【作者】 吴照华；

【导师】 赵鸿铁；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2007， 硕士

【摘要】 木结构是我国古建筑的主要结构形式，我国现存大量的木结构民居、桥梁、寺庙、殿堂、塔、楼阁、衙署和牌坊等古建筑，但它们使用年数已久，结构残损严重，抗震能力严重不足，所以，古建筑的加固修复迫在眉睫。基于梁思成先生提出的古建筑“修旧如旧”的原则，应用碳纤维布加固(CFRP)技术是加固修复木结构的一条有效途径，能取得优良的加固与外观效果。然而国内外还没有碳纤维布加固木结构的技术规程，导致木结构加固设计无据可依，抑制了该项技术的推广应用。针对碳纤维布加固木梁的技术，基于国内外在此方面的研究现状，本文通过8根试件，证明碳纤维布加固木梁有着明显的加固效果，其强度和延性都有不同程度的增强，极限承载力大约提高18％～30％，并且粘贴两层CFRP布加固效果更加明显，同时，我们发现，碳纤维布加固木梁存在很大的离散性，木梁本身的天然材性(如含水率、木节、髓心、干缩裂缝、腐朽等)对于木梁的极限承载力的影响不可忽视。针对木梁的几种破坏状态，推导完成了CFRP加固矩形木梁的极限承载力的计算公式，并且尝试性的对二次受力情况给出了初步的推导。最后给出了判断CFRP加固的木梁破坏方式的界限破坏形态，应用公式计算了试件的承载力且与试件的试验值作了对比，试件的计算值和试验值基本吻合。应用C语言编制了CFRP布加固木梁的全过程分析程序，绘制了其弯距—曲率曲线；并与试验值进行了对比，最后应用程序对影响正截面承载力的截面尺寸、CFRP厚度等参数进行了对比分析，结果表明，木梁高度的影响程度明显大于其宽度的影响，与实际情况相符，计算值与试验值基本吻合，表明程序合理准确。更多还原

【Abstract】 Timber structure is the main structural style of traditional ancient buildings in China. However, large numbers of exiting ancient timber buildings such as houses,bridges, temple, and towers have been being in service for lots of years, and their structures have been greatly damaged so that the seismic capacity is not enough to resistant the major earthquake. So reinforcement of the traditional ancient buildings is extremely urgent. Based on the principle that repairs as old as before which suggestde by Mr. Liang sicheng,Using the technology of CFRP strengthening is an effective way to strengthen and rehabilitation timber structure. The perfect effect in strengthening and appearance can be obtained using the technology. However, there is not the technical specification for strengthening timber structures with carbon fiber reinforced polymer home and abroad, so that the design of strengthening timber structures accords to nothing. It is restrained heavily for the technology to be applied widely in engineering.On the basis of the study upon the present situation about CFRP strengthened wood member, through 8 specimens approved that the CFRP have obvious strengthen effect to the wood beam.,Both tehsility and ductility had been strengthed in vary degrees, the limit bearing capacity is increased about 18%～30%, and the strengthen effect is more obvious when Paste two layer of CFRP. At the same time, we find that the strengthen effect have great discreteness. The natrue of the wood such as water-content coefficient, wooden knot, heart-centre, crack, decay and so on, has noticeable function on the ultimate capacities of the wooden beam.In view of the wooden beam’s several kind of destruction condition, the formula of the ultimate capacities about the rectangle wooden beam which is reinforced by the CFRP is deduced in the thesis. the boundary destruction shape was given in the paper to judge the destroy way of the reinforced wooden beams, Ultimate capacities of the experimental beams are calculated using the formula presented in the paper, and compared the experimental value with the calculation, found that the two value is basically coincidence.A C program for the full-range analysis of the timber beams with externally bonded CFRP sheets has been developed. And the curve of the M-φis drawed , then compared the experimental value with the calculation,A good agreement between the results from the program and test can be found. The parametric study about those beams has been conducted using the program. The result indicated that the influence of the height is more obviously than the width of the timber beams. The result is agree with the actual situation. the two of the experimental value and the calculation is basically coincidence. All proved that the program is true.更多还原