【摘要】：近年來,我國對古建筑的加固修復(fù)越來越重視,在古建筑中獨(dú)樹一幟的石建筑也隨之引起人們的關(guān)注。目前,已有的對石質(zhì)構(gòu)件的加固方法主要有碳纖維布加固、碳纖維筋加固、預(yù)應(yīng)力加固和鋼筋網(wǎng)砂漿加固等。研究發(fā)現(xiàn),這些加固方法大多并不宜直接應(yīng)用于文物建筑中,因為它們在不同程度上對原構(gòu)件造成了一定的損傷,且很難實(shí)現(xiàn)古建筑可逆性的加固原則,在古建筑加固中有一定的局限性。此外,相關(guān)試驗試件尺寸較小,而實(shí)際結(jié)構(gòu)中多為大型構(gòu)件,尺寸效應(yīng)對試驗誤差的影響不容忽視。針對以上情況,本文在對石材材性試驗的基礎(chǔ)上,研發(fā)了體外預(yù)應(yīng)力加固和角鋼-PET帶組合加固兩種新型、實(shí)用的加固方法,并進(jìn)行了23個大型石梁構(gòu)件的受力性能試驗,石材選用北京市古建筑中應(yīng)用較多的青白石和漢白玉兩種石材。分別研究了未加固石梁的受彎性能、3種不同加固方法加固石梁(CFRP加固、體外預(yù)應(yīng)力加固、角鋼-PET帶組合加固)的受彎性能、未加固石梁的受剪性能、CFRP加固石梁的受剪性能。同時,對加固前后石梁的受力性能進(jìn)行了對比分析。試驗結(jié)果表明:(1)加固后,石梁的極限受彎承載力均有所提高,變形能力較未加固石梁典型的脆性破壞有所改善,且加固石梁斷裂后仍有一定的承載力裕量;(2)石梁的抗剪能力較強(qiáng),試驗中均未出現(xiàn)石梁的剪切破壞,剪切破壞的工況在實(shí)際加固工程中僅需適當(dāng)考慮;(3)開裂前,加固及未加固石梁跨中截面基本滿足平截面假定,極限受彎承載力與石材材質(zhì)、具體加固措施等有關(guān)。通過試驗數(shù)據(jù)與理論分析的對比,提出了加固及未加固石梁受彎承載力及受剪承載力的簡化計算公式,計算結(jié)果與試驗結(jié)果吻合較好,對實(shí)際加固修復(fù)工程有一定的指導(dǎo)意義,實(shí)際加固工程中可根據(jù)具體的施工條件、經(jīng)濟(jì)條件等因素綜合選取適宜的加固方法。
[Abstract]:In recent years, more and more attention has been paid to the reinforcement and restoration of ancient buildings. At present, the existing methods of strengthening stone members mainly include carbon fiber sheet reinforcement, carbon fiber reinforcement, prestress strengthening and reinforcement with mesh mortar, etc. It is found that most of these reinforcement methods are not suitable for direct application in cultural relic buildings, because they have caused certain damage to the original members in varying degrees, and it is difficult to realize the reinforcement principle of the reversibility of ancient buildings. There are some limitations in the reinforcement of ancient buildings. In addition, the size of the related test specimen is small, but the actual structure is mostly large, so the effect of size effect on the test error can not be ignored. In view of the above situation, on the basis of the tests on the properties of stone, two new and practical strengthening methods, external prestressed reinforcement and angle steel-PET combined reinforcement, are developed, and the mechanical performance tests of 23 large stone beam members are carried out. Stone used in ancient buildings in Beijing more use of green white stone and white jade two kinds of stone. The flexural behavior of unstrengthened stone beams, the flexural behavior of three different strengthening methods (CFRP reinforcement, external prestressing strengthening, angle steel-PET combined reinforcement), the shear behavior of unstrengthened stone beams and the shear behavior of CFRP strengthened stone beams are studied respectively. At the same time, the stress behavior of stone beam before and after reinforcement is compared and analyzed. The experimental results show that: (1) after strengthening, the ultimate flexural bearing capacity of the stone beam is improved, and the deformation capacity is improved compared with the typical brittle failure of the unstrengthened stone beam. And there is still a certain bearing capacity margin after the fracture of the strengthened stone beam. (2) the shear ability of the stone beam is relatively strong, there is no shear failure of the stone beam in the test, and the shear failure condition only needs to be properly considered in the actual strengthening project; (3) before the cracking, The cross section of the reinforced and unstrengthened stone beams basically meets the assumption of the horizontal section. The ultimate flexural capacity is related to the material of stone and the concrete reinforcement measures. By comparing the experimental data with the theoretical analysis, a simplified formula for calculating the flexural and shear bearing capacity of reinforced and unstrengthened stone beams is proposed. The calculated results are in good agreement with the experimental results, which is of certain guiding significance to the practical reinforcement and repair works. According to the concrete construction conditions, economic conditions and other factors, the appropriate reinforcement method can be comprehensively selected in the actual reinforcement project.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU363

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本文編號：2270945