帶填充墻木框架抗震性能及加固方法研究
發(fā)布時(shí)間：2018-09-13 06:39
【摘要】：中國(guó)傳統(tǒng)古建筑以木結(jié)構(gòu)為主,并賡續(xù)近幾千年,但如今完整保留下來(lái)的卻是甚少。此外,在我國(guó)廣西、云南等地的農(nóng)村,以木構(gòu)架作為承重結(jié)構(gòu)、砌體作為圍護(hù)墻房屋仍是居民住房的一種主要形式。目前國(guó)內(nèi)外對(duì)木框架結(jié)構(gòu)的研究不斷增多,并取得一定的研究成果,但是對(duì)于帶填充墻的木框架研究還是非常少。鑒于此,本文參照清代《工程做法則例》,制作了帶砌體填充墻的燕尾榫木框架,對(duì)其抗震性能以及加固方法進(jìn)行研究。本文首先完成了三榀帶填充墻木框架低周反復(fù)荷載下的試驗(yàn)研究,第一榀框架直接進(jìn)行低周反復(fù)加載試驗(yàn),第二、三榀框架以最大程度不改變構(gòu)件原貌(參考古建筑維修原則)為目的,并結(jié)合第一榀框架中填充墻破壞形態(tài),對(duì)其填充墻采取了水平灰縫嵌筋、墻邊緣濕法粘貼鋼板進(jìn)行加固。其中,第二榀框架中的填充墻需進(jìn)行預(yù)開(kāi)裂后再加固,而第三榀中的填充墻直接進(jìn)行加固。基于試驗(yàn)研究與理論分析,得到三榀框架的破壞機(jī)制、滯回曲線、骨架曲線、承載力、強(qiáng)度退化、剛度退化、延性和耗能能力等抗震性能指標(biāo),并對(duì)此種加固方法的效果進(jìn)行評(píng)估。試驗(yàn)研究結(jié)果表明,無(wú)論加固與否帶填充墻木框架的滯回曲線都呈現(xiàn)Z型,破壞主要呈現(xiàn)剪切破壞,并存在明顯剪切滑移,耗能能力較差,木框架對(duì)填充墻有較強(qiáng)的圍護(hù)作用,當(dāng)?shù)竭_(dá)極限荷載后,強(qiáng)度并不會(huì)下降的很快,后期延性比較大；第二、三榀框架名義屈服荷載相對(duì)第一榀框架平均提高32.1%、30.2%,峰值荷載提高27.8%、20.6%；第二榀框架填充墻雖已預(yù)開(kāi)裂(水平裂縫寬度不超過(guò)15mm),但是加固完后能恢復(fù)到原來(lái)的強(qiáng)度。在試驗(yàn)研究的基礎(chǔ)上,利用ABAQUS有限元軟件建立帶填充墻木框架模型,并基于試驗(yàn)結(jié)果對(duì)帶填充墻木框架模型進(jìn)行修正。依據(jù)有限元模型,對(duì)帶填充墻木框架在水平力作用下平面內(nèi)受力、墻體裂縫發(fā)展趨勢(shì)進(jìn)行了詳細(xì)的論述。并通過(guò)對(duì)不同影響因素的分析,包括框架跨高比、砌體平均抗壓強(qiáng)度、填充墻厚度,得到了各參數(shù)對(duì)帶填充墻木框架荷載-位移關(guān)系曲線的影響規(guī)律。此外,基于現(xiàn)有理論及試驗(yàn)結(jié)果,建立了帶填充墻木框架的恢復(fù)力模型；利用有限元變參數(shù)擬合結(jié)果,提出帶填充墻木框架三折線剛度公式,并與試驗(yàn)結(jié)果進(jìn)行比較,為帶填充墻木框架抗震彈塑性分析提供參考依據(jù)。
[Abstract]:Traditional Chinese architecture is dominated by wood structures and has lasted for thousands of years, but few of them remain intact. In addition, in the rural areas of Guangxi and Yunnan, the timber frame is used as the load-bearing structure, and the masonry as the enclosing wall house is still one of the main forms of residential housing. At present, there are more and more researches on wood frame structure at home and abroad, and some research results have been obtained, but the research on wood frame with infilled wall is still very few. In view of this, according to the code of practice of engineering in Qing Dynasty, this paper makes a dovetail tenon frame with masonry infilled wall, and studies its seismic performance and reinforcement method. In this paper, the experimental study of three wooden frames with infilled walls under low cyclic loading is first completed. The first frame is directly subjected to low cycle repeated loading. With the aim of not changing the original appearance of the members to the maximum extent (referring to the maintenance principle of the ancient buildings) and combining the failure form of the first frame with the infilled wall, the three frames adopted horizontal gray joint reinforcement, and the wall edge was strengthened with steel plate by wet method. Among them, the second one needs to be pre-cracked and then strengthened, while the third one is directly strengthened. Based on experimental research and theoretical analysis, three seismic performance indexes, such as failure mechanism, hysteretic curve, skeleton curve, bearing capacity, strength degradation, stiffness degradation, ductility and energy dissipation capacity, are obtained. The effect of this reinforcement method is evaluated. The experimental results show that the hysteretic curves of wooden frame with or without reinforcement are Z-shaped, and the failure is mainly caused by shear failure, and there is obvious shear slip, poor energy dissipation, and the wooden frame has a strong enclosing effect on the infilled wall, and the results show that the hysteretic curve of the frame is Z-shaped, and the failure is mainly caused by shear failure. When the ultimate load is reached, the strength does not decrease quickly and the ductility of the later stage is relatively large. Second, the nominal yield load of the three frames increases by 32.1and 30.2and the peak load increases by 27.8and 20.6in comparison with the first frame. Although the second frame infilled wall has been pre-cracked (the width of horizontal crack is not more than 15mm), it can be restored to the original strength after reinforcement. On the basis of the experimental research, the model of the frame with filled wall is established by using ABAQUS finite element software, and the model of the frame with filled wall is modified based on the test results. According to the finite element model, the development trend of wall cracks and the in-plane force under horizontal force are discussed in detail. Through the analysis of different influencing factors, including the ratio of span to height of frame, the average compressive strength of masonry, and the thickness of infilled wall, the influence of various parameters on load-displacement relationship curve of wooden frame with infilled wall is obtained. In addition, based on the existing theory and experimental results, the restoring force model of wooden frame with filled wall is established, and the three-fold stiffness formula of the frame with filled wall is put forward by using the finite element variable parameter fitting results, and the results are compared with the experimental results. It provides reference for seismic elastoplastic analysis of wooden frame with filled wall.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU352.11;TU366.2
