本文選題：框架砌體填充墻　切入點(diǎn)：干縮機(jī)理　出處：《浙江大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：在框架砌體填充墻結(jié)構(gòu)中,墻體的干縮開裂是其常見的失效模式,墻體干縮裂縫的出現(xiàn)降低了建筑的適用性、耐久性及保溫節(jié)能效果。因而分析框架砌體填充墻干縮變形產(chǎn)生的機(jī)理,研究有效的裂縫控制措施變得尤其重要。本文以現(xiàn)場調(diào)研、理論推導(dǎo)、試驗(yàn)研究、有限元模擬為技術(shù)手段主要進(jìn)行了框架砌體填充墻結(jié)構(gòu)開裂現(xiàn)場調(diào)研、墻體材料干縮機(jī)理研究、墻體材料干縮試驗(yàn)、框架砌體填充墻開裂的分離式有限元模擬、框架砌體填充墻裂縫控制措施分析、開洞框架填充墻體裂縫控制等方面的研究工作,取得了以下主要研究成果： 1.考慮界面內(nèi)外壓力差的影響推導(dǎo)了改進(jìn)的楊氏關(guān)系式,研究成果能更好的解釋浸潤角隨液面內(nèi)外壓力差變化這一自然界物理現(xiàn)象。 2.推導(dǎo)了均勻孔徑和縮減孔徑平滑毛細(xì)管結(jié)構(gòu)在水分蒸發(fā)過程中管壁徑向應(yīng)力變化計(jì)算公式,得出平滑毛細(xì)管結(jié)構(gòu)在水分蒸發(fā)過程中管壁膨脹的結(jié)論。提出了不平滑毛細(xì)管張力理論模型,推導(dǎo)了毛細(xì)水損失過程中不平滑毛細(xì)管結(jié)構(gòu)徑向變形及軸向變形計(jì)算公式。 3.建立了框架砌體填充墻結(jié)構(gòu)的分離式有限元模型,定量分析了墻體長度、框架剛度、灰縫抗拉強(qiáng)度、邊界條件、構(gòu)造措施、干縮率等因素對填充墻體不同部位裂縫出現(xiàn)及裂縫寬度的影響。 4.基于分離式有限元模型及砌塊干縮試驗(yàn)結(jié)果,定量分析了各種裂縫控制措施的裂縫控制效果,給出了基于框架填充墻體裂縫控制的墻體長度限值。
[Abstract]:In the frame masonry infilled wall structure, the dry shrinkage cracking of the wall is the common failure mode, and the appearance of the wall dry shrinkage crack reduces the applicability of the building. Therefore, it is very important to analyze the mechanism of dry-shrinkage deformation of frame masonry filled wall, and to study effective crack control measures. Finite element simulation is mainly used to investigate the crack of frame masonry filled wall structure, to study the mechanism of wall material shrinkage, to test wall material dry shrinkage, and to simulate the crack of frame masonry filled wall by separate finite element method. The research work on crack control measures of frame masonry filled wall and crack control of open-hole frame filled wall has obtained the following main research results:. 1. Considering the influence of the pressure difference inside and outside the interface, the improved Young's relation is derived. The research results can better explain the natural physical phenomenon that the infiltration angle varies with the pressure difference inside and outside the liquid surface. 2. The formulas for calculating the radial stress change of the wall of the uniform pore size and the reduced aperture smooth capillary structure during water evaporation are derived. The conclusion is drawn that the smooth capillary structure expands in the process of water evaporation, and the theoretical model of capillary tension is put forward, and the formulas for calculating radial and axial deformation of capillary structure in the process of capillary water loss are derived. 3. The separated finite element model of frame masonry infilled wall structure is established, and the wall length, frame stiffness, gray joint tensile strength, boundary conditions and construction measures are quantitatively analyzed. Effect of dry shrinkage rate on crack appearance and crack width in different parts of filled wall. 4. Based on the separated finite element model and the dry shrinkage test results of block, the crack control effect of various crack control measures is quantitatively analyzed, and the wall length limit based on crack control of frame-filled wall is given.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TU398

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