本文選題：砌塊砌體 + 通縫抗剪強(qiáng)度��； 參考：《哈爾濱工業(yè)大學(xué)》2016年碩士論文

【摘要】：砌體結(jié)構(gòu)在全世界擁有悠久的歷史,為人類繁衍和文化傳承作出了重要貢獻(xiàn)。但傳統(tǒng)無筋砌體的脆性特征和抗拉、抗剪強(qiáng)度不足的現(xiàn)實(shí),特別是地震作用下砌體易倒塌、延性不足的表現(xiàn),嚴(yán)重制約了砌體結(jié)構(gòu)的發(fā)展。本文以村鎮(zhèn)低層砌體房屋產(chǎn)業(yè)化項(xiàng)目為背景,依照標(biāo)準(zhǔn)試驗(yàn)方法對(duì)混凝土砌塊砌體通縫剪切作用下的基本力學(xué)性能進(jìn)行試驗(yàn)研究,為規(guī)范修訂和工程應(yīng)用提供技術(shù)支撐。課題進(jìn)行了24組共36個(gè)空心及36個(gè)灌芯混凝土砌塊砌體標(biāo)準(zhǔn)件的通縫剪切試驗(yàn),研究了砌筑砂漿強(qiáng)度、灌芯混凝土強(qiáng)度、加載方式及軸向壓力對(duì)砌體抗剪性能的影響,獲取了標(biāo)準(zhǔn)件的破壞狀態(tài)、抗剪強(qiáng)度、開裂強(qiáng)度、峰值位移等基本力學(xué)性能參數(shù),并獲得了較為理想的荷載-位移曲線。課題同時(shí)進(jìn)行了8組共15個(gè)空心及9個(gè)灌芯砌體標(biāo)準(zhǔn)件的抗壓試驗(yàn),獲得了抗壓強(qiáng)度、彈性模量、泊松比等力學(xué)性能參數(shù)。試驗(yàn)結(jié)果表明:空心砌塊砌體彈性模量的試驗(yàn)值高于現(xiàn)行規(guī)范的計(jì)算值;基于抗壓試驗(yàn)結(jié)果計(jì)算得到的砌體剪變模量與通縫剪切試驗(yàn)結(jié)果吻合較好;不同的加載方式對(duì)砌體抗剪強(qiáng)度有明顯影響;軸向壓力的施加提高了砌體的抗剪強(qiáng)度、峰值位移,改善了砌體的延性;灌芯砌體在剪切荷載作用下,砂漿層與灌芯混凝土存在協(xié)同工作的位移差,即在達(dá)到峰值荷載前砂漿層已出現(xiàn)貫通裂縫退出工作,后期抗剪強(qiáng)度主要由灌芯混凝土提供,既有灌芯砌體規(guī)范給出的抗剪強(qiáng)度公式在充分考慮砂漿強(qiáng)度貢獻(xiàn)后計(jì)算結(jié)果偏向于不安全;灌芯砌體開裂前剛度較大,開裂后則出現(xiàn)明顯的剛度衰減,其開裂強(qiáng)度與砂漿強(qiáng)度、灌芯混凝土強(qiáng)度、軸向壓力大小均呈正相關(guān)關(guān)系�；诒疚脑囼�(yàn)數(shù)據(jù)和既有研究成果的統(tǒng)計(jì)分析,擬合得到了考慮孔洞率的混凝土實(shí)心磚、多孔磚、空心砌塊的砌體抗剪強(qiáng)度的計(jì)算公式;現(xiàn)行砌體規(guī)范中剪壓復(fù)合作用下的摩擦系數(shù)取值對(duì)于低軸壓比下的空心砌塊砌體偏于保守,本文給出了建議取值;軸向壓力對(duì)灌芯砌體標(biāo)準(zhǔn)件和墻體抗剪承載力影響的差異性較大。本文基于試驗(yàn)數(shù)據(jù)的統(tǒng)計(jì)分析,建立了預(yù)壓力空心及灌芯砌體的殘余抗剪強(qiáng)度系數(shù)表達(dá)式,所擬合得到的無量綱荷載-位移曲線分段表達(dá)式與預(yù)壓力空心、灌芯及預(yù)壓力灌芯砌體通縫受剪時(shí)的變形性能吻合較好。
[Abstract]:Masonry structure has a long history in the world, and has made important contributions to human reproduction and cultural heritage. However, the brittleness of traditional unreinforced masonry and the reality of insufficient tensile strength and shear strength, especially the weak ductility and collapse of masonry subjected to earthquake, seriously restrict the development of masonry structure. Based on the industrialization project of village and town low story masonry building, the basic mechanical properties of concrete block masonry under shear action are studied according to the standard test method, which provides technical support for standard revision and engineering application. In this paper, 24 groups of 36 hollow and 36 concrete block masonry standard parts were tested, and the effects of masonry mortar strength, core concrete strength, loading mode and axial pressure on the shear properties of masonry were studied. The failure state, shear strength, cracking strength and peak displacement of the standard parts are obtained, and the ideal load-displacement curves are obtained. At the same time, eight groups of 15 hollow masonry and 9 core masonry standard parts were tested, and the mechanical properties such as compressive strength, elastic modulus and Poisson's ratio were obtained. The experimental results show that the experimental value of elastic modulus of hollow block masonry is higher than that of current code, and the shear modulus of hollow block masonry is in good agreement with the shear test result of through joint. Different loading modes have obvious influence on the shear strength of masonry, the application of axial pressure increases the shear strength and peak displacement of masonry, and improves the ductility of masonry. There is a difference in displacement between mortar layer and pouring concrete, that is, before the peak load is reached, there is a through crack exiting in the mortar layer, and the shear strength in the later stage is mainly provided by the core pouring concrete. The calculation results of the shear strength formula given by the existing code for cast-in-place masonry with full consideration of the contribution of mortar strength tend to be unsafe, and the stiffness of the masonry is larger before cracking, and there is obvious stiffness attenuation after cracking, and the cracking strength and mortar strength are obvious. The strength and axial pressure of concrete are positively correlated. Based on the experimental data of this paper and the statistical analysis of the existing research results, the formulas for calculating the shear strength of concrete solid brick, porous brick and hollow block are obtained by fitting. In the current masonry code, the friction coefficient of hollow block masonry under shear-compression combination is conservative for the hollow block masonry with low axial compression ratio, and the suggested values are given in this paper. The influence of axial pressure on the shear bearing capacity of standard masonry and wall is quite different. Based on the statistical analysis of test data, the expressions of residual shear strength coefficients of pre-pressure hollow masonry and grouted masonry are established in this paper. The dimensionless load-displacement curve segment expression and pre-pressure hollow section expression are obtained. The deformation behavior of masonry joints under shearing is in good agreement with that of prepressurized masonry.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU522.3

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