元分析結(jié)果得出：日照方位不同，纖維混凝土加固板的開裂情況不同；在相同條件下鋼纖維混凝土加固板要比碳纖維混凝土加固板的溫度裂縫少；纖維混凝土加固板的纖維分布情況和板厚均對(duì)加固板的開裂有一定的影響。
[Abstract]:The temperature crack is a common problem in the building engineering, and the temperature crack causes great harm to the structure.In this paper, the temperature crack of the CFRP reinforced slab on the bridge windshield is studied. The bridge windshield is strengthened with CFRP reinforced slab near the road surface, and the bridge windshield is placed in the natural environment.According to the change of sunshine azimuth during the day, the bridge windshield is on one side of the positive side, the other side on the shade, or the carbon fiber reinforced concrete plate on one side and the other side on the sunny side at a certain time.Or both sides are exposed to sunlight at the same time. According to the three kinds of sunlight, three kinds of temperature conditions are set up, and the crack analysis is carried out by using FINAL finite element software.Because of the difference of temperature difference and material linear expansion on both sides of the windshield, the deformation difference between the two sides of the windshield is different. The cracks caused by the incongruity of temperature deformation are studied in this paper.The models of temperature gradient distribution in materials include double broken line model, power function model, exponential function model and so on.In order to simplify the calculation and analysis, this paper does not study the effect of temperature self-stress on material cracking due to the uneven temperature inside the material, so the reinforced concrete windshield is uniformly set up as a temperature appreciation.The fiber reinforced concrete plate is uniformly set up for a temperature appreciation.In model building, the connection between fiber reinforced concrete reinforced slab and reinforced concrete windshield is simplified as two kinds of limit connection case: 1) the joint is shared between them, and the corresponding position is bolted connection.It is only connected by bolts in the corresponding position.The results of finite element analysis show that the crack of fiber reinforced concrete slab is different with different sunshine azimuth, and the temperature crack of steel fiber reinforced concrete plate is less than that of carbon fiber reinforced concrete plate under the same conditions.The fiber distribution and thickness of fiber reinforced concrete (FRC) plates have some influence on the cracking of the strengthened slabs.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.7

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 趙莉弘,朋改非,祁國梁,劉葉鋒;高溫對(duì)纖維增韌高性能混凝土殘余力學(xué)性能影響的試驗(yàn)研究[J];混凝土;2003年12期

2 馬亞峰;安明U

本文編號(hào)：1714244