[Abstract]:Traditional Chinese architecture is dominated by wood structures and has lasted for thousands of years, but few of them remain intact. In addition, in the rural areas of Guangxi and Yunnan, the timber frame is used as the load-bearing structure, and the masonry as the enclosing wall house is still one of the main forms of residential housing. At present, there are more and more researches on wood frame structure at home and abroad, and some research results have been obtained, but the research on wood frame with infilled wall is still very few. In view of this, according to the code of practice of engineering in Qing Dynasty, this paper makes a dovetail tenon frame with masonry infilled wall, and studies its seismic performance and reinforcement method. In this paper, the experimental study of three wooden frames with infilled walls under low cyclic loading is first completed. The first frame is directly subjected to low cycle repeated loading. With the aim of not changing the original appearance of the members to the maximum extent (referring to the maintenance principle of the ancient buildings) and combining the failure form of the first frame with the infilled wall, the three frames adopted horizontal gray joint reinforcement, and the wall edge was strengthened with steel plate by wet method. Among them, the second one needs to be pre-cracked and then strengthened, while the third one is directly strengthened. Based on experimental research and theoretical analysis, three seismic performance indexes, such as failure mechanism, hysteretic curve, skeleton curve, bearing capacity, strength degradation, stiffness degradation, ductility and energy dissipation capacity, are obtained. The effect of this reinforcement method is evaluated. The experimental results show that the hysteretic curves of wooden frame with or without reinforcement are Z-shaped, and the failure is mainly caused by shear failure, and there is obvious shear slip, poor energy dissipation, and the wooden frame has a strong enclosing effect on the infilled wall, and the results show that the hysteretic curve of the frame is Z-shaped, and the failure is mainly caused by shear failure. When the ultimate load is reached, the strength does not decrease quickly and the ductility of the later stage is relatively large. Second, the nominal yield load of the three frames increases by 32.1and 30.2and the peak load increases by 27.8and 20.6in comparison with the first frame. Although the second frame infilled wall has been pre-cracked (the width of horizontal crack is not more than 15mm), it can be restored to the original strength after reinforcement. On the basis of the experimental research, the model of the frame with filled wall is established by using ABAQUS finite element software, and the model of the frame with filled wall is modified based on the test results. According to the finite element model, the development trend of wall cracks and the in-plane force under horizontal force are discussed in detail. Through the analysis of different influencing factors, including the ratio of span to height of frame, the average compressive strength of masonry, and the thickness of infilled wall, the influence of various parameters on load-displacement relationship curve of wooden frame with infilled wall is obtained. In addition, based on the existing theory and experimental results, the restoring force model of wooden frame with filled wall is established, and the three-fold stiffness formula of the frame with filled wall is put forward by using the finite element variable parameter fitting results, and the results are compared with the experimental results. It provides reference for seismic elastoplastic analysis of wooden frame with filled wall.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU352.11;TU366.2
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