本文關(guān)鍵詞： 鋼纖維混凝土 連梁 小跨高比 受剪機(jī)理 受剪承載力　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：連梁是剪力墻結(jié)構(gòu)中的重要抗震構(gòu)件,既是剪力墻墻肢之間的傳力鏈接,又是建筑結(jié)構(gòu)抗震中的第一道防線,發(fā)揮著消耗地震能量的重要作用,其受力性能直接影響剪力墻體系的抗震性能。研究表明,按照框架結(jié)構(gòu)中“強(qiáng)剪弱彎”理念所設(shè)計(jì)的傳統(tǒng)配筋小跨高比連梁,即使配置較多數(shù)量的箍筋也難以改善其過(guò)早出現(xiàn)剪切失效的問(wèn)題,遠(yuǎn)不能滿足抗震設(shè)計(jì)的高延性、高耗能要求。為了改善小跨高比連梁的抗震性能,國(guó)內(nèi)外科研團(tuán)隊(duì)做了大量研究分析,我國(guó)現(xiàn)行《混凝土結(jié)構(gòu)設(shè)計(jì)規(guī)范》(GB50010-2010)建議采取新型配筋的形式(集中對(duì)角斜筋配筋、對(duì)角暗撐配筋)來(lái)改善其抗震受力性能,但會(huì)引起實(shí)際施工的困難,影響了該方法推廣使用。在小跨高比普通配筋混凝土連梁中加入鋼纖維以改善連梁的抗震性能,國(guó)內(nèi)外已進(jìn)行了一些試驗(yàn)研究工作,但對(duì)于小跨高比鋼纖維混凝土連梁的受力機(jī)理、破壞形態(tài)、受剪承載力計(jì)算方法等方面的研究較少。本文基于16個(gè)小跨高比普通配筋鋼纖維混凝土連梁(跨高比1.0~2.5、混凝土強(qiáng)度等級(jí)C30~C80、鋼纖維體積率0%~2.5%)在反復(fù)荷載作用下的試驗(yàn),對(duì)連梁的裂縫發(fā)展、破壞類型及鋼筋的受力特征等試驗(yàn)現(xiàn)象進(jìn)行了總結(jié),對(duì)小跨高比普通配筋鋼纖維混凝土連梁的受力機(jī)理及影響連梁變形的因素進(jìn)行了分析。并研究了跨高比、混凝土強(qiáng)度、鋼纖維體積率等因素對(duì)連梁受剪承載力的影響。在以上分析的基礎(chǔ)上提出了小跨高比普通配筋鋼纖維混凝土連梁的極限位移角計(jì)算公式,以及基于我國(guó)規(guī)范的小跨高比普通配筋鋼纖維混凝土連梁的受剪承載力計(jì)算公式和基于軟化拉壓桿模型的受剪承載力計(jì)算方法。
[Abstract]:Connecting beam is an important seismic component in shear wall structure. It is not only the link between the legs of shear wall, but also the first line of defense in earthquake resistance of building structure, which plays an important role in consuming seismic energy. The seismic behavior of shear wall system is directly affected by its mechanical performance. The study shows that the traditional reinforced beam with small span to height ratio is designed according to the idea of "strong shear and weak bending" in frame structure. Even if a large number of stirrups are deployed, it is difficult to improve the problem of premature shear failure, which is far from meeting the requirements of high ductility and high energy consumption in seismic design. Domestic and foreign scientific research teams have done a lot of research and analysis, and the current Code for concrete structure Design in China (GB50010-2010) suggests that a new type of reinforcement (concentrated diagonal diagonal reinforcement, diagonal underbrace reinforcement) should be adopted to improve its seismic behavior. However, it will cause difficulties in practical construction and affect the popularization and application of the method. Some experimental studies have been done at home and abroad to improve the seismic behavior of the connecting beams by adding steel fiber to the common reinforced concrete beams with small span height ratio. However, for the steel fiber reinforced concrete connecting beam with small span height ratio, the mechanical mechanism and failure mode are obtained. In this paper, 16 steel fiber reinforced concrete beams with small span height ratio (ratio of span to height 1.0 ~ 2.5, concrete strength grade C30 ~ C80, steel fiber volume ratio 0 ~ 2.5) are tested under repeated load. The experimental phenomena of crack development, failure type and stress characteristics of steel bars are summarized. The mechanical mechanism of steel fiber reinforced concrete continuous beam with small span height ratio and the factors influencing the deformation of the connecting beam are analyzed. On the basis of the above analysis, a formula for calculating the ultimate displacement angle of steel fiber reinforced concrete connecting beam with small span height ratio is put forward. The formulas for calculating the shear capacity of steel fiber reinforced concrete connecting beams with small span height ratio and the shear bearing capacity calculation method based on the softening tension and compression bar model are also presented in this paper.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU37

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本文編號(hào)：1536867